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Journal of Drainage and Irrigation Machinery Engin
 
2019 Vol.37 Issue.10
Published 2019-10-25

article
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2019 Vol. 37 (10): 1- [Abstract] ( 30 ) [HTML 1KB] [ PDF 954KB] ( 109 )
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2019 Vol. 37 (10): 2- [Abstract] ( 288 ) [HTML 1KB] [ PDF 244KB] ( 81 )
829 Influence of steam generator outlet pipe parameters on inlet flow field of nuclear reactor coolant pump
LIU Cong,WANG Yuehui,MA Tengyue,WANG Pengfei,XU Zhongbin*,RUAN Xiaodong
According to the scale model experiment, it is found that the outlet pipe of the steam gene-rator(SG)has an obvious non-uniform inflow. In order to study the influence of the SG outlet pipe parameters on the inlet flow field of nuclear reactor coolant pump(RCP), a unified model of the SG lo-wer head and the RCP was established, and the three-dimensional flow field was simulated by CFD method. The results show that the outlet pipe length of the SG has a great influence on the inlet flow field of the RCP, and the influence is particularly obvious when the inlet pipe is shorter. With the increase of the pipe length of the SG, the influence gradually decreases, and the inlet flow field of the RCP tends to be stable. The location of the outlet pipe of the SG has little influence on the flow field turbulence of the RCP inlet, and the development trend of the flow field in the different positions of the tube is similar, but it will have a great impact on the position of the high-speed and the low-speed regions of the flow field. The flow field in the outlet pipe of the SG is extremely disordered, and there is a large recirculation zone at the beginning. With the development of the flow field, the reflux phenomenon disappears around 350 mm from the SG outlet, and then the flow field becomes stable gradually, but the eccentricity of the flow field will not disappear.
2019 Vol. 37 (10): 829-833 [Abstract] ( 309 ) [HTML 1KB] [ PDF 7294KB] ( 92 )
834 Effect of balance holes and back blades on axial thrust of centrifugal pump
LIU Zailun,, LU Weiqiang*, ZHAO Weiguo,, CHEN Taoli
In order to investigate the effect of balance holes and back blades on axial thrust of the low specific speed centrifugal pumps, the IS80-50-315 centrifugal pump was chosen as the research object. Four different projects were tested and numerically analyzed, which included the balance hole, the back blade and both of them and neither of them. The results show that the influence of the back blades on the hydraulic performance of the centrifugal pump is greater than that of the balance hole, and it plays a leading role in energy loss of centrifugal pump. Under the rated operating mode, the fluid pressure in front pump chamber radially changes with ladder shape, the fluid pressure in the rear pump chamber approximately linearly increases, and the fluid pressure in balance cavity almost shows linear distribution with the change of flow. In the same test pump, the balance hole has greater influence on the liquid pressure in the front pump cavity and the balance cavity. The back vane has a better effect on the pressure drop of fluid in the back-pump cavity. At the same time, the torque is obviously increased when back blades are added on the runner, but the torque of the runner is slightly increased with only balance holes. The balance hole has better balance effect on axial force than back blades under the full flow conditions, and the ability of balancing axial force is the worst when both of them exist.〓
2019 Vol. 37 (10): 834-840 [Abstract] ( 320 ) [HTML 1KB] [ PDF 4160KB] ( 154 )
841 Three-dimensional transient characteristics and unstable flow of annular linear induction pump
ZHAO Ruijie*,MIAO Heng, ZHANG Desheng,HUANG Jun,GAO Xiongfa
A three-dimensional transient magnetic-fluid coupling model of ALIP is established by using COMSOL software based on finite element method. The model is verified by comparing the simulation results of integral outer stator ALIP model with the previous experimental data. On this basis, the ALIP model of the separated external stator is established, and the evolution process of Kelvin-Helmholtz-like instability is observed. The reverse flow and vortices on the circumferential plane(φ-z)always appear in the channel region corresponding to the air between the two stators, a wave-like swing of the flow is presented at the rear of the unstable flow region. The unsteady flow on the meridional plane(r-z)first appears near the outer duct wall. Finally, the formation mechanism of Kelvin-Helmholtz instability is analyzed from the perspective of force balance. The separated stator structure makes the magnetic field and Lorentz force non-uniformly distributed in the azimuthal and radial directions, and then affects the distribution of flow field, which eventually leads to unstable flow.
