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Journal of Drainage and Irrigation Machinery Engin
 
2022 Vol.40 Issue.12
Published 2022-12-25
1189 Multi-condition optimization design of seawater desalination high-pressure pump based on RBF neural network and NSGA-Ⅱ genetic algorithm
ZHANG Desheng*,ZHANG Qi,ZHAO Ruijie,QI Bing,SHEN Xi
In order to improve the hydraulic performance of the turbine type energy recovery integrated machine, RBF neural network, NSGA-Ⅱ genetic algorithm and numerical simulation integrated optimization design method were used to optimize the design of high-pressure pump under multiple working conditions. In order to do that, the weighted average efficiency at multiple operation was taken as the optimization objective, the head under the design condition was taken as the constraint condition, and the four parameters, i.e., blade inlet angle, outlet angle, outlet width and wrap were selected for the Plackett-Burman test design, and the optimal Latin hypercube sampling method was used to choose the design point in the design space. Besides, based on the Isight multidisciplinary optimization platform, an intelligent hydraulic optimization platform is built by writing batch processing commands to integrate CFturbo, ICEM, CFX, which can achieve automatic CFD prediction of high-pressure pumps. Based on the numerical simulation results, the nonlinear relationship between the objective function and geometric parameters was established using RBF neural network, and the NSGA-Ⅱ algorithm was used to optimize the model. The results indicated that the RBF neural network model could accurately predict the relationship between the head, efficiency and the design variables. Compared with the initial scheme, the weighted average efficiency of the optimized high-pressure pump at three points is improved by 3.38%, more specifically, the efficiency under 0.8Qd,1.0Qd and 1.2Qd is increased by 2.21%,3.59%, 4.23%, respectively, and the shaft power under the design condition is slightly lower than the prototype model. Compared with the flow velocity distribution, streamlines, turbulence energy distribution of the optimized and reference impeller, it is found that the low-speed area at the impeller inlet is reduced, the internal velocity gradient distribution is more uniform, the flow field is significantly improved, and the hydraulic loss of energy dissipation is reduced after optimization. The optimization design method presented in this paper can provide theoretical basis for the hydraulic optimization design of high-pressure pumps under multiple operating conditions.
2022 Vol. 40 (12): 1189-1196 [Abstract] ( 27 ) [HTML 1KB] [ PDF 0KB] ( 586 )
1197 Numerical prediction and analysis of abrasion in a Francis turbine with high sediment concentration
SUN Guoyong,ZHANG Yijun,ZHANG Runqiang,WANG Yuchuan*,MAO Xiuli
To study the abrasion rule of Francis turbine with high sediment concentration, the SST k-ω turbulence model and Tabakoff abrasion model were employed to simulate the multiphase flow and sediment erosion phenomenon in the Francis turbine of Weijiabu Hydropower Station in the Weihe River area. The abrasive areas on different components were predicted and the causes of abrasion were analyzed. Compared with the turbine abrasion after operation of the power station, the numerical simulation results accurately predict the location and degree of abrasion. The numerical simulation results show that the erosion mainly occurs in the irregular boundary areas such as the tongue of the volute, the unsmooth area or gap of the surface-to-surface connection, and the leading edge of the guide vane and blade. The flow pattern near the wall has an important influence on erosion. The most serious erosion damage is the blade area near the down wear ring at the outlet of the impeller, where the curvature of the blade bending is large, forming a high speed and unstable flow phenomenon. The elbow of draft tube changes the flow direction of fluid, which leads to serious abrasion. The research results provide a reference for the prevention of turbine abrasion and the optimal design of anti-abrasion turbine.
