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Journal of Drainage and Irrigation Machinery Engin
 
2020 Vol.38 Issue.5
Published 2020-05-25

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2020 Vol. 38 (5): 1- [Abstract] ( 7 ) [HTML 1KB] [ PDF 10005KB] ( 90 )
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2020 Vol. 38 (5): 2- [Abstract] ( 4 ) [HTML 1KB] [ PDF 1242KB] ( 87 )
433 Noise characteristics of screw mixed-flow water-jet pump
HAN Wei,*,GUO Wei,XU Dandan,LI Rennian,CHEN Ran
Numerical calculations of unsteady flow in a screw mixed-flow water-jet pump were carried out based on DES turbulence model to investigate noise characteristics and noise generation mechanism in the pump under different operating conditions.The unsteady pressure pulsation on the surface of each flow component was extracted and used as sound sources, and the noise caused by the dipole source of each flow component was numerically calculated by using FEM and vibro-acoustic coupling method. The noise distribution in the external field was obtained.The noise distribution characteristics of every flow component were analyzed. The results show that the casing dipole source is the main contributor to external noise. The SPL issued from the impeller dipoleis the highest near the bladeinlet, and the unsteady pressure load on the blade surface and the rotor-stator interaction are the main reason for impeller noise. The SPL of the guide vane dipole source is the highest in the area with the maximum curvature and the inlet, the unsteady flow and rotor-stator interaction are the main cause for guide vane noise.
2020 Vol. 38 (5): 433-438 [Abstract] ( 10 ) [HTML 1KB] [ PDF 10333KB] ( 134 )
439 Unsteady characteristics and noise of internal flow in vertical sump centrifugal pump
WANG Chunlin,LIU Keke*,LUO Bo,FENG Yiming
The flow and sound field in a vertical sump centrifugal pump were solved by using an indirectly mixed computational method of computational fluid dynamics(CFD)software ANSYS CFX15.0 and acoustics simulation software LMS Virtual.lab to investigate unsteady characteristics and noise pattern of the pump. In this method, firstly, the unsteady pressure pulsations in time domain at a few monitoring points in the flow field were obtained by solving the flow field, thereby the characteristics of these unsteady pressure pulsationsin frequency domain were determined. Based on the acoustic boundary element method, the internal acoustic field noise of the volute and blade dipoles was solved, the sound pressure level distribution on the surface of boundary elements and the sound pressure frequency curve at typical field points were obtained. The results showed that the interaction between sweeping blades and the volute tongue produces a larger pressure pulsation, and the noise near the tongue is the main sound source for the flow borne noise.The sound pressure level reaches the maximum at blade passing frequency and its harmonic frequencies.With increasing frequency, all the maximum sound pressure levels decrease. The results presented in this paper can provide a certain theoretical basis for subsequent analyses of noise reduction issued by vertical sump centrifugal pumps.
2020 Vol. 38 (5): 439-444 [Abstract] ( 4 ) [HTML 1KB] [ PDF 2915KB] ( 134 )
445 Effects of cavitating flow on induced pressure fluctuation near cutwaters in double-volute centrifugal pump
YANG Jingjiang*,LI Xianjun,PAN Zhongyong,HE Song
Numerical simulation was applied to analyze effects of cavitating flow on pressure fluctution near the cutwaters in a double-volute centrifugal pump to investigate the mechansems for pump vibration and noise induced by the flow.The SST k-ω turbulence model and Zwart-Gerber-Belamri cavitation model were selected to carry out unsteady simulations of non-cavitating flow and cavitating flow in the pump under design condition. The numerical results show that the SST k-ω turbulence mo-del can accurately predict the pump perfromance. Vapour bubbles occur initlally on the blade suction side near the blade leading edge and impeller hub.With the decrease of NPSHA(net positive suction head available), the vapour bubbles develop along the blade suction side towards the blade outlet and impeller shroud.The vapour bubbles uneven development in different flow passages intensifies the unstablility of the flow in the impeller.Comparing the flow patterns ofcavitation and non-cavitation flows in one revolution of the impeller, the pressure fluctuation in every monitoring point near two cutwaters domonstrates an obvious periodicity.The dominant frequency of the pressure fluctuation near the inlet of the deflector is double the blade passing frequency(BPF)under non-cavitation condition.The dominant frequency of the pressure flucutation at the other monitoring points is BPF under both cavitation and non-cavitation conditions.The amplitude of the pressure fluctuation near all the monitoring points increases significantly under cavitation condition.