2019 Vol. 37 (10): 841-847 [Abstract] ( 302 ) [HTML 1KB] [ PDF 9355KB] ( 108 )
848 Influence of diffuser radial position of guide vane on submersible well pump performance
CHENG Xiaorui,, ZHANG Xuelian*, LYU Boru, LIU He
In order to study the influence of radial position of guide vane on the performance of submersible well pump, nine configurations of guide vane were designed by changing the radial position of spatial guide vane under a certain condition of other parameters, aiming at the 250QJ125 of submersible well pump. Based on the Reynolds-averaged N-S equation, the RNG k-ε model and the SIMPLE algorithm, the three-dimensional numerical calculation of the full runner was carried out for the internal flow of the guide vane of submersible well pump in different radial positions. Through analysing the calculation results, the performance parameters of the submersible pump are obtained under different guide vane programs. At the same time, the loss of guide vane and the variation rule of cross section area as well as the turbulent kinetic energy and static pressure distribution inside the guide vane are compared. The results show that the radial position of the guide vane has a significant influence on the performance of the submersible well pump. When the radial distance of the guide vane is increased to an appropriate position, the internal loss of the guide vane is small, and the energy conversion capabi-lity is excellent. In addition, the fluctuation of the turbulent kinetic energy inside the guide vane is weakened, and the flow loss is greatly reduced, so as to improve the efficiency of pump. However, the variation rule on the cross section area of guide vanes is obviously different, and the degree of turbulent kinetic energy fluctuation aggravates when the radial distance is exaggerated. Therefore, the flow loss of guide vanes increases and the performance of pump drops.
2019 Vol. 37 (10): 848-854 [Abstract] ( 297 ) [HTML 1KB] [ PDF 4165KB] ( 111 )
855 Influence of long and short guide vanes on hydraulic performance of water-jet pump
LI Qiang, XIA Shengsheng*, YAN Hao
Different guide vane structures will affect the flow inside the pump, and then affect the transformation of the pressure energy and kinetic energy, and change the velocity distribution of the pump outlet. In order to study the influence of long and short guide vanes on the water-jet pump, on the basis of conventional design, we designed eight schemes of guide vane with different vertical heights in the method of computational fluid dynamics for numerical calculation, obtained the perfor-mance curve of water-jet pumps which had different long and short guide vanes, and finally analyzed the influence of different guide vanes on hydraulic performance and internal flow.The results show that all of schemes reducing the height of blade can improve the head and efficiency. In the schemes redu-cing the height on the shroud, the guide vanes that the height of the blade is equal to the height diffe-rence between hub and shroud in impeller have the highest head and efficiency. In all schemes decreasing the blade height, with the increase of the height difference, the velocity increases gradually and the distribution of turbulence kinetic energy becomes more reasonable in the guide vane outlet. The schemes reducing the height on the hub have more reasonable distribution of velocity and turbulence kinetic energy according to schemes reducing the height on the shroud.The guide vanes of long and short blades can be used to stagger the position of the diffusion flow generated by adjacent blades, which can reduce the effect of the velocity circulation and make the flow of the outlet position more stable.
