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Journal of Drainage and Irrigation Machinery Engin
 
2021 Vol.39 Issue.2
Published 2021-02-25
1
2021 Vol. 39 (2): 1- [Abstract] ( 19 ) [HTML 1KB] [ PDF 988KB] ( 424 )
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2021 Vol. 39 (2): 2- [Abstract] ( 24 ) [HTML 1KB] [ PDF 1019KB] ( 534 )
109 Cavitation characteristics of high-speed submersible axial-flow pump
CHEN Bin,YANG Chen*,ZHANG Hua,WANG Yuan,XIA Chenzhi
To study the cavitation characteristics of the axial-flow pump, a high-speed submersible axial flow pump with specific speed ns=700 was selected. Based on ANSYS CFX software, the curve of external characteristics was obtained, and it was found that the calculated results had errors with the experiment′s under the large flow condition. Using Rayleigh-Plesset cavitation model and SST turbulence model, the critical cavitation pressure was obtained. Analyzing the influence of inlet pressure and flow rate on cavitation volume fraction, the result shows that the critical cavitation pressure is increased with the increase of flow rate and rotation speed. The cavitation allowance in the design condition is 7.08 m and the critical pressure is 73 kPa. When the inlet pressure is below the critical pressure, se-rious cavitation occurrs in the pump. The cavitation position is mainly at the inlet rim of the blade′s suction surface and the separation position of the fluid before and after the maximum thickness. Since the pressure is larger than the vaporization pressure, there is no cavitation on the pressure surface. Increasing or decreasing the pump flow rate both lead to the aggravation of cavitation.Therefore, in engineering applications, the cavitation can be suppressed by increasing the inlet pressure of the pump and adjusting flow rate to the design value.
2021 Vol. 39 (2): 109-115 [Abstract] ( 60 ) [HTML 1KB] [ PDF 8179KB] ( 626 )
116 General calculation model of effective volume utilization coefficient for rotor pumps
LI Yulong*,ZANG Yong,ZHAO Yan,LI Xiurong
To construct a general model suitable for calculating volume utilization coefficient(VUC)of all kinds of external meshing rotor pump, first, for one type of rotor with wide-top which could reduce radial leakage, the general profile structure and profile equation with change in instantaneous center radius were given; secondly, based on a rotor pair with exactly the same structure and size, and the geometric relationship of the rotor pair in minimum clearance position, the accurate calculation formula of conjugated cross-section area and VUC with instantaneous center radius was derived step by step; finally, the cycloid rotor was used as an example for verification and analysis. The results show that effective cross-section area has two parts: inherent cross-section area of rotor itself and minimum clea-rance additional cross-section area of rotor pair. It can also be divided into smaller dynamic conjugated cross-section area affected only by instantaneous center radius and larger static pitch circle cross-section area. Lobe number, initial normal angle and addendum angle are three independent parameters which affect effective VUC. The larger the lobe number, the smaller the effective VUC is; the larger the initial normal angle, the larger the effective VUC is;the larger the addendum angle, the smaller the effective VUC is. The addendum angle has a little effect on the effective VUC, which is beneficial to reduce radial leakage. The general calculation model of effective VUC can provide theoretical basis for further research on rotor pumps.
2021 Vol. 39 (2): 116-121 [Abstract] ( 50 ) [HTML 1KB] [ PDF 1709KB] ( 1176 )
122 Sensitivity of different sealing structures to axial movement of centrifugal pump impeller
LI Yibin*,DAI Xiaohui,WANG Zhengkai
To reveal the quantitative relationship between axial movement, axial force of centrifugal pump impeller and seal-ring structure, the influence and mechanism of axial movement on the hydraulic performance and axial force of centrifugal pump were studied for two types of sealing structures, namely single and double seal-ring. The results show that compared with the single seal-ring structure, the double seal-ring structure has a significant inhibitory effect on high-pressure liquid lea-kage, and its volumetric efficiency is higher. Under rated operating conditions, the head and efficiency of the double seal-ring structure pump are increased by 0.60%, and the experimental and numerical errors are less than 4%; the total axial force of the single seal-ring structure is less than the double seal-ring structure. The rotor axial movement significantly affects the impeller reaction force, shroud force and total axial force. When the axial movement ΔL=1 mm, the impeller work capacity is strong and the hydraulic performance of the pump is optimal; when the impeller moves toward the inlet, the impeller work capacity is weakened, resulting in the degradation of hydraulic performance of the pump. The axial movement of the rotor causes the volute section form an asymmetric reverse vortex, which affects the speed distribution law of the volute and impeller.

