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Journal of Drainage and Irrigation Machinery Engin
 
2021 Vol.39 Issue.8
Published 2021-08-25
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2021 Vol. 39 (8): 1- [Abstract] ( 21 ) [HTML 1KB] [ PDF 1756KB] ( 358 )
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2021 Vol. 39 (8): 2- [Abstract] ( 26 ) [HTML 1KB] [ PDF 1311KB] ( 387 )
757 Influence of blade wrap angle on performance in T-mode multistage hydraulic turbine
LI Yanpin,ZHANG Lihong*,ZHANG Zichao,CHEN Dexin
In order to study the influence of blade wrap angle on the performance of hydraulic turbine, taking a two-stage turbine as the research object, the runner blade wrap angles were designed as 20°, 30°, 40° and 50°, respectively, and the Fluent software was used for numerical calculation. The results show that the blade wrap angle has a significant effect on the turbine hydraulic performance. With the increase of the wrap angle, the turbine head increases gradually, and the efficiency first increases and then decreases. Under the design condition, when the wrap angle is 30°, the efficiency reaches 80.24%. Due to the negative circulation of the primary runner, the import circulation of the secondary runner is lower than that of the primary runner, resulting in the lower efficiency of the secondary runner than that of the primary runner. Through the analysis of the pressure pulsation characteristics, it is shown that the pressure pulsation intensity in the runner is higher than that in other flow passage parts, and the pressure fluctuation in the secondary runner is the strongest. The appropriate value of the wrap angle can reduce the pressure fluctuation amplitude of each flow passage component. For the turbine with 30° wrap angle, the numerical simulation results are consistent with the test results, which verifies the accuracy of the numerical simulation results.
2021 Vol. 39 (8): 757-763 [Abstract] ( 54 ) [HTML 1KB] [ PDF 12001KB] ( 452 )
764 Influence of mixed sand on wear of centrifugal pump with semi-open impeller
WANG Yong*,LI Gangxiang,YUAN Xiao,ZHANG Guoxiang,Wu Pu,LIU Houlin
In order to study the influence of sand-bearing water with mixed particle sizes on the wear characteristics of centrifugal pump components, using RNG k-ε turbulence model and SIMPLEC algorithm, based on particle discrete phase model(DPM)and semi-empirical McLaury erosion model, the Rosin-Rammler distribution fitting method was used for sand injection, and wear characteristics of solid-liquid two-phase flow in a semi-open centrifugal pump were numerically analyzed. The results show that the large particles in the impeller passage tend to move towards the suction surface of the blade. When the particle size of the mixed sand is small, the movement of the sand particles in the volute is more uniform. The larger the particle size is, the closer the movement of the sand particles is to the volute wall. The average residence time distribution of sand particles with different particle sizes is similar on the pressure surface, suction surface and back shroud. The larger the particle size is, the smaller the average residence time is. The distribution of the mean residence time of the sand particles with particle size not more than 700 μm on the volute wall was similar to that of the sand particles on the impeller′s flow wall. The mean residence time of the sand particles with particle size greater than 700 μm increased with the increase of the particle size. With the increase of the large particle size of the sand component, the wear strength of the pressure surface of the blade decreases gradually, while that of the suction surface of the blade, the back shroud and the volute increases gradually.
2021 Vol. 39 (8): 764-769 [Abstract] ( 36 ) [HTML 1KB] [ PDF 20815KB] ( 358 )
770 Research progress of reactor coolant pump pressure fluctuation and its improvement methods
YE Daoxing*,LIU Anlin,LUO Yimin,YU Bo,LAI Xide
Pressure pulsation is an important factor that causes unstable phenomena such as vibration and noise in the reactor coolant pump. The strong pulsation may cause a nuclear accident. With the rapid development of the nuclear power industry, in order to ensure the safe and stable operation of the nuclear island, the research on the pressure pulsation of the reactor coolant pump has become extremely important to the safety of the nuclear island. Reviewing the relevant research results of diffe-rent researchers in recent years on the pressure pulsation of the reactor coolant pump, and discussing the research related to the pressure pulsation through a literature survey, it is found that the main factors of the pressure pulsation are the impact of the reactor coolant pump inflow, the secondary return flow, and the static and dynamic interference. As for flow disturbances caused by them, generally, theoretical analysis, numerical simulation and model tests can be used to study the pressure pulsation of the reactor coolant pump. Finally, the current research status of pressure pulsation in each flow channel of the reactor coolant pump in the case of large, medium, and small flow rates, rotor seizure accident and loss of coolant accident in the past ten years were summerized. The method to improve the pressure pulsation of the internal flow passage of the nuclear main pump by optimizing the structure of the impeller, guide vane and volute were also concluded.