2019 Vol. 37 (10): 855-862 [Abstract] ( 51 ) [HTML 1KB] [ PDF 7262KB] ( 102 )
863 Temperature control of RCC gravity dam in tropical high-temperature area
ZHANG Xiaofei, WANG Xiaoping*, ZHANG Xin, LIU Qian, HUANG Yu, LI Shouyi
In order to study the effect of temperature control measures when pouring concrete dams at high temperature and find suitable temperature control measures for high-temperature construction environments, combined with the actual project, using finite element method, we simulate the temperature stress during the construction and operation phases of a RCC gravity dam and analyze the temperature and stress field of the dam at different cooling water temperatures and pouring temperature. Results show that the dam temperature stress is greatly influenced by pouring temperature and cooling water temperature: in basic restraint areas, while the pouring temperature reduced from 25℃ to 23℃ and the cooling water temperature reduced from 20℃ to 15℃, the highest temperature in dam body reduced from 36.9℃ to 34.6℃ and the maximum temperature stress reduced from 1.64MPa to 1.40MPa. The result meets the requirement of temperature control and crack prevention of the dam. It can be seen that when concrete dams are built in high-temperature areas, the temperature and temperature stress of the dam can be effectively controlled at relatively high pouring temperature and cooling water temperature. The present result is of important value in simplifying temperature control measures, shortening the construction period and reducing the investment.
2019 Vol. 37 (10): 863-869 [Abstract] ( 308 ) [HTML 1KB] [ PDF 5526KB] ( 123 )
870 Application of dam deformation prediction model
JIANG Xian-Qun, CHEN Wu-Fen, SHAO Jin-Long, HUANG Zheng-Wu
In order to reflect the internal law of dam deformation data more accurately, the stability and safety of the dam are evaluated and effective measures are taken in time. The Lixi dam in Guangzhou was selected as the research object. 753 sets of data of 4 # hydrostatic level from September 2015 to March 2019 were collected, 355 sets of data from September 2015 to December 2017 were selected as the training set to establish the model, and 328 sets of data from January 2018 to December 2018 were used as the model verification set to evaluate the performance of the model,From January 2019 to March 2019, 70 sets of data were used as model test sets. Stepwise regression analysis model and time series model were used to model and verify the analysis.The forecasting results of sample test set show that the mean square error of stepwise regression analysis model test set is 0.022 and the determinant coefficient is 0.951; the mean square error of time series model test set is 0.007 and the determinant coefficient is 0.985. The results show that the time series model is better than the stepwise regression model in fitting, forecasting and error analysis.
2019 Vol. 37 (10): 870-874 [Abstract] ( 315 ) [HTML 1KB] [ PDF 2146KB] ( 120 )
875 Effect of salt water on friction properties and microstructure analysis of UHMWPE
MA Xihe, WANG Zhenhua*, HE Qiang, LI Wenhao, ZHANG Yong
In order to study the friction performance and the micro dynamics of ultra-high molecular weight polyethylene(UHMWPE)pipe in the salt water transport process, we applied the CFT-I material surface performance comprehensive test instrument to the rotating friction on UHMWPE material specimen under three different conditions of dry friction, water lubrication and salt water lubrication. Then we analyzed the regularity of the influence on the properties of UHMWPE friction and wear particles in the process of the salt water lubrication and the microscopic movement form by the scanning electron microscope and surface contourgraph under variable factors such as the speed of 500 r/min, load of 50 N, lasting for 25 min; the speed of 500 r/min, lasting for 10 min and the load of 30 N, 50 N, 70 N, 90 N and 110 N; load of 50 N, lasting for 10 min, and the speed of 300 r/min, 500 r/min, 700 r/min, 900 r/min and 1100 r/min. Results showed that UHMWPE wear mechanisms are mainly abrasive wear under the salt water lubrication, the friction coefficient and wear quantity in salty lubrication are minimal compared with those under the dry friction and water lubrication, and the friction coefficient increased first and then decreased with the increase of load and speed, presenting downtrend with the time extension. Salt water lubricant in the friction process can form strong antifriction performance of lubricant film as well as salt water crystallization particles which play the ball role, which can reduce the UHMWPE wear in salt water delivery, this paper made a theoretical basis for the application of UHMWPE in salt water environment.
