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Journal of Drainage and Irrigation Machinery Engin
 
2023 Vol.41 Issue.11
Published 2023-11-25
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2023 Vol. 41 (11): 1- [Abstract] ( 3 ) [HTML 1KB] [ PDF 21179KB] ( 151 )
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2023 Vol. 41 (11): 2- [Abstract] ( 4 ) [HTML 1KB] [ PDF 1107KB] ( 104 )
1081 Influence of guide vane on flow characteristics of Pelton turbine injector
ZHAO Daoli*,DENG Xiaofei,SUN Weipeng,GUO Pengcheng
In order to explore the influence of the guide vanes on the flow characteristics of the injector, 7 different guide vane numbers and 5 different guide vane outlet angles were designed. In these schemes, the RNG k-ε and VOF models were used to numerically calculate the injector of the Pelton turbine considering the inlet of the elbow under rated conditions, and analyze the influence of the guide vane on the flow characteristics of the injector. The results show that the Dean vortex caused by the inlet elbow and the Karman vortex caused by the flow around the guide vanes always exist inside the injector and the jet region. The existence of these vortices causes the jet liquid surface to deform inside the elbow and downstream of the guide vane, and causes the jet diffusion. There are differences in the jet eccentricity of the injector with different numbers of guide vanes. The number of guide vanes increases, the phenomena of liquid surface bulge inside the jet and the jet diffusion are alleviated. However, the deformation of the corresponding area of the jet liquid surface downstream of the guide vane is more severe, which again affects the jet quality. The change of the outlet angle of the guide vanes has a certain influence on the stretched vortex caused by the guide vanes, but compared with the number of the guide vanes, the outlet angle of the guide vanes has less influence on the flow characteristics of the injector.

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2023 Vol. 41 (11): 1081-1087 [Abstract] ( 9 ) [HTML 1KB] [ PDF 7359KB] ( 164 )
1088 Impeller pressure pulsation and internal flow law of reactor coolant pump during idling process based on wavelet transform
LIU Anlin,YE Daoxing,*,LUO Yimin,CHEN Junlin,YU Bo,LAI Xide,WU Jinchen,ZHAI Fengli
In order to study the flow law in the reactor coolant pump during idling process, the numerical simulation method was used to calculate the internal flow field of the reactor coolant pump, and the time-frequency characteristics of pressure pulsation in the impeller channel with different idling flow time(TQi)were obtained. The pressure pulsation of the impeller was analyzed by wavelet transform, and the vortex identification of the flow components under different working conditions was carried out by using the second generation vortex identification method Q criterion. The results show that the maximum change of pressure fluctuation coefficient occurs in the middle of the guide vane at the initial stage of idling process, then the maximum change rate occurs at the dynamic and static interface between the impeller and the guide vane, and finally the pressure fluctuation tends to be stable. With the decrease of impeller speed and flow rate, the work area of the guide vane moves to the vicinity of the outlet. Due to the special structure, the tongue part is greatly impacted, and there is backflow nearby, mean while and there is a sign of diffusion to the middle of the flow channel. The pressure pulsation tends to be stable, and the main frequency shifts to the low frequency. The pressure pulsation regularity in the flow channel of each component is gradually destroyed, and the change trend of the guide vane flow channel is relatively gentle. Some of the strong vortex regions in the channel indicates of separation and shedding, and the number gradually decreases. The vortex core in the pumping chamber is mainly concentrated on the left side, which is related to the rotating direction of the impeller. The research can provide some support for the optimization design of the idling characteristics of the reactor coolant pump.