2020 Vol. 38 (5): 445-450 [Abstract] ( 18 ) [HTML 1KB] [ PDF 2310KB] ( 134 )
451 Influence of volute tilted outlet on performance of mixed-flow pump as turbine
YANG Sunsheng*,DAI Tao,CHEN Zhen,SHAO Ke,WANG Kai
Two volutes of a mixed-flow pump with specific speed of 288 were designed respectively with horizontal and tilted inlets to reveal their influence on the performance and improve the efficiency when working as turbine, i.e. pump as turbine(PAT).In the design, the volute inlet(outlet for PAT)orientation was rotated 26° clockwise while the rest geometrical parameters remained unchanged. In this study, experimental and numerical simulation methods have been adopted.After the volute inlet is til-ted, the streamlines in the impeller is more evenly distributed, and the secondary flow and vortex phenomena are significantly suppressed compared with the volute with horizontal inlet.Under the design flow condition(Q=120 m3/h), compared with the PAT with horizontal outlet(inlet for pump), the shaft power, head and efficiency of the PAT with tilted outletare increase by 17.64%, 10.41% and 5.2%, respectively.After the volute outlet is tilted in the PAT, the hydraulic loss in both the impeller and the draft tube is reduced, even though the loss in the volute rises slightly,the total hydraulic loss is declined. The experimental results are consistent with the data of numerical simulation, leading to a validated accuracy of numerical simulation.This study can enrich design methods of PAT and can providea reference for hydraulic design of mixed-flow pump used as PAT.
2020 Vol. 38 (5): 451-456 [Abstract] ( 9 ) [HTML 1KB] [ PDF 3970KB] ( 136 )
457 Numerical simulation of cavitating jet in dual chamber self-excited oscillating pulse nozzle
QI Mei*,WANG Lifu,CHEN Qingguang,ZHAO Jianlong,JU Yongheng,FU Qiqi
Based on the single chamber self-oscillating pulse nozzle, a dual chamber self-oscillating pulse nozzle was designed by adding an additional singlechamber nozzle in series. The cavitating jet flow in the dual chamber nozzle was simulated in Fluent in terms of the RNG k-ε turbulence model to clarify effects of the nozzle geometrical parameters on the cavitating jet flow field.The influences of Reynolds number, chamber length ratio and diameter ratio on the cavitating jet were analyzed with the liquid vo-lume fraction in the chamber and the velocity at the nozzle exit.The numerical results show that when the Reynolds number rises to 4.31×105 from 2.98×105, the cavitation extent in the chamber increases first and then decreases, and the corresponding liquid volume fraction first decreases and then increases.When the chamber length ratio is 0.67, the airbag in the chamber presents a regular shape and is with symmetrical vortex ring structure, which facilitates the occurrence of pulse cavitating jets.When the chamber diameter ratio is 1.20, both the vortex ring structure and the airbag in the chamber are symmetrical and promote the onset of pulse cavitating jets, but also the velocity at the nozzle exit is more uniform and higher.
2020 Vol. 38 (5): 457-461 [Abstract] ( 12 ) [HTML 1KB] [ PDF 2531KB] ( 166 )
462 Numerical prediction of unsteady cavitating flow characteristics in turbo-pump inducer for liquid rocket engine
KANG Yazhuo,ZHAO Xing′an,WU Qin*,HUANG Biao,WANG Guoyu
To analyze unsteady cavitating flow and its static pressure pulsation characteristics in the inducer of turbo-pump, the cavitation characteristics of an inducer were numerically predicted based on the turbulence model with rotation and streamline curvature corrections and compared with the experimental results. The maximum error of head coefficient between prediction and measurement is 3.6%, suggesting excellent agreement with the experimental results. The numerical results show that cavitating bubbles are mainly distributed at the leading edge of blade near the tip in the inducer under typical operating conditions and the cavity pattern varies from one blade to another continuously with time.During one rotating cycle, the vortex cavitation rotates with the inducer in the same direction at a far less rotating speed than that of inducer. The analysis of pressure fluctuation characteristics shows that the inlet pressure fluctuation in the inducer is mainly affected by blade rotation and the power spectral density distribution exhibits significant peaks at blade passing frequency. The pressure at the exitof inducer is higher but its fluctuation amplitude is relatively small.
