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Journal of Drainage and Irrigation Machinery Engin
 
2020 Vol.38 Issue.6
Published 2020-06-25

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2020 Vol. 38 (6): 1- [Abstract] ( 31 ) [HTML 1KB] [ PDF 2364KB] ( 359 )
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2020 Vol. 38 (6): 2- [Abstract] ( 20 ) [HTML 1KB] [ PDF 775KB] ( 415 )
541 Deep-sea mining pump wear prediction using two-phase flow numerical simulation
LIU Shaojun,WEN Hao,ZOU Weisheng,HU Xiaozhou*,DONG Zhe
In view of the wear problem of deep-sea mining pump, Euler-Lagrange two-phase flow model was applied to simulate the solid-liquid two-phase turbulent flow field inside the pump, and the accuracy of simulation model was verified by comparison with the experimental results. A professional rotary mechanical modeling software BladeGen was employed to generate the models of impellers and guide vanes. Based on the fluid analysis software CFX, Finnie wear model was utilized to predict the wear rate of the hydraulic components of deep-sea mining pump at different flow rates, rotational speeds and particle volume fractions, and the particle trajectory distribution in the pump flow field was obtained. The results show that the wear rate of the impeller increases with the increase of the flow rate, however, the wear rate of guide vanes does not vary significantly. This is a distinct part between vane type slurry pump and volute type slurry pump. As the rotation speed or particle volume fraction increases, the wear rate of impeller and guide vanes rapidly increases. The wear rate of the impeller is higher than that of the guide vane, and the pressure surface of the blade is most seriously worn. Accor-ding to the design principle of equal life, impeller should be made by more wear-resistant material.
2020 Vol. 38 (6): 541-546 [Abstract] ( 56 ) [HTML 1KB] [ PDF 7393KB] ( 420 )
547 Experimental study on cavitation cloud evolution law of cavitation jet of convergent-divergent nozzle
LI Wei*,ZHANG Wenquan,SHI Weidong,YANG Yongfei,CAO Weidong
To reveal the characteristics of cavitation jet flow field under different pump pressures and analyze the effect of inlet pressure on the evolvement law of cavitation could, an experiment on high-pressure cavitation jet of convergent-divergent nozzle was carried out by means of high-speed photography. The results show that the cavitation cloud of the submerged cavitation jet evolves periodically, which contains four stages in one cycle, namely initiation, development, shedding and collapse. The area, concentration and width of the cavity reach the highest values at the moment of shedding. With the increase of the pressure, the velocity of the jet center increases and velocity gradient in jet boundary la-yer increases, which intensifies the shearing action between the high-velocity flow and the steady li-quid, and thus leads to the increase of the cavitation dimension. Meanwhile, With the increase of the pressure, the shearing process leads to increasing turbulent kinetic energy, the contour profile of the cavitation cloud becomes vague, which increases the shedding frequency of the cavity. The results provide theoretical significance and guidance value for application of cavitation jet in the field of metal surface treatment, petroleum drilling and rock breaking.
2020 Vol. 38 (6): 547-552 [Abstract] ( 42 ) [HTML 1KB] [ PDF 3240KB] ( 546 )
553 Influence of thermodynamic effects on cloud cavitation dynamics characteristics around 3D hydrofoil
TANG Qinghong,YU An,ZHENG Yuan*,ZHAO Mengshang,XU Zhe,TANG Wei
In order to investigate the thermodynamic effects on cloud cavitation dynamic characteristics, the accordance of numerical simulation with experiment was first validated, and then the thermodyna-mic effects on cavitation were investigated from aspects of temperature field, bubble radius and local cavitation number at different water temperatures. Based on the physical model of experiments, the simulation model was established, and the thermodynamic cavitation model and density corrected model(DCM)were applied to this cloud cavitation simulation around a hydrofoil with an angle attack of 8°. The results indicate that the calculated cavity structure coincides with the experimental results. Evaporation cooling leads to temperature drop inside the cavity, then saturation pressure decreases which suppresses the development of cavitation, and finally the attached cavity regions become smaller and thinner. Moreover, bubble radius decreases with the increase of free-stream temperature, which results in strong diffusion of bubbles and mistier cavity regions. Local cavitation number can directly reflect the effects of flow field temperature variation on the development stage of cavitation since the fluid physical properties change with temperatures.