2023 Vol. 41 (11): 1088-1095 [Abstract] ( 12 ) [HTML 1KB] [ PDF 4130KB] ( 171 )
1096 Unsteady flow and vibration characteristics in micro high-speed fuel pump
WANG Weijun*,DAI Yongbo,TAN Xiangjun,WU Dazhuan,WANG Liwen,CHEN Dong
A three-dimensional model of a micro high-speed fuel pump was taken as the research object, the SST k-ω turbulence model, PCB 352C33 acceleration sensor and analysis software(DASP-V11)were used as the analysis tool. Based on numerical calculation and experimental methods, the internal pressure, velocity, turbulent kinetic energy under steady conditions, radial force, axial force, pressure pulsation at monitoring points and vibration acceleration in X, Y and Z-axis were obtained respectively. The frequency domain diagram of monitoring points and three axes were obtained by fast Fourier transform. The results show that the numerical results of SST k-ω turbulence model and blade surface densification are consistent with the experimental results. The Y + of blade surface is 0-2.00 and the Y+ of the volute wall is 0.03-25.58. Like the conventional centrifugal pumps, there is an obvious flow separation and turbulent energy dissipation areas in the impeller and volute under the condition of small flow rate. In unsteady flow, the components of radial force in X and Y directions have no obvious periodicity, while the periodicity of axial force is equal to the number of blades. The monitoring points in the rotor-stator interaction area of the volute and impeller show obvious periodicity. The pressure fluctuation amplitude is 960 Hz at the blade frequency, while the vibration amplitude of vibration artery is 1 920 Hz. The vibration amplitude of Z-axis is higher than that of the other two axes. The research results provide a theoretical basis for the optimization design of unsteady flow in high-speed fuel pump.
2023 Vol. 41 (11): 1096-1103 [Abstract] ( 11 ) [HTML 1KB] [ PDF 5283KB] ( 162 )
1104 Performance of valveless piezoelectric pump with built-in mixer
XIE Yuzhe,SUI Rendong,CHI Junkang,HU Xiaoqi,CHEN Feng,JI Jing,HU Caiqi*
In order to achieve the sufficient mixing of different fluids in the process of conveying fluids, three built-in mixer types piezoelectric pumps were designed, including baffle built-in mixer, resistive fluid built-in mixer and winding fluid built-in mixer. The finite element analysis software COMSOL multiphysics was used to numerically simulate the mixing effect of the flow field of piezoelectric pumps, the mixing concentration of a typical cut of the flow was extracted and calculated, and the reliability of the numerical simulation of the mixing degree was verified by the experiment. At the same time, the effect of the built-in mixer on the pumping capacity of the piezoelectric pump was also studied. The results show that the built-in mixer has a significant effect on the mixing ability of the piezoelectric pump. The different structures and parameters of the built-in mixer have a large impact on the mixing degree. The mixing degree of the fluid-wound built-in mixer piezoelectric pump with six mixing units can reach 99.35% when the driving frequency is 727 Hz and the driving voltage is 150 V. Meanwhile, the pumping flow rate of the piezoelectric pump without built-in mixer is 457.3 mL/min, and the piezoelectric pumps with built-in mixer has different degrees of flow loss. The experimental results further verify the correctness of the simulation analysis, and it provides a reference for the study of the hybrid and pumping performance of piezoelectric pump.
2023 Vol. 41 (11): 1104-1110 [Abstract] ( 4 ) [HTML 1KB] [ PDF 2151KB] ( 114 )
1111 Influence of main control parameters of skip-shaped water inlet channel on hydraulic performance
GAO Chuanchang,GAO Yuxin*,DONG Xumin,GAO Zhikai
In order to investigate the influence of the main control parameters of the skip-shaped inlet flow channel of the downstream Xingjiadu Yellow River Diversion Gate Pumping Station on the hydraulic performance, the N-S equation for three-dimensional incompressible fluid, the RNG k-ε model and the SIMPLEC algorithm were used to conduct three-dimensional turbulent numerical simulations on the influence of five control parameters, including the inlet height of the flow channel, the length of the flow channel, the height of the suction chamber, the inlet diameter of the flapper pipe and the inclination angle of the bottom of the flow channel, were numerically simulated. The relation among the flow rate distribution uniformity, the velocity weighted average angle and the hydraulic loss of the channel and the flow rate was analyzed under different control parameters. The results show that the height of the suction chamber and the inlet diameter of the horn tube have significant influence on the uniformity of the velocity distribution, while other control parameters have little influence. The value of different control parameters has a significant influence on the hydraulic loss of the flow passage, and it gradually increases with the increase of flow. The optimal hydraulic performance control parameters are proposed as follows: the inlet height of the channel, the length of the channel, the height of the suction chamber and the inlet diameter of the inlet horn tube are 1.51, 3.50, 0.80 and 1.50 times of the impeller dia-meter, respectively, and the bottom inclination angle of the flow channel is 0 degrees. The results of the study can be used as a reference for similar engineering designs.