2022 Vol. 40 (12): 1197-1203 [Abstract] ( 34 ) [HTML 1KB] [ PDF 0KB] ( 639 )
1204 Cavitation characteristics of axial-flow pump based on modified partially-averaged Navier-Stokes model
YU Yunyun*,ZHOU Daqing,YU An,LIU Jiajia
In order to study the cavitation problem of axial flow pumps, the secondary development technology of CFX software was used to modify the turbulence model, and realize the dynamic definition of the parameter fk in the PANS model by writing CCL language, so that it can be defined according to local grid conditions and turbulence lengths. The revised turbulence model was used to numerically calculate the cavitation in the entire flow channel of the axial-flow pump. According to the calculation results, the critical NPSH of the axial flow pump was 5.37 m. The test shows that the actual critical NPSH is 5.68 m, and the error between the two is caused by the test conditions and the test system, and is within a reasonable range. And the reliability of the turbulence model in the cavitation calculation of the axial flow pump was also verified by taking the cavitation diagram in the test. By analyzing the numerical calculation results, the cavitation characteristics of the axial flow pump under different working conditions were obtained. As the decrease of NPSH, the volume fraction of cavitation in the impeller of the axial flow pump increases, the vorticity increases, and the surface pressure and flow velocity of the blade fluctuate correspondingly at the position where the cavitation occurs and collapses. With the increase of flow rate, the critical NPSH of axial flow pump decreases, the overall amount of cavitation distribution becomes larger, the value of turbulent kinetic energy inside the impeller becomes larger, and the turbulent flow dissipation becomes serious, which is directly related to the occurrence and collapse of cavitation.
2022 Vol. 40 (12): 1204-1211 [Abstract] ( 32 ) [HTML 1KB] [ PDF 0KB] ( 730 )
1212 Experiment of pressure pulsation of vertical inline centrifugal pump under different working conditions
CHEN Jinwei,PEI Ji*,WANG Wenjie,DENG Qifan,WANG Zhongsheng
In order to research the pressure pulsation characteristics of vertical inline centrifugal pump under different conditions, the test was conducted by applying a dynamic frequency pressure sensor system under 4 different operating conditions, and the monitoring points of pressure were located on the inlet pipe and the volute. Both frequency and time-frequency characteristics were investigated in the experiment. The results show that the pressure pulsation at each monitoring point has a certain periodi-city. The amplitude of pulsation is the highest near the volute tongue. As the flow rate increases, the amplitude of each monitoring point first decreases and then increases. Except under 1.4Qd condition, the dominant frequency of pressure pulsation at the inlet pipe is 2 times the shaft frequency, and the amplitude exhibits strong fluctuation characteristics. The dominant frequency of pressure pulsation at the volute tongue is of blade passing frequency, and its amplitude increases as the flow rate increases. It shows wide frequency volatility at high frequency under 0.6Qd and 1.0Qd. The dominant frequency of the pressure pulsation at the volute diffuser is of blade passing frequency under 0.6Qd and 1.0Qd, and the main frequency under overload conditions is of shaft frequency. The amplitude of shaft frequency decreases as the flow rate increases.
2022 Vol. 40 (12): 1212-1218 [Abstract] ( 22 ) [HTML 1KB] [ PDF 0KB] ( 579 )
1219 Numerical study on influence of elbow installation angle on pressure fluctuation in pipeline pump
WANG Yefu,WANG Yang,SONG Jianlong,JIN Shibin,GONG Xuran,ZHU Rui,CAO Puyu*
To explore the influence of the relative circumferential position of the inlet elbow and volute on the hydraulic excitation in the centrifugal pump, a vertical centrifugal pipeline pump with elbow suction chamber was taken as the research object, and six groups of pump models with different circumferential installation angles were refitted based on the research object for numerical simulation. During the numerical calculation, the main body monitors the pressure fluctuation in the impeller region, and then the pressure fluctuation characteristics of the refitted pumps and the prototype pump in the impeller rotating region were compared and analyzed. The results show that in the inlet basin of the impeller, when φ=45°, the peak phase is advanced obviously in time domain, which counteracts with the trough of secondary vortex pair excitation and weakens the peak, with the maximum decrease of 40.6%. In the middle part of the impeller, the installation angle has a great influence on the pressure fluctuation at the back of the blade. In the blade trailing edge, the influence of different elbow installation angle decreases from impeller inlet to blade trailing edge. This study can provide some reference for the actual installation and optimization of pipeline pump.