2020 Vol. 38 (6): 553-559 [Abstract] ( 51 ) [HTML 1KB] [ PDF 9863KB] ( 467 )
560 Effect of thrust pad geometric parameters on characteristics of thrust bearing oil system for nuclear coolant pump
TANG Qianhao,LAI Xide*,CHEN Xiaoming,LI Ping,DU Jiang,CHENG Hai
To solve the problem that the temperature of the upper thrust pad is too high in the test process of the bidirectional thrust bearing of a nuclear coolant pump, without changing the structure size of the oil system and the thrust bearing, and the number of thrust pad, design grooves with diffe-rent sizes were designed on the side of the thrust pads to control the flow. An improved thrust pad was designed through multi-scheme optimization in order to solve the problem of high temperature of the upper thrust pad by optimizing the geometric parameters of the thrust pad. Based on the numerical simulation method, the flow field of the oil system was deeply analyzed. By comparing the flow field of two kinds of thrust pads, the influence of geometric parameters of the thrust pad on the flow and cooling performance of the bidirectional thrust bearing oil system was analyzed qualitatively, the influence of dynamic and cooling performance shows that under the same operation conditions the optimized thrust pad greatly reduces the oil flow hedging and blockage, eliminates the unreasonable backflow, and increases the cold oil flow into the channel. Thus the cooling effect of the oil system is improved, and the temperature of the upper thrust pad is obviously reduced, which meets the design requirements. And it is proved that the geometric parameters of thrust pad are the important factors affecting the characteristics of thrust bearing oil system. The results can provide a reference for exploring the influence of thrust pad geometry parameters on oil system characteristics and optimization of thrust pad geometry parameters similar to bearing system.
2020 Vol. 38 (6): 560-565 [Abstract] ( 38 ) [HTML 1KB] [ PDF 4167KB] ( 579 )
566 Optimization design of water jet propulsion pump blade based on improved PSO algorithm
HAO Zongrui*,LI Chao,REN Wanlong,WANG Yue,HUA Zhili,LIU Gang
In order to improve the open water performance of water jet propulsion pump, the improved particle swarm optimization(PSO)algorithm was used to optimize its rotor blades. The optimization algorithm combined with numerical simulation technology was applied to optimize hydrofoil NACA-6510 with the lift-drag ratio and pressure distribution as optimization objectives. The results show that the lift-drag ratio increases by 14.7% and the minimum value of hydrofoil pressure distribution increases by 20% after optimization, effectively inhibiting the occurrence of cavitation. The optimized hydrofoil was applied to the hydraulic model design of water jet propulsion pump without hydrofoil position changed, and the performance was analyzed. The thrust and efficiency of the pump increases by 2.55% and 6.38% respectively. Combined with the analysis of torque coefficient and shaft power, the performance of water jet propulsion pump is improved obviously after optimization. The pressure pulsation of the optimized blade in the flow field is significantly improved, and the minimum pressure value of the blade is increased, which delays the occurrence of cavitation. Based on the blade load distribution, and the frequency distribution of thrust and torque, it is found that the blade optimization does not change the fundamental frequency, and the amplitude change corresponds to the external characteristic parameters of the water jet propulsion pump. From all aspects, the performance of the optimized water jet propulsion pump is effectively improved.
2020 Vol. 38 (6): 566-570 [Abstract] ( 44 ) [HTML 1KB] [ PDF 2985KB] ( 440 )
571 Hydraulic and structural characteristics of cylindrical hub type circulating water pump
JIAO Haifeng,TANG Fangping,SHI Wei,SHI Lijian*,ZHANG Yunjing
In order to study the hydraulic and structural performance of circulating water pump, CFD software was used to carry out numerical simulation and structural calculation of circulating water pump device. First, the hydraulic performances were compared between the circulating water pump and traditional axial-flow pump device, and then the reliability of the data was verified through model tests. The results show that the change of the hub type mainly affects the hydraulic performance of the impeller chamber but it has little effect on the vane, or the inlet and outlet water passages. Under the design condition, the circulating water pump device has a head of 3.35 m, an efficiency of 86.29% and a maximum efficiency of 86.69% while the traditional axial-flow pump device has a head of 3.19 m, an efficiency of 85.63% and a maximum efficiency of 85.74%. The difference of head between two pump devices under the design condition is about 0.16 m, and the difference in efficiency is about 0.66%. The difference of hydraulic performance is obvious. The head of circulating water pump device is higher than that of the traditional axial-flow pump device under all working conditions. The efficiency of the circulating water pump device is significantly higher than that of the axial-flow pump device at the design flow rate and large flow rate. The difference of efficiency is small at small flow rates. The maximum stress of the circulating pump impeller occurs in the area where the impeller inlet hub is connected to the impeller. The maximum displacement occurs in the area where the inlet vane is near the rim. As the flow rate increases, the maximum stress and maximum displacement of the blade gradually decrease. The research results provide a reference for the design and development of the impeller of axial-flow pump.