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2021 Vol. 39 (8): 770-776 [Abstract] ( 57 ) [HTML 1KB] [ PDF 4059KB] ( 429 )
777 Prediction of pump′s complete characteristic curves and its influence on further numerical analysis
HUANG Ya,ZHOU Jianxu*
To evaluate the hydraulic transition characteristics of the pumping system, and conduct reasonable and effective water hammer protection, a newton interpolation algorithm-based prediction me-thod for the complete characteristic curve of the pump was proposed based on the Suter curves of the pump characteristics, and a numerical transformation method that uses the basic characteristic curve of the pump to correct the complete characteristic curve of the pump was further given. The comparison analysis with the commonly used methods for predicting and fitting the complete characteristic curve of water pumps was conducted, and the application analysis in the calculation of the transition process of the pumping system was introduced. The results show that the newton interpolation algorithm-based prediction method for pump′s complete characteristic curves is convenient for practical application, and this method flexibly adapt to the supplement of basic fitting data. Moreover, the predicted Suter curves of the pump is reasonable and reliable. These Suter curves can improve the accuracy of working para-meters as the pump system is in steady-state operation condition, and accurately provide the flow cha-racteristics and energy characteristics of the pump under complete conditions to meet the accuracy requirements for hydraulic tran-sient analysis.
2021 Vol. 39 (8): 777-783 [Abstract] ( 32 ) [HTML 1KB] [ PDF 1822KB] ( 954 )
784 Experiment of thrust disk as auxiliary impeller in a high-speed rescue pump
BAI Yuxing,FENG Zizheng,WU Jinguo,KONG Fanyu,CHEN Ruwen*
In order to obtain the hydraulic characteristics of thrust disk as auxiliary impeller in the mine high-speed rescue pump, a multi-function thrust disk experimental platform was built. The hydraulic and anti-cavitation performance of the thrust disk as auxiliary impeller at different speeds and temperatures were studied through the experimental method. The results show that different from the traditional centrifugal pump, the law of speed variation is not applicable to the head generated by the thrust disk as auxiliary impeller. The higher the speed is, the smaller the head coefficient is. The flow range of the thrust disk is related to its own structural characteristics. Under six different speeds, the head decreases as the flow velocity increases, and the maximum and minimum heads are 19.64 m and 2.62 m, respectively; the efficiency increases first and then decreases, the maximum unit efficiency is 6.5%; the power decreases slowly. With the increase of rotating speed, the flow range of the thrust disk as auxiliary impeller increases slightly, and the head and power values increase at the same flow point. In terms of anti-cavitation performance, the influence of temperature on the cavitation perfor-mance is different at different speeds; at different flows, while the anti-cavitation performance of the thrust disk as auxiliary impeller at small flow condition is better than that at large flow condition.