2022 Vol. 40 (12): 1219-1226 [Abstract] ( 35 ) [HTML 1KB] [ PDF 0KB] ( 582 )
1227 Effect of width-to-diameter ratio of impellers on waterwheel performance based on volume of fluid model
LI Kexin,ZHENG Yuan*,HU Xueyuan
In order to study an eco-friendly and simple waterwheel device with a micro water head, a three-dimensional model of the waterwheel in the river was established. The volume of fluid(VOF)model was used, and the pressure-velocity coupling was solved in the PISO format. The width-to-dia-meter ratio of different impellers was calculated. Unsteady flow analysis was performed on the waterwheels. The results show that the chest shot waterwheel with an impeller width-to-diameter ratio of 3.93 has the widest efficiency zone and the highest optimal efficiency. The increase in the width-to-diameter ratio of the impeller increases the blocking effect of the flow channel, and the water level diffe-rence between the upstream and downstream increases, and the obvious vortex phenomenon appears.Torques of waterwheel blades with different width-to-diameter ratios show the same periodic change,when the waterwheel is running in the dry season, there will be a backflow phenomenon between the two blades immersed in the water during the movement of the blades, so that the torque has a small range of extreme values. The pressure between the two blades that are not immersed in water increases as the width-to-diameter ratio of the impeller increases. The front pressure of the waterwheel blades of five width-to-diameter ratios reaches the maximum at the tip of the blade, and the waterwheel with an impeller width-to-diameter ratio of 3.93 has the largest pressure difference between the front and back sides of the waterwheel blades, which improves the blade′s performance. The results play a gui-ding role in the design of the impeller structure of the chest shot waterwheel.
2022 Vol. 40 (12): 1227-1232 [Abstract] ( 22 ) [HTML 1KB] [ PDF 0KB] ( 611 )
1233 Multi-objective optimizationallocation of regional water resources based on NSGA-Ⅲ algorithm and TOPSIS decision
ZHAO Qin,BAI Qingjun*,NIE Kunkun,WANG Han,ZENG Xuemei
In order to alleviate the tight supply and demand of water resources and guide the management of regional water resources, the optimal allocation model of regional water resources was constructed with the two-way constraints of water supply and water demand, aiming at the comprehensive deve-lopment of society, economy and ecology. According to the characteristics of the model, NSGA-Ⅲ algorithm was introduced to solve the model to find the Pareto front surface and the optimal solution set. In the face of many feasible Pareto solutions, TOPSIS decision theory was introduced to comprehensively evaluate different solutions, and the tradeoff solution was chosen as the best compromise solution. The model was applied to the Yahekou irrigation area of Nanyang City to verify the optimal allocation of water resources in the short-term and long-term horizontal years under the water inflow frequency of P=75%, and the balance of supply and demand of secondary water resources was analyzed. Compared with the basic scheme, the configuration results show that the annual residual water volume of the compromise scheme increases to 114.97 million m3 at the recent level, and the water resource can be saved by 32.72 million m3.The long-term level of water shortage has changed from 42.79 million m3 to 39.5 million m3, which can save 82.29 million m3 of water. The water-saving effect is obvious, basically in line with the overall planning and water demand of the Yahekou irrigation area.
2022 Vol. 40 (12): 1233-1240 [Abstract] ( 23 ) [HTML 1KB] [ PDF 0KB] ( 628 )
1241 Hydraulic characteristics of spring platetype measuring device in open channel
WAN Li,LI Yongye*,ZHANG Gang,CAI Hongru,ZHANG Xuelan,YANG Xiaoni
In order to improve the accurate water measurement technology in irrigation areas, a flow measurement device for open channel was designed based on the relationship between spring shape va-riable and instantaneous flow of channel water cross section. The model test of the device was conducted in a rectangular channel with a selected flow range of 20-85 m3/h under 14 flow conditions. The theoretical analysis and numerical simulation were combined to analyze the flow equation, flow measurement accuracy, head loss and other measurement characteristics of the device. The research results indicate that the instantaneous flow rate Q of the channel overflow section shows a 5/6th power relationship with the sum of the shape variable d and parameter C1, and the linear correlation between Q and the 5/6th power of d+C1 is good when the width of the measuring plate is 30, 40, 50 and 60 mm. The flow rate formula of the spring-plate flow measuring device was obtained by fitting, the calculated flow rate was consistent with the measured flow rate during the test, the maximum relative error was 4.56%, and the maximum relative error was 1.43% when the plate width was 40 mm. The maximum relative error between the simulated and measured water levels is 4.54%, and the simulated results agree with the measured ones; the head loss generated by the measuring plate increases with the increase of the plate width, and the head loss accounts for less than 10% of the total head when the plate width is less than 40 mm. The research results provide a theoretical basis for the application of spring-loaded plate flow measurement device in irrigation areas.