2020 Vol. 38 (6): 571-576 [Abstract] ( 34 ) [HTML 1KB] [ PDF 19136KB] ( 310 )
577 Comprehensive evaluation of service status of cascade pumping station based on cloud model
XU Cundong,ZHU Xinglin*,ZHANG Rui,Tian Junjiao,Wang Yan,WANG Rongrong
In order to accurately and objectively quantify the service status of the high-lift cascade pumping station system, the Ningxia Yanhuan fixed-height cascade pumping station system was taken as the research object. The ambiguity factors were quantified through the cloud theoretical model and the indicator state was quantitatively described based on the cloud model digital characteristics was quantitativelg described, and an index system for evaluating the service status of the pumping station. The standard cloud model of the comment layer and the cloud model of the membership level of the element layer were constructed. At the same time, the queuing theory was used to solve the index weights, and the comprehensive evaluation of the service status of the pumping station system was rea-lized. The results show that the comprehensive evaluation clouds of the service status of the pumping station system before and after renovation are Cb(0.626 4, 0.061 4, 0.016 8)and Ca(0.842 1, 0.100 5, 0.012 6). In the ″good(V4)″ state, the service status level after the transformation is in the ″good(V5)″ state, verifying that the evaluation results are in line with the actual situation. It can be seen that this method can provide a useful reference for the evaluation of the service status of the cascade pumping station system or the prediction of similar systems.
2020 Vol. 38 (6): 577-582 [Abstract] ( 33 ) [HTML 1KB] [ PDF 1766KB] ( 423 )
583 Dam safety visual monitoring system based on BIM technology and B/S architecture
JIE DEERBIEKE·MA Diniyeti,NIU Zhiwei,*,LI Peicong,ZHANG Yu,KUAI Pengcheng,LI Jiatian
In order to realize the overall structure of the dam, the layout of the safety monitoring points and the visual display function of the monitoring results, and to be able to timely and accurately grasp the operation status and abnormal conditions of the dam, the Kamchay RCC gravity dam was taken for example. The existing problems of the dam safety monitoring system were analyzed and solved in depth, and on this basis, the visual dam safety monitoring system was proposed. The model family of dam main structures and monitoring points was established using mainstream BIM software such as Revit, Dynamo, Civil3D, etc. A three-dimensional visual BIM model of the dam and the monitoring system was integrated. Using modern information technologies such as the lightweight technology of the BIMFACE platform, PHP scripting language and MySQL database, the Gan Zai Dam safety visualization system was developed based on the B / S architecture, and the lightweight display of the BIM model on the Web was realized. Through the client browser, it was possible to visually view the dam structure, the monitoring instrument information and the time-history curve changes of monitoring points in the three-dimensional model. Through the application of this system, the visual management level of safety monitoring during the dam operation was greatly improved. At the same time, the modern methods and ideas were proposed for the traditional dam safety monitoring system.
2020 Vol. 38 (6): 583-588 [Abstract] ( 95 ) [HTML 1KB] [ PDF 2878KB] ( 717 )
589 Effect of different parameters on hydrodynamic characteristics of double-floating-body wave energy converter
JI Renwei,SHENG Qihu*,WANG Shuqi,ZHANG Yuquan,ZHANG Liang
Taking the double-floating-body wave energy converter as the research object, a set of calculation method based on ANSYS-AQWA software was proposed to simulate the oscillating motion of double-floating-body wave energy converter. Fortran′s secondary development was used to consider the influence of linear PTO damping. The numerical results of the motion were compared with the experimental results of NREL(National Renewable Energy Laboratory). The effects of different parameters(wave parameters, power generation device parameters and PTO parameters)on the hydrodynamic characteristics of the double-floating-body wave energy converter were studied in detail. The results show that in terms of wave parameters, there is an optimal wave period, which makes the generating power of wave energy converter reach the maximum, and the increase of wave height is conducive to the capture of wave energy. In terms of power device parameters, there are optimal values for the draft and diameter of upper buoy and the diameter of lower buoy damping plate, which makes the energy capture factor reach the maximum. In terms of PTO parameters, there is an optimal damping coefficient, and the relative reference value in engineering practice is given. The research results will provide valuable reference for the future research and design of the double-floating-body wave energy converter.