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2021 Vol. 39 (2): 122-127 [Abstract] ( 47 ) [HTML 1KB] [ PDF 6402KB] ( 631 )
128 Program design of pump experiment non-collected data display based on LabVIEW
WEN Huizhi,TANG Yue,TANG Lingdi*
In order to solve the problem of inconvenient reading and low reading accuracy of non-collected data in pump experiment, and realize a seamless display of non-collected data, a non-collected data tracking display program of pump performance curve was designed based on LabVIEW, a virtual instrument software development platform. By using ″generalized polynomial fitting″ control and the least square fitting method, the polynomial equations of flow-head, flow-efficiency and flow-power fitting curve were obtained. By adding the event branch of ″mouse movement″ in the performance curve in the ″event structure″, the coordinate value generated by each movement of mouse in the performance curve was refreshed; the flow data corresponding to the new mouse position coordinates were brought into the fitting curve equation to calculate the new head, efficiency and power value of the current flow value. The display format of the performance data value displayed at the mouse position was adjusted to make it display in the set format at the mouse position. The results show that when the mouse moves in the pump performance curve, the program can accurately track the mouse position, and show the flow, head, efficiency and power values corresponding to the the mouse position. In practical application, it is very convenient for tester to read non-collected point data from the performance curve.
2021 Vol. 39 (2): 128-131 [Abstract] ( 54 ) [HTML 1KB] [ PDF 9258KB] ( 546 )
132 Short-term generation planning of cascade hydropower station in Jinxi River Basin
WANG Chaojie,GUO Huijuan*,LIU Zhijia
In order to solve the cascade hydropower station scheduling problems caused by nonlinear, non-convex, multi-constrained, and complex time-space coupling, reduce the water consumption rate, and improve the economic benefits and operation level of the entire cascade hydropower station group, the Jinxi River Basin was taken as the research object, the constraints such as power grid requirements and unit safety were fully considered, dynamic planning algorithms and intelligent algorithms were integrated and gradually optimized to achieve the refined preparation of the daily po-wer generation plan. Compared with the actual operation results, it can be seen that after the optimization algorithm is used for optimal dispatching, the hydropower station generates electricity.The amount of electricity has been increased to a certain extent, and the increase of electricity is about 2.7% to 3.4%. Based on the system engineering theory and optimization algorithms, the in-plant load distribution and unit combination problems of cascaded power stations were studied. Based on system enginee-ring theory and optimization algorithms, an optimization model of unit start-up and shutdown and load adjustment to meet the multi-objective constraints of hydropower transmission safety and equipment safety management was established. The target was the minimum water rate. The load was decomposed to each unit of the power station, and the unit power output process is calculated. In actual operation, the power station exceeds the daily power generation output, and it is fully used within the deviation assessment range. The feasibility and rationality of the model are verified by an example.
2021 Vol. 39 (2): 132-136 [Abstract] ( 41 ) [HTML 1KB] [ PDF 9702KB] ( 583 )
137 Three-dimensional numerical simulation in different flow conditions of hydro-brake
LI Chao,MA Guangfei*,LIU Deyou,JIANG Chao,FANG Yong,
In order to study the throttling effect and working characteristics of hydro-brake under different rainfall conditions and explore the throttling law, a three-dimensional numerical simulation was carried out to analyze hydro-brake by VOF model. The results show the greater the flow rate, the stronger the throttling capacity, but the higher water level that begins to produce throttling effects. And the throttling capacity further increases due to the direct impact on the hydro-brake, which consumes potential energy; the velocity distribution in the hydro-brake is different, but the velocity around the air zone in the center and the wall region is always low; the pressure has an eccentric layered distribution in the hydro-brake. And there is a negative pressure zone in the center, the greater the negative pressure zone is, the stronger the throttling capacity is. In the future research, the throttling effect can be improved by increasing the range of negative pressure area. The external and internal characteristics in different flow conditions, which can provide a theoretical basis and technical guidance for further research.