2023 Vol. 41 (11): 1111-1118 [Abstract] ( 9 ) [HTML 1KB] [ PDF 2341KB] ( 140 )
1119 Optimization of rectification for forebay and suction chamber of parallel circulation pump station
WANG Weishu*,ZHEN Juan,GUO Jiawei,ZHAI Yuxin,HE Youcai,HUANG Xing
For solving the stubborn vibration problem of circulation pumps in large thermal power plants, numerical simulation methods were used to study the vibration of pumps. Multiple rectification schemes had been proposed to improve the bad flow pattern of the forebay and suction chamber. The Reynolds time averaged Navier-Stokes equations and Realizable k-ε turbulence model were used to perform the numerical simulation. The 3D flow was simulated under the original working condition by Fluent. The flow pattern of different rectification schemes was also simulated by Flunet. Appropriate rectification engineering measures were analyzed and selected. The simulation results show that the irregular design of the arc-shape water inlet channel and the rectangular forebay are triggering the high-speed water flow areas and the adhering to the wall, which are the main reasons giving rise to vibrate in the circulation pump. To eliminate the stubborn vibration problem of the circulation pump, the rectification measures of the arc-shaped current sharing plate can nice improve the flow patterns around the entire forebay suction chamber and bell mouth. Meanwhile, the high-speed water flow area in the forebay is reduced by the rectification measures, the wall biased flow phenomenon basically disappears in the suction chamber, and the flow pattern is uniform in the bell mouth area. The inlet condition of the circulation pump is uniform. Field tests prove that the implement of rectification measures is efficacious, the vibration of pump units is obviously eliminated, the operating efficiency of the circulation pump has also been improved. The research results can provide reference for similar engineering examples.

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2023 Vol. 41 (11): 1119-1126 [Abstract] ( 5 ) [HTML 1KB] [ PDF 11514KB] ( 183 )
1127 Hydraulic interference in low head water conveyance and power generation systems with multi-node surge chamber
CAO Linning*,XIONG Dou,WU Daoke
For water delivery systems with special channel arrangements such as single pipe, single machine, and multi node surge chambers, surge chambers are usually set up to meet the requirements of regulating and ensuring the calculation of large fluctuation control values and stable operation of small fluctuations. Due to the mutual flow of water in the large well of the surge chamber, hydraulic connections between the units are inevitable. In order to deeply study the hydraulic interference phenomenon in this kind of hydropower system, based on the data of the expansion project of a power station, and the method of characteristics of the pressurized water delivery system, a multi node surge chamber model was introduced to analyze the impact amplitude of hydraulic interference according to different surge chamber locations, different regulation modes and other factors. At the same time, the transient process simulation calculation was carried out for the two typical hydraulic interference conditions of single unit load rejection and single unit startup load increase, and the unit output and surge chamber water level fluctuation data were obtained. According to the unit output fluctuation at different surge chamber positions, the impact amplitude of hydraulic interference was analyzed, and the measures to improve the regulation quality of units in the hydraulic interference transient process were proposed, which provided a reference for similar hydropower systems.