2021 Vol. 39 (8): 784-789 [Abstract] ( 32 ) [HTML 1KB] [ PDF 3233KB] ( 510 )
790 Rotor dynamic characteristics of bearing-rotor system of turbo charged pump
PAN Huishan,JIANG Xiaoping*,LANG Tao,ZHOU Chenjia,CAO Ling,ZHANG Desheng,HU Jingning
In response to the problem of high-speed operation stability of turbo charged pump, the water-lubricated bearing-rotor system was taken as the research object, the characteristic coefficients of the bearings were obtained through bearing modeling and Matlab programming calculation, and the physical model and finite element model of the bearing-rotor system were established; the first 4th order critical speed and mode shapes of the rotor system were calculated by Samcef Rotor; the internal flow field of turbo charger pump was calculated by CFX14.5, and the radial force of the turbine impeller and the booster pump impeller under different flow conditions were obtained, the transient response analysis of bearing-rotor system was conducted by using the unbalanced mass and radial force as external excitation. The results show that the critical speed of the first-stage bending of the rotor system is 36 298 r/min, which is much larger than the design speed of 16 000 r/min, indicating that the rotor of the turbo charged pump is a rigid rotor. Compared with the pump, the transient response of the turbine is more obvious and the amplitude is larger by only using unbalanced mass as an external incentive. When loading fluid excitation force at the same time, the vibration is significantly strengthened. The amplitude of the vibration displacement is different under different flow conditions, and the rotor system is most stable under design flow conditions.

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2021 Vol. 39 (8): 790-796 [Abstract] ( 42 ) [HTML 1KB] [ PDF 2516KB] ( 540 )
797 Numerical simulation research on inlet flow pattern of small sluice station side pumping station
LUO Can*,LEI Shuaihao,YUAN Yao,CHENG Li,DU Kang
Based on the RANS equation and the RNG k-ε turbulence model, the numerical simulation of the inlet flow pattern of a small sluice station lateral water pumping station was carried out. And three different rectifying measures are proposed to improve the bad flow pattern in the sump of the original scheme. Then the flow pattern of each sump is observed and the axial velocity distribution uniformity, velocity weighted average angle and axial average flow velocity before the pump are analyzed. The results show that there are large recirculation zones in 1#—3# sumps under the original scheme, which extend from the inlet of the sump to the front of the inlet pipe, and the flow pattern is extremely harmful. By arranging airfoil deflectors or J-shaped diversion piers, the recirculation zone of 1# sump is reduced dramatically, and the recirculation zones of 2# and 3# sumps disappear. Moreover, the combined measure of J-shaped diversion piers and airfoil deflectors is the best rectifying measure to improve the flow pattern, the large recirculation zones in the sump disappear, the axial velocity distribution uniformity of the selected section increases by 12.2%, and the flow patterns are uniform and symmetric. The research result is helpful for the future rectification of the flow in the sump for other similar pump stations.
2021 Vol. 39 (8): 797-803 [Abstract] ( 48 ) [HTML 1KB] [ PDF 6296KB] ( 439 )
804 Influence of stone powder on working and mechanical properties of high-strength manufactured sand concrete
WANG Jianguo,ZHOU Hailong*,GE Chenglong,CHEN Yan
In order to explore the influence of fly ash, silica fume and different contents of stone powder on the working and mechanical properties of high-strength manufactured sand concrete, C70 manufactured sand concrete with different stone powder contents(3%, 5%, 7%, 9%, 11%)was prepared, with the help of nuclear magnetic resonance(NMR), differential thermal-thermogravimetry(TG)synchronous test and field emission scanning electron microscope test(SEM)to study its mechanical properties and microscopic evolution. The research results show that the high-strength manufactured sand concrete that meets the mechanical property requirements can be prepared by using stone powder and other qualities instead of manufactured sand. Under the condition that the water-binder ratio remains unchanged, the mechanical property of the concrete with a stone powder content of 5% to 7% is the best. The good micro-aggregate filling effect of stone powder and the formation of basic calcium carbonate make the hydration products C3S and CaCO3 micro-interface structure more compact, and Ca(OH)2 generates a large number of crystals on the surface of CaCO3, resulting in Ca(OH)2 crystal grains refinement, thereby improving the interfacial bonding effect, so that the interface transition zone is significantly improved. The research results can provide a theoretical reference for the use of stone powder in the design of high-strength manufactured sand concrete mix ratio.