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2021 Vol. 39 (2): 137-143 [Abstract] ( 39 ) [HTML 1KB] [ PDF 6262KB] ( 499 )
144 Effect of tower shadow effect on aerodynamic performance of large horizontal-axis wind turbine under wind shear
YANG Congxin,ZHANG Jianmei*,WANG Yin,YANG Haonan
Taking the wind rotor of NH1500 three-blade horizontal-axis wind turbine with the upwind direction as the research object, the aerodynamic load and the flow field of the wind turbine blade and the wind turbine under the condition of wind shear were analyzed based on CFD method. The results show that the difference of the pressure distribution on the blade surface between the two models with and without towers is mainly reflected in the front edge of the blade and on the suction surface under the condition of wind shear; in one rotation period, the amplitude of the load fluctuation of the tower model is larger than that of the no-tower model. Comparing with a single blade,the load fluctuation amplitude of the wind turbine is smaller, the time domain with the azimuth angle from 150° to 210° is the tower-image central area of the tower model, and the tower-image effect is the main factor leading to the periodic fluctuation of the output power of the wind turbine. The tower model is more complicated when the blade phase angle is 180°, and the flow field of the wind wheel model with no tower is more complex; when the blade passes through the tower, the flow separation point is offset, and the speed of the two sides of the tower is not symmetrical. The study provides a reference for further study of the effect of the tower shadow on the aerodynamic characteristics and the space flow field of the wind turbine.
2021 Vol. 39 (2): 144-150 [Abstract] ( 58 ) [HTML 1KB] [ PDF 5454KB] ( 787 )
151 Influence law of erosion wear of blowdown valve based on CFD numerical simulation
ZHONG Lin,FENG Guihong,ZHANG Jichun,WEI Gang
The puncture phenomenon of the sewage valve of the main equipment of the sewage system of the gas transmission station has occurred in use, resulting in a safety accident of natural gas leakage. The CFD simulation method was used to evaluate the erosion wear performance of the sleeve-type blowdown valve by factors such as fluid flow rate, particle size, sand-containing volume ratio, and valve opening. The results show that the erosion damage between the valve core and the seat sealing contact wall surface is the main reason for the failure of the entire drain valve. When the flow rate is 1~9 m/s, the particle size is 0.1~0.5 mm, the sand-containing volume ratio is 2%~10%, and the valve opening range is 15%~90%, the erosion wear rate is positively correlated with the fluid flow rate. The erosion wear area significantly increased with flow velocity increasing. Increased sand concentration increases the frequency of particles hitting the valve cavity wall surface, and the erosion rate increases approximately linearly. The change of particle size has little effect on the average erosion wear rate of the sewage valve. The erosion damage caused by the erosion behavior of small particles is more uniform than that of large particles. During the opening of the blowdown valve in the range of 15% to 30%, the degree of erosion wear of the valve changes drastically. From 60% of the opening, the da-mage of the valve tends to be stable. At the same time, in the process of increasing the valve opening, the maximum erosion wear area of the valve core gradually movs from the circumferential wall surface to the lower end surface of the valve core. This study provides some guidance for the overall erosion resis-tance evaluation of blowdown valves.