2019 Vol. 37 (10): 875-881 [Abstract] ( 331 ) [HTML 1KB] [ PDF 7601KB] ( 158 )
882 Gas-liquid-solid flow characteristics and performance of dynamic pressure mechanical seal
CHEN Huilong, SUN Dongdong, WU Yuanzheng, CHEN Miaomiao, ZHANG Peilin, ZHAO Binjuan
In order to explore the gas-liquid-solid flow characteristics and sealing performance on micro-gap of dynamic pressure mechanical seal, a gas-liquid-solid multiphase flow model of gap lubrication film was established to simulate the gap flow to analyze the effects of channel parameters and operating parameters on the flow characteristics and sealing performance. The results show that the increase of groove width ratio, helix angle and speed, and the decrease of groove depth will increase the cavitation area of the lubrication film. With the increase of groove width ratio, groove ratio and groove depth, the opening force of the lubricating film increases first and then decreases. The optimum groove type parameters are groove width ratio 0.3~0.6, groove diameter ratio 0.7~0.8, groove depth. 6~10μm(high speed and high depth), Smaller helix angle for greater opening force. In the studied parameters, the seal is mainly negative leakage, and the increase of the rotational speed, the ratio of the groove diameter and the decrease of the helix angle will increase the absolute value of the leakage, and the increase of the groove depths and the groove width ratio will increase the absolute value of the lea-kage first and then decrease. In general, the solid particles are mainly concentrated in the tank area and the inner side of the dam area. The decrease of the ratio of the groove diameter and the increase of the helix angle, cause the solid particles to aggregate in the trough area, which easily cause the the spiral groove to be blocked and then failed.
2019 Vol. 37 (10): 882-888 [Abstract] ( 307 ) [HTML 1KB] [ PDF 4775KB] ( 124 )
889 Turbulent Taylor-Couette flow and its heat transfer characteristic based on PANS model
LIU Dong*, DING Shicheng, ZHOU Wenjie, SUN Siliang, KIM Hyoung Bum
The flow field in the annulus of two coaxial cylinders is studied. The turbulent flow simulation method based on Partially-averaged Navier-Stokes method(PANS)is established by comparing various turbulent model results with the experimental results. The flow field distribution and heat transfer characteristics of slit model are analyzed in turbulent Taylor-Couette flow regime. The influences of Reynolds number and temperature gradient between inner and outer cylinders on the flow distribution and heat transfer characteristics were investigated. In addition, the formation of smaller vortices and the distributions of heat flux, velocity and wall shear stress in the slit region are analyzed. The results show that the axial motion of turbulent Taylor-Couette vortices appears aperiodical when the flow regime turn to turbulent Taylor-Couette flow. The axial sizes of Taylor vortices increase with the increase of Rey-nolds number and temperature gradient of inner and outer walls. The change of radial velocity and inner wall heat flux along the axial direction shows that the out jet caused by radial velocity has a direct influence on heat exchange between inner and outer walls.When the fluid in the annulus flow goes through the groove area, it impcts on the groove wall surface and forms vortices under the influence of inertia force, viscous force and wall shear force.The velocity in the groove area is consistent with the change of wall shear force, but the heat flux is opposite.
2019 Vol. 37 (10): 889-894 [Abstract] ( 318 ) [HTML 1KB] [ PDF 5571KB] ( 708 )
895 Experimental study on landscape of CFRP cutting by abrasive water jet
RUAN Xiaofeng, ZOU Jialin, CHEN Zhengwen,XUE Shengxiong, LONG Xinping*
To investigate the influence of operation parameters of abrasive water jet on surface roughness of carbon fiber reinforced plastic(CFRP), experimental studies have been conducted. The three-dimensional landscape of cutting front was reconstructed according to the measured data by μscan laser confocal microscopy. Fourier spectral analysis was also adopted to study surface structure in detail. It is found that the morphology of cutting front is similar to that of other materials. In the smooth cutting zone, the fluctuation of amplitudes of surface profile was gentler, compared with that in the rough cutting zone. The lower part of the rough cutting zone was characterized by the periodical appearance of peaks and valleys. The roughness of surface increased with the increase of depth. While in the smooth cutting zone and part of rough cutting zone, roughness increased with the increase of traverse speed. As for the thickness of samples, in the smooth cutting zone, the roughness increased with the increase of depth. The dominant harmonic component in the surface profile was concentrated in a narrow range from 0 to 10 Hz, and the relatively higher density of frequency from 10 to 50 Hz was shown in the rough cutting zone, which was caused by the interaction between perpendicular abrasive water jet and reflect jet.