2020 Vol. 38 (5): 462-468 [Abstract] ( 10 ) [HTML 1KB] [ PDF 3590KB] ( 175 )
469 Effects of water baffle on self-priming performance of ejecting self-priming centrifugal pump
ZHU Rui,WANG Yang*,WANG Qun,TANG Haitao,YU Haoqian
An ejecting self-priming centrifugal pump of type UJM75-2 with additional water baffle was selected as test model to improve the pump self-priming performance.The influencing rule of the added water baffle at the back of the diffuser on gas phase flow capacity in the pump chamber was analyzed by using a combined experimental validation and numerical simulation method. Furthermore, the mechanism that the water baffle influences ejecting self-priming pump performance was studied based on the analytical results.The results indicate that the outflow of the mixed fluid is affected by the relative position between the outlet holes above the baffle and the ribs at the back of the diffuser, and the optimal installation position existes. When the liquid flowes to the pump chamber from the outlet holes, it has a scouring effect at the pump outlet, leading to an insufficient gas-liquid separation, and in consequence, a part of the liquid enteres the pump discharge pipe to block the gas to be discharged.When the angle between the symmetric center line of the outlet holes and the center line of the pump outlet is 90°, the experimental self-priming height is up to 8.5 m and the self-priming time is 3 min. The pump with the water baffle shows a little difference in performance in comparison with that without the baffle. Thus, the baffle can improve self-priming performance under stable operational conditions.
2020 Vol. 38 (5): 469-475 [Abstract] ( 14 ) [HTML 1KB] [ PDF 2147KB] ( 135 )
476 Volume of fluid model-based flow pattern in intake of pump station and combined rectification scheme
YING Jiawei,YU Xiaodong*,HE Wei,ZHANG Jian
A three-dimensional fluid domain computational model of the intake in a large-scale pump station was established based on volume of fluid(VOF)model in computational fluid dynamics method to analyze the flow pattern in the intake. The grid size independence was checked, then the flow pattern in the intake was simulated under design condition, and reverse flows were found in both sides of the intake. The reason for the reverse flows was analyzed. Based on this, flow patterns were calculated in the intakes with single vertical column, single bottom sill and both of them, and the advantages and disadvantages of these schemes were compared, eventually, the flow pattern variation characteristics were identified after these rectification measures were implemented. It was found that the rectification effect of the combined rectification scheme of vertical column and sill was more effective than that of the rest measures, and the water velocity distribution in the intake is more uniform in the former. Additionally, the combined rectification schemes with variable spacing between vertical column and sill were simulated, and the flow pattern and velocity distribution uniformity were analyzed and compared among different schemes. The results showed that when the bottom sill was placed in the position with 80% of the distance from the vertical column to the pump discharge pipe, the flow in the intake was more uniform under design condition. This result can provide a reference for hydraulic optimization measures of similar pump intakes.
2020 Vol. 38 (5): 476-480 [Abstract] ( 12 ) [HTML 1KB] [ PDF 2784KB] ( 170 )
481 Orthogonal design of experiment-based evaluation method for rough strip energy dissipators
LI Fanqi,MU Zhenwei*,SUN Dexu,JIA Pingyang
Based on the research on the 635 spillway rectification project in Xinjiang, a 6-factor and 3-level orthogonal design of experiment is performed for the spillway with rough strip energy dissipator(R-SED)by using orthogonal design principle, and the instantaneous stream velocity and water depth in 18 typical cross-sections are obtained. A model for mass discrete coefficient Cm is established by means of discrete element method for bend, and a range analysis is performed on the experimental results in terms of energy dissipation rate η. To generalize the evaluation method for diversion effect, two dimensionless factors Rd and Rs, are defined and the correlation between layout parameters and engineering parameters is analyzed further. The results show that the mass dispersion coefficient Cm can objectively reflect the diversion effect of R-SED. As far as the influence of the index Cm is concerned, the influence of engineering parameters on the index is dominant compared with the layout parameters. Naturally, the determination of engineering parameters should take full account of flow pattern in practical engineering. Since both Rd and Rs are all dimensionless, the evaluation method based on them is universal for diversion effect of general spillway rectification projects.