2023 Vol. 41 (11): 1127-1132 [Abstract] ( 9 ) [HTML 1KB] [ PDF 1927KB] ( 118 )
1133 Overflow capacity and fitting analysis of right-angle polyline weir with different weir length variations
ZHOU Xinyu,QIU Yong*,GUO Jinnan,YANG Changwen,HUANG Zihan
In order to explore the overflow capacity of each part of the right-angle broken line weir(front weir, side weir and back weir)when the length of the weir body changes under free outflow conditions, a mathematical model of a right-angle polyline weir was established by FLOW-3D software. The RNG k-ε turbulence model and the TruVOF free surface tracking method were used to calculate the data of nine groups of right-angle polyline weirs with different lengths and positions of the side weirs. Furthermore, the changes law of the overflow capacity of the front, side and back weirs under the same head conditions was analyzed. The results show that with the increase of the length of the side weir, the overflow capacity of the side weir increases, however the increase relatively slows down. Meanwhile, the overflow capacity of the front weir and the back weir decreases, but the decrease range in capacity of the back weir is bigger than that of the front weir. With the change of the side weir position(the length of the front weir increases and the length of the back weir decreases), the overflow capacity of the side weir increases, showing a trend of first increasing and then decreasing, while the overflow capacity of the front weir and the back weir has a non-linear positive correlation with their own length. On this basis, the flow calculation equation for different weir lengths at the leading edge of the overflow under the change of relative head at the top of the weir is fitted. It is concluded that the maximum overflow capacity is reached when the side weir of the right-angle polyline weir is located at 0.45 times the channel width, and the increase of overflow capacity tends to level off when the side weir length of the right-angle polyline weir reaches 1.30 times the channel width.
2023 Vol. 41 (11): 1133-1141 [Abstract] ( 11 ) [HTML 1KB] [ PDF 4950KB] ( 143 )
1142 Effect of lithium slag on mechanical properties of cement composite soil
CHEN Sili,ZHOU Yuwan*,LIU Liwen,CHEN Zhi
With the rapid development of the lithium salt industry, the accumulation of lithium slag is also increasing. In order to promote the comprehensive utilization method of lithium slag, lithium slag is used as an admixture on the cement composite soil without side limit compressive strength and three-axis compression test. Lithium slag dosage on the cement composite soil compressive strength, stress-strain, shear strength, cohesion and internal friction angle of cement composite soil were analyzed. Moreover, the mechanism of action of lithium slag on the mechanical properties of cement composite soil was analyzed by using the SEM method. The results show that when the amount of lithium slag is 12%, the unconfined compressive strength of cement composite soil is increased by 85.1% compared with 0% of lithium slag. The stress-strain relationship curve of lithium slag cement composite soil shows a softening type. The brittleness becomes more apparent with the increase amount of lithium slag and the shear strength, cohesion and internal friction angle increase in direct proportion to the amount of lithium slag doped within a certain range. With the increase of confining pressure, its ductility becomes more obvious. The SEM test results show that lithium slag can improve the internal structure of cement composite soil and enhance its compactness. The experimental results provide certain technical parameters and theoretical references for the design and construction of lithium slag in cement composite soil.
2023 Vol. 41 (11): 1142-1147 [Abstract] ( 5 ) [HTML 1KB] [ PDF 2261KB] ( 132 )
1148 Influences of special structural parameters of spiral groove on vaporization characteristics and performance of sealing lubrication film
CHEN Huilong,CHEN Yingjian*,FU Yanxia,WEI Zepeng,CHENG Qian,SHI Dichao,LIU Ruirui
In order to understand the influence of helical groove shaped structural parameters on the vaporization characteristics and performance of sealing lubrication film, a sealing lubrication film vaporization calculation model involving the relationship between saturated steam pressure and temperature, viscosity temperature effect and fluid internal friction effect was established. The vaporization characteristics and sealing performance of lubrication film for spiral groove, Z-groove and goose groove seals were compared and investigated. The results show that liquid film vaporization mainly occurs in the channel weir area and the nearby dam area. The outer groove root circumferential groove of Z-groove and wild goose groove has the function of pressure storage, while the inner groove root circumferential groove of Z-groove has a cavitation inhibition effect in the groove area. The opening force of Z-groove seal is significantly higher than that of the goose groove seal and spiral groove seal, and the opening force of goose groove seal is slightly better than that of spiral groove seal. The lubrication film of Z-groove seal has the lowest degree of vaporization and smallest leakage. The opening force of the Z-groove seal reaches its maximum value when the radial deflection coefficient is 0.500-0.625 and the circumferential deflection coefficient is 0.375-0.500, but it decreases nearly linearly with the increase of helix angle. The average vapor volume fraction of lubricating film reaches its minimum value when the radial deflection coefficient is about 0.625, the circumferential deflection coefficient is about 0.375 and the helix angle is about 20°. The minimum value of leakage is obtained when the radial deflection coefficient is about 0.625 and the circumferential deflection coefficient is 0.500, but it increases nearly linearly with the increase of helix angle.