2022 Vol. 40 (12): 1241-1247 [Abstract] ( 26 ) [HTML 1KB] [ PDF 0KB] ( 570 )
1248 Long-distance water hammer protection of pipeline after pump being first lowered and then raised
DU Chang,LIU Xiyuan,ZHANG Jian*,Wang Baoluo,CHEN Xuyun,YU Xiaodong
The long-distance water transmission system of the long-distance water transmission system after the pump is prone to negative pressure when the pump is de-energized. a pump-stop water hammer protection scheme of pressure regulating tower combined with end regulator valve was proposed, and a mathematical model of the hydraulic transition process was established based on the characteristic line method of transient flow calculation to simulate the whole process of pump-stopping water hammer. Combined with the actual project, the minimum area of the pressure regulating tower of the conventional pressure regulating tower protection scheme was explored, and the parameter selection principle of the water hammer protection scheme of the pressure regulating tower set after the pump combined with the end regulator valve linkage was given, and the influence of the water hammer protection scheme of the conventional scheme and the water hammer protection scheme of the pressure regulating tower set behind the pump combined with the end regulator valve linkage closure on the water hammer of the pump was stopped. The results show that the area of the conventional scheme voltage regulating tower is 1 100 m2. The protection scheme of the pressure regulating tower combined with the lin-kage closing of the end regulator valve will cause the pipeline positive pressure to be too large, while it closes so slow as to lead to insufficient water flow return capacity of the pipeline, select the appropriate end regulator closing time, under the premise of meeting the system water hammer protection standards, the area of the pressure regulating tower can be effectively reduced.
2022 Vol. 40 (12): 1248-1253 [Abstract] ( 31 ) [HTML 1KB] [ PDF 0KB] ( 556 )
1254 Influence of airfoil and installation elevation of hyperboloid agitator on mixing performance
SHI Junfeng,ZHENG Yuan*,ZHANG Haisheng,GUO huajuan
NX software was used to establish the solid model, and Fluent 18.0 software was used to analyze the three-dimensional turbulence. Through unstructured grid and moving coordinate system technology, standard k-ε turbulence calculation model and SIMPLEC algorithm were used to solve the velocity pressure coupling problem. On the basis of the original hyperbolic agitator airfoil, the blades were superimposed horizontally, and the mixing flow field of the hyperboloid agitator in the oxidation tank of 9 m×9 m×5 m under the two airfoils was calculated. The flow field near the blades of the hyperbolic stirrer before and after optimization and the turbulent kinetic energy change in the specific area under different installation heights were compared and analyzed. The blade extension line of hyperbolic stirrer was helix. The research and calculation show that the upstream surface of the blade is the surface directly impacting with the incoming flow, and the optimal one is the concave side of the spiral line and at an acute angle with the turntable; the optimal back water surface is the vertical plane perpendicular to the turntable; and adding an inclined plane behind the back surface can rectify the accelerated water body and make the radial mixing range of the agitator wider. When the installation elevation is h=1 000 mm, the average velocity in the pool reaches 0.710 m/s, which is 0.140 m/s higher than that before optimization, and the average turbulent kinetic energy reaches 0.088 J/kg and 0.043 J/kg respectively. The average turbulent kinetic energy of main areas increases from 0.015 J/kg to 0.028 J/kg.