2020 Vol. 38 (6): 589-595 [Abstract] ( 38 ) [HTML 1KB] [ PDF 5515KB] ( 583 )
596 Instability of charged jet in liquid-liquid system
WANG Xiaoying*,WU Shibo,WANG Zhentao,WANG Junfeng,WANG Dongbao
For biodiesel emulsification process in the method of electrostatic atomization in liquid-liquid system,the dispersion equation of charged liquid jet was established. By numerical calculation with Matlab, the effect of jet velocity, charged voltage, viscosity and surface tension of water and biodiesel on the jet instability was obtained. The results show that the increasement of the velocity or the charge voltage of the water jet in water -biodiesel system can lead to the increase of the maximum growth rate of the interface wave and the corresponding optimal wave number. The viscosity of the water impedes the breakup and atomization of the water jet, while the viscosity of the biodiesel contributes to the breakup and ato-mization of the water jet. The smaller the interfacial tension of water-biodiesel, the more favorable it is to the process of electrostatic atomization in liquid-liquid system. Therefore, in the practical application of biodiesel emulsification in the method of liquid-liquid electrostatic atomization, in addition to increasing the jet velocity and the charged voltage, the temperature of water should be increased and the temperature of biodiesel should be reduced as much as possible to obtain fine grained uniform discrete droplets and to get high quality biodiesel emulsified fuel.
2020 Vol. 38 (6): 596-601 [Abstract] ( 38 ) [HTML 1KB] [ PDF 1442KB] ( 487 )
602 Flow corrosion of casing steel for oil and gas field in two-phase flow
ZHOU Hao,JI Qingfeng*,LIU Wen,MA Hongyan,WANG Lei
The influence of different silica sand mass fractions and flow corrosion time on the mass loss rate and corrosion electrochemical behavior of N80 casing steel in liquid-solid two-phase flow fluid containing silica sand and chloride ion was investigated with a rotating cylindrical electrode device and an electrochemical workstation. The surface of specimens after flow corrosion was characterized and analyzed by three-dimensional digital microscope Smartzoom 5. The results show that the flow corrosion morphology of N80 steel in liquid-solid two-phase flow containing silica sand and chloride ion is typical particle cutting trace with a few corrosion pits, and the mechanism of flow corrosion is synergistic inte-raction between erosion and corrosion processes. In the range of sand mass fraction from 1% to 3%, the flow corrosion rate increases with the increase of sand mass fraction. However, when the sand mass fraction increases to more than 4%, larger sand content forms a ″shielding effect″, which reduces the flow corrosion rate. With the variation of two factors, the polarization rate of the cathode polarization curve is much higher than that of the anode polarization curve for N80 steel flow corrosion process. The corrosion reaction is controlled by oxygen depolarization reaction of cathode. With the increase of time, the mass loss of N80 steel in liquid-solid two-phase flow fluid increases linearly, and the corrosion rate gradually decreases which reaches the lowest at 9 h and then increases.
2020 Vol. 38 (6): 602-606 [Abstract] ( 34 ) [HTML 1KB] [ PDF 26670KB] ( 299 )
607 Simulation of ascending aorta balloon counter pulsation
LIU Hongyan,WANG Hao,JING Teng,CHEN Si,WANG Kun,HE Zhaoming,*
To explore the assistant effect of balloon pump coupled with ascending aorta on heart failure, the model of balloon pump coupled with ascending aorta and the model of valve added after balloon pump were established on the basis of systemic blood circulation system model by electro-hydraulic analogy, and the mathematics equation was established according to the equivalent circuit diagram.Using Matlab to complete numerical simulation and the auxiliary effect of the two methods on heart fai-lure was explored. It is found that both models can increase aortic diastolic pressure, reduce left ventri-cular ejection resistance and ventricular work, and increase stroke output and ejection fraction. Both models have auxiliary effect on heart failure. By comparing between the two methods, it is found that the artificial valve placed behind the balloon can prevent the peripheral blood from refluxing during the balloon deflation, enhance the suction of aorta, reduce the pressure of aortic sinus, and further reduce the left ventricular ejection resistance and ventricular work. The model of balloon-assisted valvular implantation coupled with ascending aorta is feasible. It has better effect on heart failure.
