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Journal of Drainage and Irrigation Machinery Engin
 
2022 Vol.40 Issue.4
Published 2022-04-25
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2022 Vol. 40 (4): 1- [Abstract] ( 22 ) [HTML 1KB] [ PDF 10703KB] ( 343 )
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2022 Vol. 40 (4): 2- [Abstract] ( 21 ) [HTML 1KB] [ PDF 1352KB] ( 326 )
325 Design of high-temperature and high-pressure RCP test bench
CAI Long,CHEN An*,XU Jian,XUE Linhui,LONG Yun
To insure the safety and functionality of each reactor coolant pump(RCP)before it leaves the factory, and verify its performance, the high-temperature and high-pressure RCP test bench was designed and studied, the composition, function and the safety design of the test bench were introduced as well. The finite element model of the structure was established to analyze the natural vibration characteristics. It was found that the natural frequency around rotation frequency of 50 Hz is far away from the support of the test pump, which will not affect the operation of the test pump. Some reinforcement measures were obtained by analyzing the influence of flow-induced vibration on the test bench and the RCPs. Meanwhile, the design of the test bench also considers the thermal stress and displacement from the cold state to the hot state. These methods ensure that the RCP runs stably on the test bench, and ensures the safety of the test bench under the cold and heat alternating and transient operating conditions of the loop system. According to the measurement, after the completion of the construction, the circuit of the test bench driven by thermal stress, and the corresponding displacement occurs in the expected direction. The displacement is basically consistent with the theoretical calculation. Several main failure modes and preventive measures such as brittle fracture failure, ductile fracture failure, joint leakage failure, elastic or plastic instability, and uniform corrosion failure of the test bench were introduced. The verification test for the RCP of the small reactor was completed by this test bench. The design technology and implementation content adopted can guide the design and construction technology of high-temperature test benches, which has greater engineering and academic reference significance.
2022 Vol. 40 (4): 325-331 [Abstract] ( 28 ) [HTML 1KB] [ PDF 3364KB] ( 516 )
332 Effect of tip clearance on flow behaviors in a multiphase pump
SHI Guangtai，LIU Zongku，WANG Binxin
To reveal the effect of the tip clearance on the flow behaviors in the pump, the ANSYS CFX software is employed to simulate the gas-liquid two-phase flow under different tip clearances at the inlet gas void fraction(IGVF)=10%. Meanwhile, the effect of the tip clearance on the flow behaviors is analyzed and summarized. Results show that with the increase of the tip clearance, the low-pressure region proportion at the impeller blade inlet decreases significantly, and the pressure difference between the impeller inlet and outlet gradually declines. In addition, the deflection of the pressure contour on the blade pressure side near the blade tip emerges, and with the increase of the tip clearance, the deflection phenomenon becomes more severe. In the presence of tip clearance, the gas accumulation at the impeller hub is significantly improved, and with the increase of the tip clearance, the gas accumulation near the blade tip in the tip clearance is more obvious, and the gas accumulation location at the diffuser hub moves downstream in the flow direction. The findings provide a basis for hydraulic optimization, performance improvement and structural design of the multiphase pumps.

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2022 Vol. 40 (4): 332-337 [Abstract] ( 45 ) [HTML 1KB] [ PDF 3225KB] ( 423 )
338 Pump failure water hammer protection of pumping station pressurization and gravity combined water supply project
DING Ziheng,YU Xiaodong*,MA Shibo,ZHANG Zhexin,ZHANG Jian
Aiming at the long-distance and high drop water conveyance project with the combination of pressurization and gravity gravity gravity flow in a head pump station, the mathematical model of the whole system hydraulic transition process is established based on the characteristic line method commonly used in transient flow calculation, and the whole process of pump shutdown water hammer is simulated. In order to solve the problem of negative pressure in the pipeline after power failure of water pump unit, the protection scheme of using air tank behind the pump is put forward, the parameters of air tank are optimized, and the better shape of air tank is determined; A high-level water tank is set at the highest point of the pipeline, and the gravity flow section behind the water tank adopts the mode of series connection of pressure reducing valve and regulating tank for energy dissipation. Under the condition of pump shutdown, in order to avoid empty leakage of the high-level water tank, it is necessary to close all pressure reducing valves. In order to prevent the booster water hammer generated by valve closing from exceeding the pipeline pressure bearing standard, resulting in pipe explosion accident, and considering the influence of water level fluctuation of each regulating tank, different valve closing schemes are selected for comparison. The calculation results show that the preferred volume of the air tank of the project is 15 m3, and the pressure reducing valve is closed in a straight line in 120 s after the pump is stopped. Since the regulating tank is set behind the pressure reducing valve, closing the valve successively and closing the valve at the same time has little impact on the results. The research conclusion provides a reference for the design and safe operation of similar water supply projects.