2022 Vol. 40 (12): 1254-1260 [Abstract] ( 26 ) [HTML 1KB] [ PDF 0KB] ( 553 )
1261 Double spray guns technology of energy saving and quality guaranteed hard hose traveler
LIU Yichuan,ZHANG Rui,ZHU Delan,*,GE Maosheng,GAO Fei,ZHAO Haiqing,
In order to solve the problem of high working pressure required for single-gun irrigation on reel-type sprinkler irrigation machines, double spray guns for combined irrigation was proposed to use. Experiments were carried out on the mobile spraying water distribution of double and single spray guns under different working pressures to compare and analyze the irrigation uniformity of the two spray guns under different round irrigation combinations. The results show that when the wor-king pressures of double and single spray guns are 0.10 and 0.25 MPa, the spraying widths are 45.08 and 45.60 m, respectively. When the two spray guns are combined with 1.5 times the spraying radius of the nozzle car, the combined uniformity is 81.72 and 80.36%, respectively, and the spraying effect is basically the same. Using the equivalent annual value method to compare the initial investment, energy consumption and annual operating costs of the two spray guns, it is found that under this working condition, the initial investment, energy consumption and annual operating costs of double spray guns are 27.45, 77.58 and 105.04 yuan/hm2 respectively, those of single spray guns are 12.95, 193.96 and 206.91 yuan/hm2. Although the initial investment of double spray guns has increased slightly, its energy consumption and annual opera-ting costs are reduced by 60.00% and 49.23% respectively compared with single spray guns. Therefore, spraying with double spray guns can reduce working pressure, energy consumption and annual operating costs while ensuring the quality of spraying.
2022 Vol. 40 (12): 1261-1267 [Abstract] ( 24 ) [HTML 1KB] [ PDF 0KB] ( 648 )
1268 Effects of Microcystis aeruginosa decay on migration of antimony and arsenic in surface sediments
HUANG Tianyin*,ZHU Tian
To explore the effects of Microcystis aeruginosa(M. aeruginosa)on the water environment and the migration of arsenic(As)and antimony(Sb)in sediment,the column of sediment and over-lying water was employed as the research object to monitor the change of environmental factors and substance concentrations during the decay of algae with different concentrations, and analyze the effects of algae on the migration of As and Sb in sediments. The results show that the dissolved oxygen and electric potential in overlying water are both obviously decreased which benefited the dissolution of sediment. The algae cells penetrating into sediment promotes the migration of As and Sb from sediment to pore water, and the release rate reaches the maximum on the second day after adding Microcystis aeru-ginosa. The maximum release rate of As occurs at -4 cm in the sediment in both low algae dosage co-lumn(LAD)and high algae dosage column(HAD)with value of 2.20 and 3.67 respectively, while the maximum release rates of Sb occurring at -2 cm in the sediment with rate of 1.01 and 1.21 in LAD and HAD. It is inferred that the release of As and Sb is mainly caused by the dissolution during intaking nutrients from sediment by algae cells. The decay of algae turns the water environment into reductive condition which promotes As release with the rate of 0.82 and 1.58 in LAD and HAD respectively, but inhibites Sb release due to the solidifying form of reductive Sb, with release rate of 0.13 and 0.12 in LAD and HAD respectively. Algal activity in HAD exhibites a stronger effect on the migration of As and Sb. The research indicates that algal activity has an effect on the migration of As and Sb in sediment, which provides the basis of control of heavy metals in eutrophication water.
2022 Vol. 40 (12): 1268-1274 [Abstract] ( 30 ) [HTML 1KB] [ PDF 0KB] ( 526 )
1275 Effects of groundwater depth and nitrogen application rate on grain filling and water and nitrogen use efficiency of winter wheat
BAI Fangfang,LI Ping,QIAO Dongmei,QI Xuebin,Symbolj@@,GUO Wei,MA Cancan,DU Zhenjie
In order to investigate the effects of groundwater depth and nitrogen application rate on grain filling characteristics and water and nitrogen use efficiency of winter wheat in North China, taking Bainong 4 199 as experimental material, groundwater depth(GW2: 2 m, GW3: 3 m, GW4: 4 m)and nitrogen application rate(N300: pure nitrogen: 300 kg/hm2, N240: pure nitrogen: 240 kg/hm2)were set to evaluate the effects of groundwater depth and nitrogen application rate on winter wheat yield formation, grain filling characteristics and water and nitrogen use efficiency. The results show that the 1 000-kernel weight of winter wheat was significantly positively correlated with turning point t2, the average grain filling rate Gmean and the grain filling duration P. Path analysis showed that groundwater depth mainly affected wheat yield by influencing grain weight per plant, spike number and kernels per spike, the direct standardized path coefficient of groundwater depth on yield was 0.334(P<0.05), and nitrogen application rate indirectly affected wheat yield by influencing grain weight per plant and spike number. At the same groundwater depth, NPP and WUE of N240 application rate were significantly higher than those of N300 application rate. Therefore, the nitrogen application rate of 240 kg/hm2 is recommended for winter wheat high yield and green and sustainable agricultural development.