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2021 Vol. 39 (8): 804-810 [Abstract] ( 33 ) [HTML 1KB] [ PDF 2343KB] ( 449 )
811 Experimental study on influence of stepped overflow dam slope on aeratied characteristics and negative pressure of step surface
QIU Yi,YANG Jurui*,CHEN Weixing,REN Zhongcheng
In order to explore the influence of the slope of the stepped dam face under high water head and large single wide flow rate on the aerated characteristics of the stepped face and negative pressure of the integrated joint energy dissipation method of the wide tail pier + stepped overflow dam + energy dissipation tank, taking Ahai Hydropower Station as a prototype, the transport equations were established using the speed scale and the length scale respectively, the VOF and three-dimensional RNG-turbulence models of water-gas two-phase flow were introduced, and the geometric reconstruction format was used to iteratively generate free water surfaces. Three slopes of 51.34°, 53.13° and 56.98° were studied by numerical simulation. The results show that when the slope increases, the length of the aerated cavity on the step surface increases first and then decreases. When the slope is 53.13°, the length of the aerated cavity on the step surface is the longest, which is 7.5 m. The change of the aeratied concentration of the step surface is consistent with the change of the length of the aeratied cavity, the slope increases, the aeration concentration of the step surface increases first and then decreases, and the aeration concentration after the cavity section of each scheme is less than 3% of the minimum protective aeration concentration of the step surface. At this aeration concentration, cavitation damage will occur on the step surface. The negative pressure of the step surface is bimodal, and the maximum negative pressure peak appears at the second peak. The double peak of negative pressure increases with the slope. When the slope is 56.98°, the negative pressure is the largest, and the value is -42.34 kPa.
2021 Vol. 39 (8): 811-817 [Abstract] ( 43 ) [HTML 1KB] [ PDF 2624KB] ( 474 )
818 Aerostatic bearing with porous restrictor: state-of-the-art and future perspectives
GU Yandong,B HLE Martin,SCHIMPF Artur,YUAN Shouqi*
Aerostatic bearings with porous restrictor work with externally pressurized gas, forming a gas film, achieving support and positioning. The reviewing contents are as follows. Explain the support principle of porous bearings and introduce the pressure distribution characteristics of gas film. Summarize the applications of porous materials in bearings and find that carbon graphite porous materials have relative advantages. Review the research status on the flow models, the solution methods and the expe-riments and find that Reynolds lubrication equation and Darcy equation are the main method to establish the flow models of porous bearings. Summarize the bearing optimization methods and find that intelligent optimization methods have been implemented. The future perspectives are as follows. Considering the inertial effect, establish a three-dimensional compressible flow model of porous bearings based on the Reynolds lubrication equation and the Darcy-Forchheimer equation, as well as a numerical method. Considering the inertial action of the rotor on the gas film, use CFD dynamic mesh technique for the prediction of the dynamic characteristics of porous bearings. Investigate the influence of tempe-rature, material deformation, etc. on the static and dynamic characteristics of porous bearings. Design an alignment system and adopt a high-frequency laser displacement sensor, measure the static and dynamic characteristics of porous bearings. Establish a multi-parameter and multi-objective optimization platform of porous bearings, specifically optimize the load capacity, the gas feeding power, etc.
2021 Vol. 39 (8): 818-825 [Abstract] ( 50 ) [HTML 1KB] [ PDF 4251KB] ( 918 )
826 Hydrodynamic performance of ducted turbine under complex tidal current conditions
SONG Ke*,YANG Bangcheng
In order to explore the unsteady performance of ducted turbine under complex tidal current conditions, the effects of immersion depth and the yaw angle on hydrodynamics and wake flow pattern of ducted turbine were analyzed by computational fluid dynamics(CFD)method based on the tidal current conditions in Zhaitang Island. The results show that the hydrodynamic performance of ducted turbine with different immersion depths and yaw angles show time periodic behavior consistent with the wave frequency. There is a strong transition on flow and a higher-amplitude fluctuation on hydrodyna-mic performance caused by wave-current effect with the decreasing of immersion depth. The average power coefficient and thrust coefficient of ducted turbine decrease gradually with the increasing of yaw angle under wave-current and yaw flow effect. Besides, it will also cause additional periodic fluctuations in hydrodynamic performance during one rotating period of the rotor, and the frequency of the fluctuation is determined by the rotational speed and the number of blades. The fluctuation amplitude increases with the increasing of yaw angle, and the wake structure behind ducted turbine will become quite unstable and complex.