2020 Vol. 38 (5): 481-487 [Abstract] ( 10 ) [HTML 1KB] [ PDF 2178KB] ( 126 )
488 Influence of valve small opening on pulsating pressure characteristics of pipe flow downstream sudden expansion section
PAN Yue,ZHANG Kai*
In order to analyze the effect of valve opening on pulsating characteristics of pressure downstream and improve the stability of pipe flow and transport efficiency, experiments were performed to measure the fluctuating pressure characteristics in downstream flow of the pipe with sudden expansion section at different valve openings. In the experiments, tap water was the working fluid, the valve opening and the length between the valve and the sudden expansion section were varied, and the amplitude of pulsating pressure at different positions along the pipe downstream the sudden expansion section was measured. Furthermore, the influence of different valve openings on the pulsating pressure characteristics of variable cross-section pipe flow was analyzed. It is found that the pulsating pressure curve of the downstream pipe with variable cross section has random but steady characteristics. Using a valve to adjust flow rate can lengthen the pulsating pressure period at each point. The valve can cause an about 50 Hz pulsating pressure downstream the variable cross-section pipe, and the amplitude of the pressure is positively correlated with valve opening. As the distance to the sudden expansion section increases, the standard deviation of fluid pressure first rises and then decreases. As the valve opening increases, the frequency domain of the pulsating pressure energy is widened gradually, and the turbulent intensity of the flow is intensified step by step. Thus, the length of the pressure recovery behind the sudden expansion section becomes longer.
2020 Vol. 38 (5): 488-493 [Abstract] ( 13 ) [HTML 1KB] [ PDF 2636KB] ( 153 )
494 Mechanical analysis of apical anchors for human heart
ZHANG Ran,CHEN Si,JING Teng,ZHOU Bingjing,HE Zhaoming*
A novel six-teeth nitinol anchor, which is used for heart apical fixation in regurgitation repairing system of mitral and tricuspid valves, was designed, and the mechanical behavior of the anchor was studied numerically. According to cardiac anatomical data, the shape and controllable geometric parameters were defined for the anchor design. 3D models of the different anchor designs were built in SolidWorks, anchor sheathing process was simulated by using FEA calculations for 23 anchor designs in Abaqus. The maximum sheathing force, von Mises strain, and sheathing trajectory influencing factors were analyzed during the sheathing process. A prototype of an anchor design was fabricated and compared with the simulation results. In conclusion, the sheath length and angle as well as the tooth width have the most significant effect on the maximum stress and strain, and a short sheath length or a small angle or a narrow tooth width can lower the maximum stress and strain levels effectively. The thickness, curvature radius and tooth width are decisive in the sheathing force, while the root length and angle have a little effect on the force. The axial penetration depth is mainly determined by controlling the sheath length and angle, but the radial penetration depth is done by the curvature radius. The study could provide some reference for the design of cardiac interventional products of apical fixation.
2020 Vol. 38 (5): 494-499 [Abstract] ( 11 ) [HTML 1KB] [ PDF 2488KB] ( 136 )
500 Effects of controlled irrigation and oxygenation on physiological and biochemical characteristics and water use efficiency of super rice
HU Deyong*,LIAO Jiancheng,CHEN Zhe,DING Xin,LUO Dongcheng,YOU Junsong
A combination method of controlled irrigation and aerobic irrigation was adopted in field experiments of super rice to improve its water use efficiency. The super rice of brand Lingliangyou 268 served as study object, and four experimental treatments were designed, namely controlled irrigation and mechanical aeration(JX), controlled irrigation and ultra-microbubble aeration(WP), controlled irrigation(CK), flooding irrigation(YS)to explore effects of aeration on physiological and biochemical characteristics and yield of the rice during its growth periods after turning green under controlled irrigation conditions. The results showed that the content of chlorophyll in leaves was not significantly different in the early growth stages(tillering stage, jointing booting stage, heading and flowering stage), but it was increased by 38.2% in maximum in the late growth stage(milk stage). The net photosynthetic rate, transpiration rate and stomata conductance were significantly improved, specially, in the early stages increased by 44.9%, 18.5%, and 25.0%, respectively, but 14.3%, 11.5%, and 22.2% in the late stage. Compared with the YS group, the root vigor rose by 44.6% in maximum, but 11.5% against the CK group in heading and flowering stages. At the same time, the soil redox potential was regularly monitored. The soil was basically in oxidation state in various growth periods after aerobic treatment under controlled irrigation conditions. Under flooding irrigation, however, the soil is essentially in reduced state in the whole growth period. The water use efficiency was improved significantly in three groups under controlled irrigation conditions, especially, the maximum water saving was up to 18.5% during the entire growth period under controlled irrigation condition with oxygenation.