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2021 Vol. 39 (2): 151-157 [Abstract] ( 70 ) [HTML 1KB] [ PDF 3230KB] ( 634 )
158 PIV experiment and numerical simulation of improved INTER-MIG impeller vortex structure
LIN Weizhen,ZHOU Yongjun*,WANG Lulu,TAO Lanlan
The trailing vortices around an improved INTER-MIG impeller were investigated in a stirred tank using particle image velocimeter(PIV)and computational fluid dynamics(CFD). The numerical simulation results were compared with the PIV experiments and the differences of several turbulence models were analyzed. The vorticity of trailing vortex structure was analyzed by 2D-PIV and the effect of impeller diameter on the trailing vortex was discussed. The results show that the LES is better than the Reynolds average for the prediction of the trailing vortex. The improved INTER-MIG impeller ge-nerates an asymmetrical trailing vortex during motion, the lower vortex of the impeller is formed before the upper vortex, and the maximum vorticity of lower vortex is higher than the upper vortex. In the process of forming the trailing vortex to the maximum, the diameter of impeller has a great influence on the radial displacement of the lower vortex. When D=0.57T, the speed of the trailing vortex is the fastest in the radial direction and the turbulent kinetic energy is the largest. When the trailing vortex begins to decay, the larger the diameter of the blade,the faster the tail vortex dissipates. The maximum value of turbulent kinetic energy is located between the two vortexes, which increases with the deve-lopment of trailing vortexes and decreases with the decline of trailing vortexes. The research results reveal the stirring mechanism in stirred tank with the improved INTER-MIG impeller, and can provide reference for the engineering application and optimization design of stirred tank with the improved INTER-MIG impeller.
2021 Vol. 39 (2): 158-164 [Abstract] ( 52 ) [HTML 1KB] [ PDF 4698KB] ( 591 )
165 Numerical simulation and visualization of static flow field of straight blade vertical axis wind turbine
BAI Yuedi,TONG Guoqiang,Qu Chunming,LI Yan*,Zhao Bin
For studying the influence of airfoils on the start-up characteristics of vertical axis wind turbines, S809, a asymmetric airfoil, and NACA0018, a symmetrical airfoil, were chosen as blades. Firstly, the static torque was obtained by numerical simulation, and the azimuth Angle with obvious difference was obtained, and the vorticity and vector diagram were obtained. visualization experiment was used to verify simulation results. Combining with them, the flow field were analyzed. The results show that NACA0018 airfoil has better starting performance than obverse-installed S809 airfoil. The vortex of blade wake flow makes the flow field unstable and causes energy loss. The wake flow of both airfoils generates vortices with varying degrees, making the flow be complex. Compared with NACA0018 airfoil, the shear flow at the back of the obverse-installed S809 airfoil is stronger, and the vortices are closer, thus influence is more significant.

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2021 Vol. 39 (2): 165-171 [Abstract] ( 73 ) [HTML 1KB] [ PDF 4588KB] ( 569 )
172 Applicability of infiltration models to line source length under vertical line source
CHENG Huijuan,YU Qingfeng*,WANG Quanjiu,
The law of soil moisture infiltration under vertical line source irrigation was analyzed to investigate the infiltration rate and cumulative infiltration volume of different line source lengths, through the indoor soil box simulation test, three conventional infiltration models for the applicability of the infiltration law of different line source lengths were studied. The results show that the infiltration rate and cumulative infiltration volume increased with the length of the line source, all three models can simulate the infiltration law under different line source lengths, where the Kostiakov infiltration formula was the most accurate, the Philip infiltration model was more suitable for the simulation of the early and middle infiltration. Horton(deformation)infiltration formula was more suitable for the simulation of the middle and late infiltration. It was more suitable for the case where the length of the line source was greater than 20 cm. The empirical formulas of the three infiltration models under different line source lengths were obtained, the infiltration rate of the three infiltration models was higher than that of the cumulative infiltration volume, and the calculated value of cumulative infiltration amount of three infiltration models was higher than the measured value. The research results can provide a theoretical basis for the popularization and application of vertical line source irrigation technology.