2022 Vol. 40 (12): 1275-1283 [Abstract] ( 28 ) [HTML 1KB] [ PDF 0KB] ( 536 )
1284 Effect of salinities and sodium adsorption ratio of irrigation water on infiltration and distribution of water and salt under gravel-sand mulching
DONG Lixia,TAN Junli,Symbolj@@,LI Miao,LI Cunyun,WANG Xina
A series of soil column experiments were carried out to investigate the effects of salinities and sodium adsorption ratios of irrigation water on soil water infiltration process and the distribution of soil moisture and salt under gravel-sand mulching. Treatments included 4 salinities of irrigation water(1.0, 2.5, 5.0 and 7.5 dS/m)with CK of deionized water(EC=0 dS/m)and 4 sodium adsorption ratios(SAR=3.9, 7.0, 12.7, 22.7(mmol/L)0.5). Results showed that the cumulative wetting front was improved and the cumulative infiltration volume decreased as salinity of irrigation water increased. Compared with deionized water(EC=0 dS/m), the cumulative wetting front increased by 7.0%, and the average soil moisture content decreased by 36.0% with irrigation water salinity of 7.5 ds/m. The cumulative wetting front and cumulative infiltration volume increased first and then decreased with the increase of SAR of irrigation water and the influence of SAR of irrigation water on soil moisture in the profile was little. Salt content in the upper soil increased with the increase of salinity of irrigation water as a positive power function, while there was no obvious relationship between soil salt content and SAR of irrigation water. Soil pH was improved greatly with the increase of SAR of irrigation water.
2022 Vol. 40 (12): 1284-1289 [Abstract] ( 26 ) [HTML 1KB] [ PDF 0KB] ( 559 )
1290 Applicability evaluation of tea plant evapotranspiration models in hilly area of southern Jiangsu Province
NI Yuxin,ZHANG Chuan,YAN Haofang,ZHANG Wencheng,ZHOU Junan,XUE Run
Based on the ETc data measured by Bowen ratio energy balance method from 2017 to 2020, the parameters of crop coefficient(S-kc)model and Priestley-Taylor(PT-α)model were detemined and modified respectively. The response characteristics of ETc to meteorological factors in each growth period were analyzed. And the applicability of the modified models to simulate ETc in tea plants in southern Jiangsu was evaluated. Results show that crop coefficient kc of S-kc model is 0.83, 1.19 and 1.06 at the early, middle and late growth periods, respectively, and the annual mean value of PT-α model coefficient α is 1.09. The meteorological factors Ta, VPD and VWC are significantly correlated with ETc. The overall meteorological factors and ETc are highly correlated in the middle growth period and less correlated in the late growth period. The S-kc model overestimates ETc measured by Bowen ratio energy balance method as a reference, and PT-α model underestimates ETc. While the error of PT-α model(R2=0.88)is lower than that of S-kc model(R2=0.91). The precision of the PT-α model is higher in the rapid growth period(MAE=0.72 mm/d, RMSE=0.99 mm/d)and the late growth period(MAE=0.35 mm/d, RMSE=0.23 mm/d), and the precision of S-kc model is higher in the middle growth period(MAE=0.36 mm/d, RMSE=0.48 mm/d).The results of this study indicate the variation characteristics and methods of ETc in whole growth. It is of great reference value to the scientific production of tea trees in hilly areas of southern China.
2022 Vol. 40 (12): 1290-1296 [Abstract] ( 32 ) [HTML 1KB] [ PDF 0KB] ( 578 )
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