2020 Vol. 38 (6): 607-612 [Abstract] ( 43 ) [HTML 1KB] [ PDF 6354KB] ( 511 )
613 Relationship between subsurface seepage pipe pressure and soil water movement at tea root zone
ZHANG Hengnian,ZHANG Chuan*,YAN Haofang,HU Yongguang,ZHAO Baoshan,LI Xinyu,XING Deke
In order to investigate the relationship between the pressure at both ends of a subsurface seepage pipe and the soil water movement under sinfiltration irrigation, experiments were carried out by testing different irrigation flow rates and irrigation durations. By continuously monitoring the changes in soil moisture content in the root zones of tea trees(30 cm in the vertical direction and 30 cm in the horizontal direction of the soil moisture monitoring profile)and the pressure at both ends of the subsurface seepage pipe, the soil water movement under different pressures at both ends of the subsurface seepage pipe was examined. The results show that soil water content before irrigation influences the infiltration capacity, and impacts the direction of soil water movement. The cumulative pressure at both ends of the subsurface seepage pipe shows a linear relationship with irrigation duration. The slope of the cumulative pressure curve changes suddenly when the soil moisture content reaches the field capacity at the tea root zone. It is found that the duration of irrigation at the time of abrupt change in slope of the cumulative pressure curve can be used as a critical value for controlling the full irrigation(100% field capacity), thereby avoiding the loss of soil water in deep percolation. The study provides a reasonable reference method for rational control of irrigation duration.
2020 Vol. 38 (6): 613-619 [Abstract] ( 40 ) [HTML 1KB] [ PDF 8993KB] ( 461 )
620 Simulation on wind-proof effect of wind wall based on CFD
LI Jiale,ZHAO Wenju*,YAN Zheng
According to the windproof effect of Wtype wind wall, threedimensional steadystate simulation was carried out based on CFD for the nearsurface winds of 3 m and 5 m in 5 m/s and 13 m/s two different wind speeds respectively. The results show that when the airflow passes through the wind wall, the position speed below the wall is greatly reduced, but the position above the wall height begins to accelerate, and there is obvious zoning action. When the wind speed is 5m/s, with the increase of flow length, the wind speed of the 3 m wind wall increases from 0 in the triangle trend,the wind speed residual coefficient near the surface at 12m is 0.91-0.98 and doesn′t exceed 1.5 m high windshield wind speed increases gradually in rectangular trend from 0. In the range of h<3.1 m and L<6.0 m,nearsurface wind speed residual coefficient of 5 m wind wall is 2.02%-93.40% of 3 m wind wall, and in the range of h<3.1 m and L>6.0 m,nearsurface wind speed residual coefficient is 7460%-8940% of 3m wind wall, the windproof effect is obvious. When the wind speed is 13 m/s, the zoning effect is more obvious. In the range of h<3.1 m and L<6.0 m,the nearsurface wind speed residual coefficient of 5 m wind wall is 5.2%-43.5% of the 3 m wind wall. and in the range of h<3.1 m and L>6.0 m,the nearsurface wind speed residual coefficient is 4.8%-73.3% of the 3 m wind wall.
2020 Vol. 38 (6): 620-625 [Abstract] ( 40 ) [HTML 1KB] [ PDF 2602KB] ( 431 )
626 Operation effect of improved straight-line desilting basin in agricultural micro-irrigation
HU Songke,LI Wenhao*,YANG Guang,LIU Ningning
Aiming at the disadvantages of traditional straight-line desilting basin, such as low sediment removal rate, weak adaptability and large footprint area, based on sediment deposition cha-racteristics, flow characteristics and sediment distribution characteristics in the tank, the drainage section and overflow weir were improved. Combined with the principle of eddy current sediment ejection, vortex tubes were set at the back of overflow weir to achieve double desilting. A physical model was built to test the flow velocity, sediment grain size and concentration at different points of the desilting basin, and to study the sediment variation law by distance and the underflow rate of the double desil-ting basin. The results show that single trial sediment is mainly bed load sediment, and the quantity of precipitate is more than 95%. The second trial sediment is mainly suspended sediment load, which is increased by 12.70% and 18.80% compared with the desilting basin without spillway trough and vortex tube. The total bed cleaning efficiency of the system can reach more than 96.88%, which greatly improves the underflow rate of sediment in the pool. It fully shows that the improved desilting basin can significantly improve the sediment settling effect, and the research results can provide some technical support for the large-scale application of micro-irrigation engineering.