2019 Vol. 37 (10): 895-901 [Abstract] ( 301 ) [HTML 1KB] [ PDF 29270KB] ( 106 )
902 Effects of drip irrigation water temperature on soil infiltration and soil temperature
ZHU Hongyan,LIU Lihua,FEI Liangjun
To understand the effect of drip irrigation water temperature on soil infiltration characteristics and soil temperature, a set of constant temperature device was developed to control water temperature fluctuanting range being within ± 0.5 ℃. At 5 ℃, 20 ℃ and 35 ℃, drip irrigation infiltration experiments were carried out respectively in the laboratory, then soil water infiltration and soil temperature were analyzed at different water temperatures. The results show that in the same time period, with the increase of drip irrigation water temperature, the horizontal and vertical wetted front migration distances increase, and the vertical wetted front migration rate increases. The model of horizontal(vertical)migration distance of wetted front, the infiltration time and water temperature is established under the condition of drip irrigation water infiltration at different water temperatures, with their correlation coefficients R2 all greater than 0.99. The average soil water content of the wetted soil body is not related to the infiltration time, but it decreases with the increase of the infiltration water temperature. The diffusion rate of soil moisture increases with the increase of water temperature. The saturated hydraulic conductivity is an exponential function of water temperature, it increases with the increase of water temperature, but the increase is smaller and smaller. The higher the temperature is, the lower the ability of soil to absorb water is. The different irrigation water temperature changed the temperature distribution in the soil. The Nariation of soil temperature caused by water temperature gradually decreased with the increase of the distance from the dropper. The conclusion could provide theoretical reference for drip irrigation technology in field and greenhouse.
2019 Vol. 37 (10): 902-908 [Abstract] ( 323 ) [HTML 1KB] [ PDF 3539KB] ( 128 )
909 Experimental research on mechanical properties and constitutive model of Pisha-sandstone remolded soil
LI Xiaoli, LI Mingyu, XIE Weidong
In order to study the the effects of water content and confining pressure on the mechanical properties of remolded arsenic sandstone soil, triaxial shear tests were carried out with TSZ-6A automatic static triaxial apparatus. The results show that with the increase of confining pressure, the shear strength of soil gradually increases, and the larger the moisture content, the smaller the shear strength of soil. And both of them show an approximate linear trend. Based on Duncan-Chang model, the constitutive model of remolded arsenic sandstone soil is established with water content and confining pressure as influencing factors. The model is applied to predict the stress-strain relationship of remol-ded soft sandstone soil with different water contents and confining pressures. The predicted results are close to the measured results, showing that the predictive model with water content and confining pressure as parameters performs better in reflecting the constitutive relationship of remolded soft sandstone soil, which will provide a theoretical basis for the application of Pisha-sandstone remolded soil in the engineering construction of this area.
2019 Vol. 37 (10): 909-914 [Abstract] ( 307 ) [HTML 1KB] [ PDF 2524KB] ( 98 )
915 Safety evaluation index system and model for small underground drinking water sources
HOU Xinyue *, ZHAO Wei, LANG Jingbo, ZHAO Cui
To scientifically evaluate the suitability of the selection of small underground drinking water sources, twenty-six indicators were selected from the point of view of the water quality safety, water quantity safety, and economic security. Based on the analytic hierarchy process (AHP), a mathematical model of evaluation indicator system was established. The weight of factors was defined by the method of document data and expert questionnaire, and these weights were synthesized under single criterion. These factors were classified and quantified according to the laws, technical standards and statistical data. By the calculation of factor scores and weights, the evaluation results can be got. The evaluation system and model were suitable for quantitative analysis and scientific decision-making on site selection of decentralized underground drinking water sources in northern rural areas.
2019 Vol. 37 (10): 915-920 [Abstract] ( 304 ) [HTML 1KB] [ PDF 1517KB] ( 131 )
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