2020 Vol. 38 (5): 500-505 [Abstract] ( 13 ) [HTML 1KB] [ PDF 1521KB] ( 175 )
506 Influence of water quality on element leaching of sandy compacted gravel under freeze-thaw cycle conditions
LI Wangcheng,*,ZHAO Yan,WANG Xia,WANG Shuangtao,LI Chen,WANG Xing,DONG Yaping
In order to understand the effect of water quality treatments on leaching and release of elements in freeze-thaw cycles in sandy compacted land in Ningxia region, the element content of brac-kish water in Zhongwei city of Ningxia was measured by using inductively coupled plasma emission spectrometer and inductively coupled plasma mass spectrometer. The influence of different water quality on the leaching and release of elements was explored by freeze-thaw cycle tests. The results show that when the water quality remains the same, the total amount of element released in leaching solutions increases with increasing number of freeze-thaw cycles. When the number of freeze-thaw cycles is kept constant, the total amount of element released in distilled water treatment is larger than that in brackish water treatment, and brackish water inhibits the element release to a certain extent under freeze-thaw cycle conditions.
2020 Vol. 38 (5): 506-510 [Abstract] ( 12 ) [HTML 1KB] [ PDF 2068KB] ( 133 )
511 Effects of film-mulched ditch-on-ridge irrigation on soil moisture distribution and economic benefit of greenhouse tomato
ZHAN Han,BAI Qingjun,DONG Zhengyang,YUAN Ying,ZHANG Mingzhi,YUAN Ningning
In order to find out effects of film-mulched ditch-on-ridge irrigation on soil moisture distribution and economic benefit, greenhouse tomato was used as experimental plant. Using a completely randomized experimental design method, the soil moisture distribution was observed by time domain reflectometry(TDR). The effect of irrigation methods, such as film-mulched ditch-on-ridge irrigation and conventional furrow irrigation, on the economic benefit of greenhouse tomato was investigated. The results show that the soil moisture profile in the back of ridge reaches the maximum later than that in the furrow irrigation, and the profile observation point at the back is 184 h after the irrigation. The water content is increased by 0.63% compared with the conventional furrow irrigation. For the film-mulched ditch-on-ridge irrigation, the maximum IWUE of greenhouse tomato reaches 34.925 kg/(hm2·mm-1)under water shortage irrigation, both yield and fruit yield are higher, the combined net income is the highest, and the economic benefit is maximum.
2020 Vol. 38 (5): 511-516 [Abstract] ( 10 ) [HTML 1KB] [ PDF 1657KB] ( 111 )
517 Study on drip irrigation anti-clogging experiment of Yellow River water treated with inorganic adsorbent
YANG Shaodong,QU Zhongyi,*,ZHANG Weifeng,LI Zhe,DING Yanhong,JIA Yonglin,FAN Qing
To solve the sediment deposition problem when the Yellow River water was used in drip irrigation, three water mixtures with high, medium and low solid concentrations were blended by using sediment harvested from the Yellow River. Then, these water mixtures were filtered in a sediment separation device by using an inorganic adsorbent of brand “Water Dream” to carry out clogging simulation tests. The variation state of water quality was monitored and the anti-clogging tests on drip irrigation emitters were conducted. The variation of flow rate along two drip irrigation tapes, the uniformity and the relative average flow rate in the drip irrigation system were observed. The results showed that after the water mixtures were treated by the inorganic adsorbent, the water turbidity and various pollutant indexes at different sediment concentrations were improved, especially, the total nitrogen, total phosphorus, COD, BOD and turbidity were decreased by 23.9%, 40.3%, 47%, 38.3% and 97.8%. respectively. Simulation field drip irrigation was performed by employing 8 irrigation trials. According to the changes in irrigation uniformity and average irrigation flow rate in two kinds of drip irrigation tape tested, it was known that the inlaid patch drip irrigation tape for large flow rate should be adopted in practical applications.