2022 Vol. 40 (4): 338-344 [Abstract] ( 32 ) [HTML 1KB] [ PDF 1925KB] ( 525 )
345 Chaotic analysis of pressure fluctuation in bulb tubular pump under different flow conditions
SHI Wei,CAI Ruimin,LI Songbai,SUN Tao,CHENG Li*,LUO Can
The vibration source of bulb tubular pump unit is very complex. In order to analyze the vibration law of the unit, the chaotic characteristics of flow field pressure fluctuation were analyzed, and it was pointed out that the vibration characteristics of tubular pump unit originate from the influence of flow field pressure fluctuation. In order to study the chaotic characteristics of pressure fluctuation in the bulb tubular pump under different working conditions, setting up pressure fluctuation monitoring points in impeller, guide vane, bulb wall and flow channel, the chaotic characteristics of pressure fluctuation signals at each monitoring point were analyzed by phase space reconstruction, maximum Lyapunov exponent, phase trajectory, fractal scale and correlation dimension.The results show that the maximum Lyapunov exponent of the pressure fluctuation signal at a specific position in the pump unit is larger than 0, and the signal has chaotic characteristics. Under the three flow conditions, the correlation dimension of the pressure fluctuation signal at the monitoring point at the impeller inlet is between 2.0-2.5, the impeller outlet is between 1.8-2.0, the guide vane outlet is between 1.2-1.5, and generally more than 2.0 in the flow channel. The correlation dimension of different flows conditions is also diffe-rent, the correlation dimension could be used to judge whether the pumps have off design working condition and abnormal hydraulic fluctuation. The conclusions can provide a reference for the prevention and control of abnormal hydraulic vibration of pumping stations.
2022 Vol. 40 (4): 345-352 [Abstract] ( 52 ) [HTML 1KB] [ PDF 4216KB] ( 419 )
353 Pump selection of ultra-low head and large flow tubular pumping station
LI Lingyu
To study the selection of ultra-low head and large flow pump, a tubular pumping station with a design net head of only 0.32 m was taken as an example to predict the pump performance. By using the existing pump model, the similar conversion of pump section characteristic curve and device cha-racteristic curve were compared for this pumping station. After further mathematical deduction, a me-thod of using the characteristic parameters of model pump section to calculate the efficiency of the pump device is proposed. And the results are verified by numerical simulation and model test. The results show that the existing low head pump model in the South-to-North Water Diversion Project can be used to convert for the shaft tubular pump device with operating head below 1 m by reducing diameter and rotational speed. Due to the high proportion of pump channel head loss, the optimal working efficiency of the pump is about 6% lower than that of the pump with about 3 m operating head. The cha-racteristic parameters deviation converted from model device with larger head difference is larger, and the characteristic parameters converted from model pump section is more accurate. The conversion formulas of pump section efficiency and pump device efficiency were used to convert the operating point of pump section curve and the corresponding flow channel loss, which can accurately predict the head range of high efficiency zone in device efficiency curve. The calculation method can be a reference for the design of ultra-low head pumping station in the future.