2021 Vol. 39 (2): 172-178 [Abstract] ( 53 ) [HTML 1KB] [ PDF 1841KB] ( 650 )
179 Analysis of numerical model structural uncertainty influence on simulation results
LI Xingnan,JIN Jiangyue,JIANG Yanan*
Based on the MODFLOW module in GMS, a numerical simulation model of underground water flow was developed, which focuses on the structural uncertainty of groundwater numerical model and takes Etuoke Banner, Inner Mongolia as an example. The influence of model structure(aquifer thickness, parameter partition)and uncertainty factors of model parameters on the simulation results was analyzed. The results show that the accumulative and maximum value of the absolute difference between the uncertain aquifer scenario(the lower boundary of the aquifer is set to the average of 870 m of water-proof floor)and the actual situation is 701 m, which plays a main role in controlling the simulation results. When the lower boundary of the aquifer is set to 910 m and 940 m, the accumulative sum increases to 1 013 m and 1 593 m respectively. Compared with only considering a single uncertainty factor, the accumulative sum of model parameters and aquifer uncertainty scenarios is 738 m at the same time, and the accumulative sum of parameter zoning and aquifer uncertainty scenarios is 791 m at the same time. Therefore, when constructing the numerical simulation model of groundwater flow, the reasonable degree of spatial structure generalization of aquifer should be given priority, and the comprehensive influence of multiple uncertain factors on the simulation results should be considered, so that the numerical simulation model of groundwater flow can reflect the real groundwater flow situation more accurately.

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2021 Vol. 39 (2): 179-185 [Abstract] ( 49 ) [HTML 1KB] [ PDF 5866KB] ( 517 )
186 Characteristics and causes of potential evapotranspiration in Ningxia Region
LI Chen,LI Wangcheng,DONG Yaping,WANG Shuangtao,WANG Xing,ZHAO Yan
According to the daily meteorological data of 11 national meteorological stations in Ningxia from 1962 to 2017, the Penman-Monteith formula was used to calculate the potential evapotranspiration(ET<sub>0</sub>)daily value series in Ningxia, using climate tendency rate and Mann-kendall mutation test. ArcGIS inverse distance weighted spatial interpolation, sensitivity analysis and contribution contribution rate are used to analyze the temporal and spatial variation characteristics and influe-ncing factors of ET<sub>0</sub> in Ningxia. The results show that the average ET<sub>0</sub> of Ningxia region from 1962 to 2017 is 1 073 mm, of which the highest in the central arid zone(1 135 mm), the third in the Yellow River irrigation area(1 095 mm), the lowest in the southern mountainous area(893 mm); the Ning-xia ET<sub>0</sub> in 1986 The mutation occurred, and the amplitude decreased by 0.571 mm/a before the mutation, and increased by 0.109 mm/a after the mutation. The whole period increased by 0.523 mm/ad, but the variation range was not significant. ET<sub>0</sub>has different sensitivity to meteorological elements in different regions. The Yellow River irrigation area and the central arid zone are most sensitive to the hig-hest temperature, the sensitivity coefficients are 0.41 and 0.43 respectively, and the southern mountainous areas are relative humidity(-0.45). The contribution rate of ET<sub>0</sub> is different. The dominant factor in the Yellow River irrigation area and the southern mountain area is the lowest temperature, and the central arid zone is the average wind speed. Before and after the mutation, the meteorological elements with the highest contribution rate to ET<sub>0</sub> in the Yellow River Irrigation District, the Central Arid Zone and the Southern Mountain Region were changed from average wind speed, relative humidity and minimum temperature to relative humidity, average wind speed and minimum temperature.