2021 Vol. 39 (8): 826-831 [Abstract] ( 32 ) [HTML 1KB] [ PDF 2997KB] ( 466 )
832 Optimization of paddy rice irrigation schedule considering effective utilization of rainfall
CHEN Mengting,YANG Lin*,WU Guangxing,WU Zhengguang,MAO Zhi,CUI Yuanlai,LUO Yufeng
In order to use rainfall and develop water-saving irrigation better, a new method for optimization of paddy rice irrigation schedule in south China was proposed taking a case study over the Zhanghe irrigation area in Hubei province. According to the long series of historical meteorological data, the conventional flooded schedule was optimized by growth stages through changing the criterion of field water depth in each growth stage to search the optimal water depth combination which makes the best use of rainfall and reduce irrigation times, and the causes and effects of water saving were analyzed. The results indicated that after optimization, the lower limit of water depth was reduced by 10 mm and the maximum allowable water depth after rainfall was increased by 10 mm, while the upper limit of water depth was 50, 50, 55, 40 and 25 mm respectively from the early tillering stage to the milk-ripe stage. Compared with the conventional flooded irrigation schedule, the optimization irrigation schedule can increase rainfall utilization rate by 3.78% on average with the largest increase at the early tillering stage(6.41%)and decrease irrigation times by 4.60 times on average with the largest decrease at the mike-ripe stage(2.44 times)and decrease irrigation water by 5.14% on average with the largest decrease at the jointing-booting stage(7.23%).
2021 Vol. 39 (8): 832-837 [Abstract] ( 48 ) [HTML 1KB] [ PDF 1608KB] ( 519 )
838 Analysis of precipitation and temperature characteristics with time in Jingdian Irrigation District
FEI Liangjun*,LI Qiaoli,SHI Zhongxing,LI Jingsi,LIU Lihua
In order to deepen the understanding of the climate change laws in Jingdian Irrigation District in recent years, based on the precipitation and temperature data from Jingtai Meteorological Station in Gansu Province from 1983 to 2017, the variation of precipitation and temperature at different time scales were studied and the abundance of precipitation in Jingdian Irrigation District by using linear trend analysis, Mann-Kendall trend test and wavelet analysis were predicted. The results show that the precipitation show a slow increase trend, the climate tendency rate is 0.38 mm/a, the precipitation in winter irrigation showed a significant upward trend and the others showed a downward trend. There were two main periodic scales of annual precipitation change: 7 years and 11 years, respectively. The average temperature and extremely high temperature showed a significant upward trend, and the climate tendency rates were 0.056 and 0.050 ℃/a, respectively. But the trend of extremely low temperature was not obvious. The average temperature in all irrigation seasons showed a upward trend. It can be seen that the climate change in Jingdian Irrigation District showed a warm-humid trend. On irrigation season scale, winter irrigation showed an abvious warm-humid trend,but the other irrigation seasons showed a warming and drying trend.
2021 Vol. 39 (8): 838-843 [Abstract] ( 47 ) [HTML 1KB] [ PDF 2102KB] ( 440 )
844 Soil moisture characteristic curve and model analysis of purple soil with residual plastic film
JIANG Wenjun,WANG Shiji*,LI Xian,LI Da
In order to explore the influence of residual plastic film on the soil-water characteristic curve of purple soil, 5 sets of residual plastic film amount(0,90,180,360,720 kg/hm2)were set. The soil-water characteristic curve of purple soil with residual plastic film during dehumidification was measured by pressure film apparatus. RETC software and statistical analysis were used to determine the optimal fitting model. The results show that the residue plastic film reduces the water holding capacity of purple soil, water capacity of purple soil and soil water supply capacity. There are significant diffe-rences in water content and water capacity between the treatment with residual plastic film and that with pure soil. When the soil water suction is 400kpa, the soil moisture of the 720 kg/hm2 residual plastic film treatment(LS5)is 86.36% of the non-residual plastic film treatment(LS1). As the amount of residual plastic film increases, the proportion of equivalent pore volume in the low suction section(mainly draining soil water from large pores)increases, while the proportion of equivalent pore volume in the high suction section(mainly draining soil water from medium and small pores)decreases. Compared with LS1 treatment, the macropores of LS5 treatment accounted for nearly 16% increase. Model fitness analysis shows that the best fitting model of the purple soil with residual plastic film is VGM(m,1/n), and the unsaturated hydraulic conductivity mode of the best model is Mualem mode. The results can provide a reference for the influence of residual plastic film on the migration of purple soil, water and salt in the southwestern area.