2023 Vol. 41 (11): 1148-1155 [Abstract] ( 9 ) [HTML 1KB] [ PDF 3045KB] ( 135 )
1156 Analysis of water hammer characteristics in pressurized pipeline based on CFD
WANG Yong,*,XIONG Wei,DING Zhiyao,PI Qin,YUAN Xiao,LIU Houlin,LI Ming
To further reveal the hydraulic transition process of pipeline system under different flow rates conditions and reduce the harm of water hammer, the simplified straight pipeline system was taken as the research object, and the valve closing water hammer was studied by numerical simulation. Three-dimensional CFD numerical calculation of valve closing water hammer with continuous water column in straight pipeline system was carried out based on SST k-ω turbulence model, and the VOF multiphase flow model and Schnerr-Sauer cavitation model were used to study the water hammer phenomenon with water column separation in straight pipe system, and the transient flow characteristics of the straight pipe system under different steady-state initial velocities and valve closing schemes were obtained. The results show that when the steady-state initial velocity is small, water column separation will not occur, but water column separation will exist when the steady-state initial velocity is large, the propagation of water hammer wave can be approximately divided into four stages, the water hammer pressure will gradually decay due to dissipation, and greater water hammer pressure will be caused when the water column is closed. The steady-state initial velocity and valve closing scheme have a great influence on the water hammer pressure, the water hammer pressure increases with the increase of steady-state initial velocity, and the maximum water hammer pressure is approximately linear with the steady-state initial velocity. When the valve is closed instantaneously, the water hammer pressure is the maximum. When the valve is closed slowly first and then fast, the water hammer pressure is the minimum. Thus, the study has a certain guiding effect on water hammer protection of pressurized pipeline.
2023 Vol. 41 (11): 1156-1162 [Abstract] ( 7 ) [HTML 1KB] [ PDF 2952KB] ( 154 )
1163 Effect of aeration on flocculation and sedimentation of fine sediment in water fertilizer mixture
LYU Chang,DONG Aihong,ZHANG Erxin,ZHAO Xue,WANG Yanbang,NIU Wenquan,*
In order to explore the influence of aeration on the sediment sedimentation capacity in the water and fertilizer integrated drip irrigation pipe network, muddy water with a combination of sediment of six particle sizes and three types of fertilizers(potassium sulfate fertilizer, compound fertilizer and urea, mass fraction of 1.0%)was configured. The turbidity of muddy water, the median settling velocity of sediment and the median particle size of settled sediment before and after aeration were measured under three kinds of flow shear strengths(0, 1.38 and 4.67 s-1). The results show that aeration acce-lerates the flocculation and sedimentation of fine sediment in water fertilizer mixture. After aeration of urea water fertilizer mixture, the increase of median settling velocity of sediment is the largest, followed by potassium sulfate fertilizer, and the compound fertilizer is the smallest, which increase by 89.27%, 52.74% and 45.63% respectively compared with non-aeration treatment. The effect of aeration on flocculation and sedimentation of sediment increases with the decrease of particle size of sediment. Aeration significantly promotes the flocculation of sediment with median particle size less than 31 μm(P<0.05), and the particle size of settled sediment increases by 3.22%-21.99% compared with that of non-aerated treatment. Aeration significantly promotes the sedimentation of sediment with median particle size less than 53 μm(P<0.05), and median settling velocity is 23.96%-89.27% higher than that of non-aerated treatment. The greater the flow shear strength, the smaller the effect of aeration on sediment settlement. When the flow shear strength is less than 4.67 s-1, the median settling velocity of aerated treatment is significantly higher than that of non-aerated treatment by 9.38%-89.27%(P<0.05). The interaction of sediment particle size, fertilizer type, flow shear strength and aeration treatment significantly affects the flocculation and sedimentation of muddy cement sand. It is suggested that the irrigation pipe network should be washed regularly during drip irrigation of water fertilizer gas mixture to reduce the sedimentation sediment in the pipe network.