2021 Vol. 39 (2): 186-192 [Abstract] ( 34 ) [HTML 1KB] [ PDF 4656KB] ( 738 )
193 Effects of different water and biochar treatments on lodging resistance and yields of rice
MIAO Zhiying,SHAO Guangcheng*,FANG Kai,WANG Xiaojun,MENG Jiajia,TANG Shuhai
In order to study ways of how to enhance the lodging resistance ability of rice stem, leaching-pond experiment was carried out in Lianshui Water Conservancy Research Institute in 2017. The expe-riment had two irrigation control modes(W1 and W2)and two biochar application levels(B0: no biochar is added; B1: biochar is added with a level of 50 g/kg)to analyze the effects of irrigation regime and biochar amendment on stem characters, lodging resistance and grain yields of rice. The results showed that the application of biochar could improve the agronomic characteristics of rice stem. Compared with B0 treatment, B1 treatment shortened the internode length of rice stem base, and increased its outer diameter and wall thickness.The application of biochar also had significant effects on the cumulative damage energy, bending resistance and bending moment of the rice stem. The lodging resis-tance indexes of the first, second and third internodes of B1 treatment were lower than those of B0 treatment by 34.56%, 31.61% and 26.03% respectively. In addition, there were positive effects of biochar application on the total grains per panicle, seed setting rate, 1 000-grain weight and yield of which the increases of B1 treatment were 5.66%, 6.12%, 2.59% and 12.73%, respectively, compared with those of B0 treatment. Irrigation control treatment had little effect on lodging resis-tance and yields of rice while the irrigation-biochar interaction effect had a remarkable positive influence on the latter. The most stem lodging resistance ability and highest values of yields were realized under the condition of W1 irrigation control and the biochar application B1. In summary,the results indicate that the W1 irrigation control and the biochar application B1 should be an effective planting pattern for improving stalk lod-ging resistance characteristics and yields of rice.This research result can provide effective irrigation-biochar management technology support for rice production in China in the future.
2021 Vol. 39 (2): 193-199 [Abstract] ( 45 ) [HTML 1KB] [ PDF 1388KB] ( 597 )
200 Research status and development trend of fertilization equipment used infertigation in China
LI Hong*,TANG Pan,CHEN Chao,ZHANG Zhiyang,XIA Huameng
In order to promote the development and popularization of fertilization equipment in China, the current development status of fertilization equipment used in fertigation were been summarized. The technical characteristics, research progress and existing problems of Venturi fertilizer, differential pressure tank, proportional fertilization pump, plunger pump and solid fertilizer dissolving fertilization device were mainly explained and analyzed. Based on the concept of green agriculture development and the development needs of the agricultural internet of things, the future research priorities and development trends of fertilization equipment were proposed. Under the background of the country′s vigorous development of sustainable ecological agriculture, it is urgent to combine the characteristics of regional planting of crops, comprehensively implement strategies, innovate and develop a variety of advanced fertilization equipment and technologies, and establish water and fertilizer management technologies system to effectively improve water and fertilizer utilization. The flow law of water and fertilizer solution in the pipe, optimization design methods, product development and standardization, irrigation and fertilization schedule, and intelligent fertigation system should be investigated to achieve multifunctional, low energy consumption and precision of fertilization equipment.
2021 Vol. 39 (2): 200-209 [Abstract] ( 46 ) [HTML 1KB] [ PDF 2183KB] ( 884 )
210 Research on atomization performance of low-pressure atomization nozzle
ZHU Xingye,ZHANG Aiying*,ZHANG Linguo,SHI Yongjie,JIANG Nan
In order to further understand the atomization performance of the low-pressure atomization nozzle and provide a theoretical basis for optimizing the performance of the nozzle, relevant tests were carried out. The aperture of low-pressure atomization nozzle is 0.5, 0.8 and 1.0 mm, the pressure is 0.08, 0.11 and 0.14 MPa, the spacing between nozzle and cone disk is 2, 4 and 6 mm, the cone angle is 150°, 120° and 90°, and the orthogonal test was designed and carried out. By measuring the atomization water distribution characteristics of 3 kinds of nozzles with different apertures in the atomization range of 0-2.4 m, and analyzing the uniformity of the nozzles in the square combination and triangle combination with different combination spacing, the range analysis was carried out on the results to obtain the influence trend of each factor. The results show that the radial water distribution presents a normal distribution, the highest atomized water point is close to the end of atomization range, and is positively correlated with the nozzle diameter. Comparing with triangle combination, square combination is better. The order of influence on atomization range is aperture, cone angle, pressure and spacing, the order of influence on triangle combination uniformity coefficient is cone angle, aperture, pressure and spacing, and the order of influence on square combination uniformity coefficient is cone angle, aperture, pressure and spacing.
2021 Vol. 39 (2): 210-216 [Abstract] ( 60 ) [HTML 1KB] [ PDF 1940KB] ( 652 )
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