2020 Vol. 38 (6): 626-631 [Abstract] ( 41 ) [HTML 1KB] [ PDF 1408KB] ( 435 )
632 Effects of water-fertilizer interaltion with planting density on water and nitrogen use efficiency and yield of winter wheat under sprinkler irrigation system
ZOU Luyang,CHEN Zhen,DUAN Fuyi,MA Chunya,FAN Yongshen*
To study the effects of different planting density and nitrogen application frequencies on soil moisture, nitrate nitrogen content, and winter wheat yield under the conditions of integrated irrigation and water and fertilizer application. The experiment set two planting densities(187 and 262 kg/hm2)and three nitrogen application frequencies(three times after topdressing, two times after topdressing, and one time after topdressing). The test results show that planting density and nitrogen application frequency significantly affect winter wheat grain yield, and there is a significant interaction effect between them. With the planting density increasing, the soil water storage in the winter wheat growing period from 0 to 100 cm increases significantly. The soil water content in the root growth layer of the main growing period increases significantly, and the water content at the depth of 100 cm in the booting stage increases. Compared with D1, it increases by 29.42%, 3.10% and 32.04%. While the water content at the depth of 80cm soil layer during the grouting period increases by 29.69%, 27.52%, and 25.71% compared with D1. When the planting density is 262 kg/hm2 and the frequency of nitrogen application is once, the yield of winter wheat is higher, and the soil nitrate nitrogen in the deep soil layer is less in the season. Comprehensive analysis shows that the planting density and nitrogen application frequency are the local winter wheat growth best practice.
2020 Vol. 38 (6): 632-636 [Abstract] ( 56 ) [HTML 1KB] [ PDF 1088KB] ( 413 )
637 Improvement of particle swarm optimization and its application in agricultural water resources allocation
ZHANG Qian,ZHANG Jianfeng*,LI Tao,XIN Yanlin,SHI Juan
In order to rationally allocate the agricultural water resources in Dali County and improve the total household income in Dali County, the optimal allocation model of the agricultural water resources was set up, and the rational planting area of the main crops and the optimal allocation scheme of agricultural water resources in Dali County were obtained. The problem of rational allocation of limi-ted agricultural water resources in different crops in irrigated areas in Dali County was solved, and the goal of maximizing total revenue was achieved. The particle swarm optimization(PSO)was used in the model solution, and two improvements were made to the linear decrement of inertia weight and the speed limit particle swarm. The problem of program interruption caused by the definition domain of particle escape function was solved. The results show that the total revenue of the rich water year(P=25%)is 2 billion 978 million yuan, the total revenue of the flat water year(P=50%)is 2 billion 975 million yuan, and the total revenue of the dry year(P=75%)is 2 billion 950 million yuan. Compared with the total revenue of 2 billion 898 million yuan before the optimization, more water resources are distributed to the economic crop cotton. The optimum distribution of plant area and water quantity is achieved. Comparing the PSO algorithm before and after the improvement, the improved PSO algorithm has strong optimization ability, and the result is reliable and reasonable, which provides a new solution for the optimization of regional water resources allocation.
2020 Vol. 38 (6): 637-642 [Abstract] ( 34 ) [HTML 1KB] [ PDF 1081KB] ( 438 )
643 Design and experiment on fertile solution pH value and electrical conductivity measuring instrument
FENG Ruijue,WANG Zhidong*,LI Zhifeng
In order to realize rapid and on-site detection of fertile solution pH/EC, one instrument was designed, which was composed of MSP430F2132, pH/EC sensor, regulated power module, human-computer interface, pH/EC signal processing circuit, EC signal processing circuit, etc. Through preparing 9 different pH solutions between 10-40 ℃, one test for the effect of temperature on the pH value was made by comparing with the calculated value of empirical equation, and the result shows that in the soil environment(6.5-7.5 pH)which is suitable for crop growth, the measurement error by temperature can be neglected. 195 different kinds of fertile solution were tested, whose EC value ranged from 1.0 to 19.5 ms/cm, and the test used 8 grades of resistance grading measurement mode, whose measuring excitation signal was square wave signal with amplitude ±3.5 V and 4 kHz frequency, and temperature compensation of EC was made. The calibration and verification test of measuring instrument show that the maximum absolute measured value errors of pH and EC are 0.04 and within ±0.1 ms/cm, which can meet the requirements of agricultural engineering.
2020 Vol. 38 (6): 643-648 [Abstract] ( 43 ) [HTML 1KB] [ PDF 2007KB] ( 558 )
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