2023 Vol. 41 (11): 1163-1170 [Abstract] ( 6 ) [HTML 1KB] [ PDF 1317KB] ( 143 )
1171 Influence of water quality on infiltration process of artificial compound soil
ZHANG Ruiqing,HE Zhenjia,SUN Zenghui,*
In order to deeply analyze the impact of water quality on the infiltration characteristics of artificial compound soil, indoor soil column simulation experiments were conducted to analyze the impact of water quality on the infiltration characteristics of artificially mixed soil under seven different volume ratios(1∶0, 5∶1, 2∶1, 1∶1, 1∶2, 1∶5, and 0∶1)of a feldspathic sandstone and aeolian sandy soil under two different chemical properties of natural accumulated water and groundwater. The results show that when the artificial composite soil texture is compounded of silty loam, sandy loam, and loamy sand(ratios of sandstone to sandy soil 1∶0, 5∶1, 2∶1, 1∶1, and 1∶2), the infiltration time of the natural water accumulation is significantly longer than the infiltration time of the groundwater. When the artificial composite soil texture is loamy san and sand soil with a ratio of 1∶5 and 0∶1 for the combination of sandstone and sand, there is no significant difference in the infiltration time of the natural water accumulation and the subsurface irrigation water. Using the same water quality, the infiltration time in different ratios of compounded soils decreases from 1∶0, 5∶1, 2∶1, 1∶1, 1∶2, 1∶5, to 0∶1. Under the same sandstone and sandy soil ratio, the cumulative infiltration amount under natural water accumulation treatment is greater than that using groundwater irrigation water treatment. Moreover, the difference in cumulative infiltration is greatest when the ratio of sandstone to sandy soil is 2∶1. The fitting relationship between the cumulative infiltration amount and elapsed time is consistent with the Logarithmic infiltration model. The variation law of the advancing in wetting front migration distance is consistent with the variation laws of the cumulative infiltration. The results show that water quality significantly affects the infiltration performance of artificial compound soil, and the degree of impact is closely related to the type of artificial compound soil texture.
2023 Vol. 41 (11): 1171-1178 [Abstract] ( 2 ) [HTML 1KB] [ PDF 2534KB] ( 127 )
1179 Effects of different films mulching on salt and heat changes and yield of spring maize farmland
LIANG Xiaoyang,SHEN Xin,WANG Chuanjuan*,ZHANG Yanqun,WANG Dongbo,WANG Jiandong,GUO Qinghua
Clarifying the field application effects of different types of film mulching technologies is of great scientific significance for promoting green and efficient mulching technologies. Taking spring maize under surface irrigation in Hetao Irrigation District as the research object, the effects of four mulch types, including non-mulching(CK), conventional polythene mulching(PE), high-strength recyclable mulching(HS), and biodegradable mulching(BP), on soil temperature, salt transport, maize growth, yield and water use efficiency(WUE)during the entire growth period of spring maize were quantitatively analyzed. The results of this study show that the effective accumulated temperature of the main root zone(0-40 cm)of PE, HS and BP increases by 64.1, 61.4, 52.5 ℃, respectively, compared with CK at 60 days after sowing. Mulching inhibits the occurrence of salt migration upward and surface aggregation, and the occurrence of surface accumulation. In the 10 cm soil layer, the mass fractions of soil salt decrease by 45.0%(HS), 37.0%(BP)and 17.9%(PE), respectively, compared with CK. Film mulching measures can accelerate the process of maize growth and development and improve the quality of aboveground dry matter in the early growth stage of spring maize. Compared with CK, the yield and WUE of PE, HS, BP treaments are significantly increased by 12.8%, 10.3%, 14.3% and 12.8%, 4.8%, 17.0%(P<0.05), respectively. The yield of spring maize is significantly positively correlated with the effective accumulated temperature of 10 cm soil layer during the entire growth period(R2=0.758 18)and the aboveground dry matter accumulation at harvest(R2=0.510 86). Both high-strength plastic mulch film and biodegradable mulch film have positive impacts on increasing temperature, salt pressure, as well as crop yield, which may be promoted and applied in practical production in Hetao Irrigation District.
2023 Vol. 41 (11): 1179-1188 [Abstract] ( 6 ) [HTML 1KB] [ PDF 2618KB] ( 131 )
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