2020 Vol. 38 (5): 517-522 [Abstract] ( 13 ) [HTML 1KB] [ PDF 1732KB] ( 123 )
523 Experimental study on soil moisture lower limit-based drip irrigation schedule for Lycium barbarum in Ningxia arid area
XU Ligang*,WANG Huaibo,BAO Ziyun,LI Jinze
Considering Ningqi No.7 Lycium barbarum as study object, field experiments were carried out in Tongxin county of Ningxia during 2016—2017. In the experiments, there were four critical control irrigation stages and three control irrigation levels, resulting in eight treatments totally. The root soil moisture, leaf photosynthetic physiological indexes, yield and quality of Lycium barbarum were investigated in different growth stages and lower limits of soil moisture. The water consumption and water use efficiency were analyzed and a drip irrigation schedule for Lycium barbarum in Ningxia arid area was proposed based on the lower limits of soil moisture. The results showed that the soil moisture in the 20-60 cm soil layer was the highest in the root area of Lycium barbarum in different treatments. The leaf stomatal conductance was increased with increasing lower limit of soil moisture, and the higher the soil moisture lower limit and the bigger the transpiration rate, but the leaf water use efficiency was opposite. The water consumption rose with increasing lower limit of soil moisture in the growth stage in 2016—2017, and their increase rates were 10.8% and 12.8%, respectively. The average water consumption was 386.6-463.2 mm and it was the largest in summer fruiting period with statistics significance, therefore, this is the critical stage. The maximum yields were 2 208.15 kg/hm2 and 2 571.30 kg/hm2 in 2016—2017, respectively, and the water use efficiency was the highest at 0.39 kg/m3. The influence of soil moisture on quality of Lycium barbarum is not statistically significant. The content of glutinous polysaccharide was relatively high in lower moisture treatment. The whole growth stage was divided into six irrigation stages, among which the irrigation quota in sprout stage was 375 m3/hm2(spring water). The lower limit of soil moisture is 50%θff is field moisture capacity)in spring growth stage, 65%θf in flowering stage, 65%θf in summer fruiting stage, 55%θf in autumn fruiting stage, and the upper limit was 95%θf. The irrigation quota was 450 m3/hm2 during winter dormancy. Those outcomes will provide a technical support for scientific irrigation and planting management of Lycium barbarum in arid areas.
2020 Vol. 38 (5): 523-529 [Abstract] ( 13 ) [HTML 1KB] [ PDF 2026KB] ( 89 )
530 Analysis of influence of various factors on power of β-Stirling engine
YANG Xiaohong,*,HAN Lei,TIAN Rui,WANG Liping
The influence of various factors on the power of β-Stirling engine was studied. Based on Schmidt analysis, the power of a β-Stirling engine was calculated theoretically. Four factors affecting the performance of Stirling engine, namely, piston phase angle, stroke volume ratio, dead vo-lume ratio and temperature ratio. Matlab programming was used to draw 3D surfaces of the results, and the effect of coupling of two factors on engine power was analyzed, eventually the interaction between factors was obtained. The results show that there is an optimum piston phase angle, which is decreased with increase of volume ratio, but rises with increase of temperature ratio. The larger the stroke volume ratio, the greater the power. The smaller the dead volume ratio, the greater the influence of stroke vo-lume ratio on the power. The optimal stroke volume ratio is ranged in 0.5-1.5. An increase in dead vo-lume ratio results in a decrease in power and the dead volume ratio should be less than 1.5. An increase in stroke volume ratio amplifies the extent of this decline. However, an increase in temperature ratio suppresses the extent of the decline. The power decreases with increase of temperature ratio and the optimum temperature ratio should be less than 0.5. Finally, the effect and significance of four factors are analyzed by employing orthogonal experimental design, and the temperature ratio and stroke volume ratio are relatively significant in the results.
2020 Vol. 38 (5): 530-535 [Abstract] ( 12 ) [HTML 1KB] [ PDF 2197KB] ( 214 )
536 Real-time feedback control technology for precise furrow irrigation
WU Caili,*,XU Di,BAI Meijian,LI Yinong,
A real-time feedback control system for precise furrow irrigation was constructed by taking gate time as a control variable in the paper. In the system, real-time data acquisition and transmission equipment for irrigation information served as the support conditions, computer processing system was the core foundation, and irrigation water flow control device was the application conditions. Among them, the real-time data acquisition and transmission equipment included the team self-developed water level detecting device and wireless receiving information management device. Especially, a few difficult problems, such as easily missed irrigation information test, short receiving distance and field power supply, were solved with IP addressing, relay jump of wireless communication module, circuit optimization and internet technology. Based on the real-time irrigation information, the computer processing system can estimate the soil property parameters and predict the irrigation process, but also decide the optimal control scheme according to an irrigation control target. Finally, the irrigation water flow control equipment was tested in field by controlling gate valve opening and closing in Beijing, Hebei and Xinjiang regions, etc. The results show that the precise real-time feedback control system proposed has very important theoretical and practical significance to strengthen the controllability of the furrow irrigation process, improve the irrigation efficiency of the irrigation, and promote the transition of irrigated agriculture from empirical extensive management to computer-controlled intensive management to realize the sustainable development.
2020 Vol. 38 (5): 536-540 [Abstract] ( 9 ) [HTML 1KB] [ PDF 2035KB] ( 141 )
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