2022 Vol. 40 (4): 353-358 [Abstract] ( 58 ) [HTML 1KB] [ PDF 2153KB] ( 620 )
359 Experimental study on sediment transport characteristics and velocity of first hub in Yellow River Diversion Irrigation Area
NING Shaoxiong,SUN Yaomin,WU Wenyong,XIAO Juan*,ZHAO Yongan,ZHAO Zhihua
In order to explore the variation law of sediment content and vertical distribution law of suspended sediment along the sand-carrying flow of the Yellow River diversion irrigation project, deduce the critical non silting velocity of harmful sediment suspension in the first project was calculated. The measures and methods to reduce the introduction of harmful sediment were elucidated, so as to improve the utilization efficiency of water transportation and distribution. Taking Zuncun irrigation district in Shanxi Province as the main research object, the sediment content and settling velocity were analyzed by monitoring the water samples of the Yellow River w taken from May to July 2019, the data of working conditions. section velocity, water depth and water surface width. The particle size gradation was analyzed by using the malvern Mastersizer 3000 instrument. The formulas of sand-carrying capacity and uplifting velocity applied to the first junction of Zuncun irrigation area are modified. The results show that there is a positive correlation between sediment content and inflow conditions. The sediment particle size of the Yellow River sediment in Zuncun irrigation area is mainly 0.006-0.200 mm. The siltation in Zuncun irrigation area is closely related to the velocity and particle size of the Yellow River estuary. It is suggested to increase the water delivery distance of the Yellow River estuary before the pump, control the flow rate at about 0.30 m /s, and clear the silt at the inlet. The main channel was scoured regularly at a flow velocity of >2.06 m/s. In actual operation, the working condition of single unit should be controlled at about 7.50 m3/s to reduce the introduction of harmful sediment. The flow velocity in the main channel should be controlled at about 0.42 m/s to achieve the highest water deli-very and distribution efficiency.
2022 Vol. 40 (4): 359-365 [Abstract] ( 42 ) [HTML 1KB] [ PDF 1853KB] ( 394 )
366 Experimental study on influence of canal water on freezing process of canal foundation soil in cold and arid regions
SUN Wen,SONG Ling*,XU Qingfeng,CHEN Xinrui,YANG Yukun
An indoor model test of the water-stop canal and the water-supply canal under the open system was carried out by using the frost-expansion device composed of the cabinet, the cooling space, the water supplement system and the measurement system. The changes of the temperature field of the canal foundation soil, the moisture content after freezing and the replenishment of the Markov flask during freezing are studied. The test results show that the shape of the canal section and the water in the canal affect the distribution of the temperature field of the canal soil, the shape and density of the isotherms of the stop-water canal and the water-supply canal near the trench are different, the tempe-rature field distribution of the canal foundation soil is uneven, the overwater canal only has negative temperature in the foundation soil above the water level line. The cumulative water replenishment vo-lume of the Markov bottle in the water-off canal and the water-passing canal is 16 873 mL and 16 051 mL, respectively. The replenishment of the Markov bottle consists of three stages: rapid replenish-ment, slow replenishment rate and stop replenishment. Compared with the initial moisture content of 17%, regardless of whether there is water in the canal, the value of water content increases after free-zing down from the top of the canal along the slope of the canal. In engineering design and theoretical calculation, the impact of changes in operation mode on canal freezing should be considered separately.
2022 Vol. 40 (4): 366-371 [Abstract] ( 34 ) [HTML 1KB] [ PDF 3367KB] ( 405 )
372 Identification method of abnormal state of hydropower unit based on PCA-GA-BP neural network
LUO Zhengliang,PAN Hong*,ZHAO Lei,TANG Wei,ZHENG Yuan
In order to improve the efficiency and accuracy of the unit abnormal operation identification, a unit abnormal state detection model based on BP neural network optimized by principal component analysis and genetic algorithm was proposed. Taking the real-time sensor data recorded by the unit as a sample, the principal component analysis method was used to reduce the dimension of multidimensional data, and the comprehensive variables were obtained after processing. On this basis, the BP neural network is built and the genetic algorithm was used to optimize the random initial weights and thresholds of the neural network, so as to complete the simulation training of diffe-rent operating states detection models of the units. Finally, taking the real-time monitoring data of each component sensor in the normal and abnormal operating conditions of a power station unit in a continuous period of time as a sample analysis. The proposed PCA-GA-BP algorithm was compared with other optimization algorithms and traditional algorithms, and the feasibility of this method was verified by simulation training experiments with different sample ratios. The simulation results show that: compared with the traditional BP neural network, the model has a relatively shorter average state detection time of 84% and the average detection accuracy is relatively higher by 2.5%. It can achieve abnormal operation of the unit within 0.7-1.0 s on the basis of an average accuracy rate close to 99%. Accurate identification and early warning of abnormal operation of the unit shall be achieved.