2021 Vol. 39 (8): 844-850 [Abstract] ( 44 ) [HTML 1KB] [ PDF 1482KB] ( 640 )
851 Effects of different measures on soil desalination andcotton physiological characteristics
WEN Lijun,SHI Wenjuan*,HE Zijian,GAO Zhiyong,SHI Xiaoxiao
In order to investigate the effects of different improvement measures on soil desalination and cotton growth in the field with drip irrigation under mulch, which would provide helpful and important information for improving saline-alkali land in Xinjiang, China,three improvement measures including the biological method with intercropping(alfalfa + cotton, cumin + cotton, Suaeda salsa + cotton), the chemical method with different doses of gypsum in soil(0.75 kg/m2, 1.50 kg/m2, 2.25 kg/m2), the comprehensive method combined with biological and chemical methods(alfalfa + gypsum, cumin + gypsum, Suaeda salsa + gypsum)were adopted, and the no-measure in cotton field is considered as controls and the total is 10 treatments. The results showed that compared with the control, the three improvement measures were all effective in decreasing soil salt content and increasing cotton yield to some extent. Among the treatments, the intercropping with alfalfa and cotton performed best, with the desalination rate of 56% and 20.9% for the whole soil layer and the bare soil strip between plastic mulches respectively; the treatment for the comprehensive method with Suaeda salsa combining gypsum made the highest yield by 22.4% increase. The accumulation of Na+ and Cl- occurred at the bare soil strip for chemical and comprehensive improvement measures at the end of the growing period, but this occurred at the wide line for biological improvement measures. The transpiration rate, stomatal conductance and photosynthetic rate of cotton were increased for all improvement measures compared with the control, and their main orders were: comprehensive meausres > chemical measures > biological measures > controls. All measures improved water use efficiency and irrigation water efficiency to some extent compared with the controls, their main order were: biological measure < chemical measure < comprehensive measure. In general, the different improvement measures would lead to quite different effects, the biological improvement mesures for intercropping with alfalfa and cotton will be the best method if soil desalination effect is only considered,and, the comprehensive measure for Suaeda salsa combined with gypsum treatment will be the best method if yield increase and water use efficiency are consi-dered for cotton field with drip irrigation under mulch in Xinjiang.
2021 Vol. 39 (8): 851-858 [Abstract] ( 40 ) [HTML 1KB] [ PDF 2605KB] ( 496 )
859 Water distribution uniformity of micro spray belt in different growth stages of wheat
XU Ru,WANG Wen′e*,HU Xiaotao
In the experiment, the common mechanical perforated Ф32 micro spray belt was taken as the research object. By adjusting the working pressure of the micro spray belt, the change rule of water distribution uniformity coefficient in different growth periods of spring wheat under two kinds of length micro spray belts(20 m and 40 m)was studied. Through the analysis of water distribution uniformity coefficient under the shelter of different height spring wheat, the water distribution uniformity of the micro spray belt in the field experiment was explored. The results show that crop shelter can reduce the uniformity of water distribution in the micro spray belt, change the spatial distribution characteristics of water, and different crop height the intercept different amounts of water. By changing the working pressure, the spray angle can be changed, so as to reduce the influence of crop shelter on the water distribution of the micro spray belt. Under the experimental setting conditions of this paper, the best working pressure range under two laying lengths is 40-45 kPa. In order to ensure better irrigation uniformity, the limit laying length of the applied pressure strip and the micro spray strip should be set reasonably.
2021 Vol. 39 (8): 859-864 [Abstract] ( 58 ) [HTML 1KB] [ PDF 2120KB] ( 528 )
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