2022 Vol. 40 (4): 372-377 [Abstract] ( 41 ) [HTML 1KB] [ PDF 1635KB] ( 419 )
378 Numerical simulation and experimental verification of forward feed array diaphragm rectifier for multi-unit pumping station
ZHANG Xiaowen,LIU Chao*,RONG Yingchun,FENG Xusong,FU Tishan,SUN Yumin
Aiming at the problem of bad flow patterns in the forebay of forward-flow pumping station with multi-units, the flow field in the forebay of pumping station under different start-up conditions was studied by CFD and model test, a method of using array diaphragm as rectifier was put forward, and the effect of array diaphragm as rectifier was evaluated. The results show that there is a large area of circumfluence and vortex in the forebay under three different start-up conditions. The velocity uniformity at the outlet of the forebay is 38.42%-57.39%, and the condition of water inlet of the pump is poor. In order to improve the bad flow pattern in the forebay of forward intake pump station, an array baffle is used to rectify the flow pattern. After adopting the array baffle, the backflow and vortex area in the forebay are reduced and transferred, and the extrusion of the backflow and vortex area to the main stream is obviously weakened. The velocity uniformity at the outlet section of the forebay is increased to 47.23%-63.17%, the water inlet condition of the pump is improved remarkably. The experimental results are in good agreement with the numerical results, and the numerical simulation is verified by the experiment. The research results can provide a reference for the construction and operation of multi-unit forward intake pumping station.
2022 Vol. 40 (4): 378-384 [Abstract] ( 62 ) [HTML 1KB] [ PDF 2550KB] ( 425 )
385 Finite element modeling and analysis of vertical axis composite tidal current energy blade based on ABAQUS
LI Junxiong,WANG Zun*,MA Qiucheng,ZHANG Yaxin,PENG Chaoyi,DENG Hang
In order to explore the influence of composite laminate structure on the mechanical structures characteristics of tidal current energy blades, the fiber-reinforced composite was selected to design the tidal current energy blades, a kind of composite tidal current energy blade with better structure and performance. Two different composite lamination schemes were designed for tidal current energy blades and the finite element model was established by ABAQUS. In one scheme, the laminated fibers at the leading edge of the blade were discontinuous, and in the other scheme, the laminated fibers at the leading edge of the blade were continuous. The mechanical structure characteristics of the two layered structure schemes of the tidal current energy blade under the normal working condition and the extreme working condition were numerically simulated and analyzed to explore the influence of the two layered schemes on the structural performance of the blades. The results show that the continuity of blade leading edge ply fiber can improve the impact resistance of blade leading edge and effectively avoid the failure of blade leading edge ply in operation. Moreover, the strength and stiffness of composite blades can be significantly improved. The results could give a technical suggestion for the development of tidal current energy blades in the future.
2022 Vol. 40 (4): 385-390 [Abstract] ( 58 ) [HTML 1KB] [ PDF 2570KB] ( 579 )
391 Numerical simulation of internal flow in a large-turning fire water cannon barrel with elliptical cross-sectional shapes
XU Jie,YUAN Shouqi,XUE Lin,XIANG Qingjiang*
Taking the largerotation and largeflow fire water cannon barrel as the research object, the computational fluid dynamics software FLUENT was used to numerically calculate the threedimensional steady flow in the fire water cannon barrel with circular crosssection and elliptical crosssection under three flow conditions. By analyzing the hydraulic loss of the fluid in the barrel of different crosssections and the flow pattern of the outlet, the influence rule of the crosssection change on the internal flow of the fire water cannon barrel was obtained. The results show that under the three flow conditions, the hydraulic force of the round crosssection barrel and the noncircular crosssection barrel is hydraulic. The loss difference is small, and the variation range is within 2.7%; the turbulent kinetic energy of the outlet increases with the increase of the elliptical eccentricity of the barrel section, and gradually deviates from the center axis of the pipe; at the exit of the round barrel and noncircular barrel, the positive and negative vortices offset the reduction of vortex flux, the streamline density of the outlet of the round crosssection barrel and the outlet of the vertical ellipse crosssection barrel is more uniform than that of the horizontal ellipse crosssection barrel, and the vertical ellipse crosssection barrel with the same eccentricity is 21% lower than the average exit velocity deviation of the transverse elliptical barrel.
2022 Vol. 40 (4): 391-397 [Abstract] ( 30 ) [HTML 1KB] [ PDF 2386KB] ( 454 )
398 Experimental study on fertilizer effect of Tartary Buckwheat ″3414″ in agricultural area of Lhasa River Valley
BIANBADROLMA*
In order to explore the impact of different fertilization combinations on the yield of Tartary Buckwheat in alpine and dry farming areas and realize the optimal fertilization method and fertilization combination under the goal of optimal yield of Tartary Buckwheat, on the one hand, the yield of Tartary Buckwheat is improved, on the other hand, the application of fertilizer is reduced, so as to reduce the non-point source pollution of farmland. In this study, combined with the planting and fertility cha-racteristics of Tartary Buckwheat in the Lhasa River Valley, the ″3414″ fertilizer effect experiment was made to establish the fertilizer effect equation and explore the best fertilization mode and the optimal fertilizer ratio of Tartary Buckwheat. The results showed that there were significant differences in the yield performance of Tartary Buckwheat by different fertilization modes. Among them, the yield performance of Tartary Buckwheat was the highest under N2P2K3(nitrogen content 34.5 kg/hm2, phosphorus content 36 kg/hm2, potassium content 30 kg/hm2). The analysis of fertilizer interaction effect showed that the interaction effect of N and P was the highest, and the order of soil nutrient limiting yield was N>P>K. Through the analysis of the unitary quadratic fertilizer effect model, the optimal fertilization rates of Tartary Buckwheat were recommended, including urea application rate of 44.5 kg/hm2, calcium superphosphate application rate of 256.17 kg/hm2 and potassium sulfate application rate of 40.82 kg/hm2.

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2022 Vol. 40 (4): 398-403 [Abstract] ( 43 ) [HTML 1KB] [ PDF 1500KB] ( 431 )
404 Prediction of reference crop evapotranspiration in Guangxi Basin by improved Hargreaves-Samani model
（１．四川大学水利水电学院，四川成都６１００６５；２．河海大学农业科学与工程学院，江苏南京２１００９８；３．武汉大学水资源与水电 工程科学国家重点实验室，湖北武汉４３００７２；４．四川省水利学会，四川成都６１００１７；５．河海大学环境学院，江苏南京２１００９８）
Accurate estimation of reference crop evapotranspiration(ET0)is greatly significance for regional water resources management and irrigation decision-making. The Hargreaves-Samani model(HS)is currently recognized as the ET0 estimation model with the simplest structure and highaccuracy. In order to further improve the prediction accuracy of the HS model, the bee colony theory and the data of 20 weather stations in Guangxi Basin(1961—2019)are used to calibrate the HS model globally in this manuscript. The data of 1961—2000 are used to calibrate the HS model, and the data of 2001—2019 are verified on the daily, monthly, and annual scales. The results showed that among the globally optimized empirical parameters C, m and a, the parameter a varies greatly with the topography, while the difference between the parameters C and m is small. The HS model after calibration(average MAE and R2 were 1.06 mm/d and 0.86)was better than the original HS model(MAE and R2 were 2.20 mm/d and 0.68). On the daily, monthly and annual time scales, both the calibrated HS model and the original HS model overestimate ET0, but the calibrated HS model is closer to the ET0 calculated by the PM model. Therefore, in areas only with temperature data, it is recommended to use thecalibrated HS model to estimate ET0.

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2022 Vol. 40 (4): 404-410 [Abstract] ( 55 ) [HTML 1KB] [ PDF 3726KB] ( 554 )
411 Effects of irrigation regulation of rural domestic reclaimed water on soil nutrients in paddy field
CHEN Suchun,HU Jingbo,XIAO Menghua*,HU Xiujun
In order to study the effects of different irrigation water sources and water level regulation on soil nitrogen and organic matter nutrients, three irrigation water sources(rural domestic sewage primary treatment water R1, secondary treatment water R2, river clear water R3)and three irrigation water level regulations(the upper limit of sewage(rain)storage at low water level W1 is 50-70 mm, that at medium water level W2 is 50-100 mm, and that at high water level W3 is 50-150 mm)were selected to meet the requirements of farmland irrigation water quality. The results showed that NH4+-N was the main nitrogen in 0-40 cm soil layer, NO3-N content was low, NH4+-N was relatively stable, and there existed a changing trend of ″as one falls, another rises″, NO3-N was easier to migrate and accumulate with water. Irrigation with primary treatment water of rural domestic sewage can significantly improve the content of soil organic matter. Different water level regulations had significant effect on NO3-N content in 60-80 cm soil layer(P<0.05), and different water source irrigations had significant effect on soil organic matter content in 0-20 cm soil layer(P<0.05). Reclaimed water irrigation can significantly improve the yield of rice, and the average yield of rice under R1 water source irrigation was 1.5% and 14.3% higher than that under R2 and R3 water source irrigations, respectively.
2022 Vol. 40 (4): 411-418 [Abstract] ( 49 ) [HTML 1KB] [ PDF 4386KB] ( 432 )
419 Study on erosion wear resistance of HVOF-sprayed WC-12Co coatings based on Taguchi method
GUO Huafeng*,ZHU Congcong,ZHAO Enlan,LI Longhai,YU Ping,LIU Lei,YANG Haifeng
WC-12Co coating was prepared by high-velocity oxygen-fuel(HVOF)technology. SEM, EDS were used to characterize the micro-morphology, element distribution and chemical composition of the surface/cross section of the coating before and after erosion. The Taguchi Design of Experiments(DOE)techniques and the erosion tester were used to analyze the effects of erosion distance, impact angle and abrasive mass on the erosion rate of the coating, and the erosion mechanism of the coating was discussed. The results show that the microstructure of WC-12Co coating is uniform and there are a small amount of pores. The bonding mode between coating and substrate is mainly mechanical bonding. The range and variance analysis show that under the existing erosion conditions, the erosion distance has the most significant effect on the erosion rate of the coating, followed by the impact angle and the abrasive mass, and the erosion rate is the smallest at the impact angle of 30°, followed by 60°and 90°. Compared with high impact angle, WC-12Co coating has excellent resistance at low impact angle. The erosion mechanism of the coating at the impact angle of 30° is cutting and ploughing damage, accompanied by a small amount of brittle fracture and spalling, and brittle fracture and fatigue spalling caused by positive hammering at 90°. The depth of peeling pit at 90° is much greater than that of cutting and ploughing at 30°, and the damage is more serious.
2022 Vol. 40 (4): 419-426 [Abstract] ( 33 ) [HTML 1KB] [ PDF 8612KB] ( 609 )
427 Finite element hydraulic calculation method and design of thin-wall drip irrigation pipes
WEI Tao,WANG Jian*,YUAN Shouqi
In order to improve the accuracy of the hydraulic design of drip irrigation laterals, a finite element method for calculating the energy loss and irrigation uniformity of thin-wall drip irrigation pipes was proposed. The local head loss was determined by the structure of the emitter, working pressure head and lateral wall thickness. The friction head loss along the lateral was calculated by the modified Darcy-Weisbach formula. A computer program was developed to analyze the head loss and uniformity of different drip irrigation pipes. In addition, the results of the proposed method were compared with those of the recommended calculation method in our country′s Technical Specifications for Micro-irrigation Engineering(GB/T 50485—2009). The results showed that the total head loss hw of the pipeline increased with the increase of the inlet pressure head. With the increase of the emitter spacing, the emitter number and total head loss hw decreased under the same pressure head and lateral length. The hw calculated by the technical specifications was much lower than that calculated by this model, when the emitter spacing was large. When the emitter spacing was small, the results of the recommended method were appropriate. When the working pressure was low, the lateral wall thickness had an obvious impact on the irrigation uniformity, which decreased with the increase in wall thickness and the corresponding decrease in cross section. When the emitter nominal flow rate was low, compared with the pressure head, the wall thickness had a low influence on the design maximum lateral length.
2022 Vol. 40 (4): 427-432 [Abstract] ( 38 ) [HTML 1KB] [ PDF 1564KB] ( 596 )
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