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Journal of Drainage and Irrigation Machinery Engin
 
2021 Vol.39 Issue.7
Published 2021-07-25
1
2021 Vol. 39 (7): 1- [Abstract] ( 9 ) [HTML 1KB] [ PDF 968KB] ( 241 )
2
2021 Vol. 39 (7): 2- [Abstract] ( 19 ) [HTML 1KB] [ PDF 1257KB] ( 295 )
649 Optimization design of hydraulic model for seawater desalination energy recovery turbine
ZHANG Desheng,QI Bing*,ZHAO Ruijie,ZHANG Qi
In order to improve the recovery efficiency of the seawater desalination energy recovery turbine in the reverse osmosis seawater desalination system. The hydraulic model of turbine impeller was optimized, and the influence law of the interaction on turbine impeller geometric parameters its performance was analyzed, and the geometric parameters of turbine impeller with best performance were obtained. The inlet angle, outlet angle and number of blades were taken as test factors,turbine head and hydraulic efficiency were taken as test indexes. The multiple parameter combination numerical calculation of turbine was carried out based on the BBD test design method, and the response surface analysis method was used to process and analyze the test data. The regression equation between test factors and test indexes was established. The results show that when the inlet angle of turbine blade is 28.8°, the outlet angle is 23.3°, and the number of blades is 7, the hydraulic performance of the turbine is the best. Under design condition, the head of the optimized turbine is 6 m higher than that of the prototype, and the efficiency of the optimized turbine is 0.8% higher than that of the prototype. The number of blades has a great influence on the turbine head and efficiency. The blade number has significant effect on the turbine performance. The contribution rate of blade outlet angle to turbine head is larger than that of blade inlet angle, and the contribution rate of blade inlet angle to turbine efficiency is greater than that of blade outlet angle.
2021 Vol. 39 (7): 649-654 [Abstract] ( 20 ) [HTML 1KB] [ PDF 3035KB] ( 401 )
655 Influence of multi-parameter optimization design on hydraulic performance of water-jet propulsion assembly
ZHANG Yan,WANG Luyi,ZHONG Jinqing,LONG Yun*
Water-jet propulsion pump was optimized by adjusting the shaft strut blade number, the shaft strut blade outlet angle, the distance between the shaft strut and the impeller, and the tip clea-rance. The flow field of a certain type of water-jet propulsion assembly was simulated by CFD, and the influence of different geometric structure parameters on the performance of water-jet propulsion pump was analyzed. The results show that with the increase of the number of blades, the curves of head, efficiency and power gradually are in a downward trend. When the blade number of the shaft strut and the blades is equal to that of impeller, the head and power curve will suddenly drop. When the blade outlet angle of the shaft strut is within the range of(-25°, 25°), the head curve and the efficiency curve show a linear upward trend with the outlet angle of the blade increase. With the increase of the outer diameter length of the suction tube, the entrance area variation decreases, the curve of the head and efficiency gradually decreases, then tends to be flat, and finally increases, and the change of the power shows a downward trend. With the increase of the distance between the shaft strut and the impeller, the head curve gradually rises and then tends to be flat, the power change law is consistent with the head change law, and the efficiency curve first increases and then decreases. With the increase of tip clearance, the work efficiency of the impeller decreases, and the head, efficiency and power curves all show a downward trend. The research results can improve the hydrodynamic performance of the water-jet propulsion assembly, which has great application value to promote the develo-pment of the water-jet propulsion technology, and provides a certain basis for the optimization design of the water-jet propulsion assembly.
2021 Vol. 39 (7): 655-662 [Abstract] ( 26 ) [HTML 1KB] [ PDF 3269KB] ( 493 )
663 Clocking effect of guide vane in multi-stage centrifugal pump
ZHANG Keke,TAN Minggao,*,WU Xianfang,MA Haochen,LIU Houlin,
To study the influence of clocking effect on the performance of multi-stage centrifugal pump, the RNG k-ε turbulence model was used to simulate the flow field in the two-stage centrifugal pump under different guide vane clocking positions. Six schemes were designed for one time position when the secondary guide vane relative to the primary guide vane was rotated with clockwise 10 degrees. The results indicate that under the design flow rate, compared with that of no clocking scheme, when the clocking angle of the second guide vane is half of the angle between the guide vanes, the increase of the pump head and efficiency reaches the maximum value, up to 0.18% and 0.16%, respectively. With the increase of flow rate, the influence of clocking effect of guide vanes on pump perfor-mance gradually increases. With the increase of the clocking angle of the secondary guide vane, the dominant frequency amplitude of pressure fluctuation at each monitoring point first decreases and then increases. When the staggered angle of the first and second guide vanes is 30°, the amplitude of the dominant frequency amplitude of pressure fluctuation reaches the minimum, which is 34.3% lower than that of the no clocking scheme. The change of the clocking position can effectively reduce the inter-stage vortex area and intensity, thereby reducing the intensity of the pressure fluctuation in the pump.
2021 Vol. 39 (7): 663-670 [Abstract] ( 30 ) [HTML 1KB] [ PDF 3294KB] ( 341 )
671 Robust optimization design on impeller of mixed-flow pump
ZHAO Binjuan*,LIAO Wenyan,XIE Yuntong,HAN Luyao,FU Yanxia,HUANG Zhongfu
To increase the robustness of the optimization solutions of the mixed-flow pump, the impeller was firstly indirectly parameterized based on the 2D blade design theory. Secondly, the robustness of the optimization solution was mathematically defined, and then calculated by Monte Carlo sampling method. Thirdly, the optimization on the mixed-flow pump′s impeller was decomposed into the optimal and robust sub-optimization problems, to maximize the pump head and efficiency and minimize the fluctuation degree of them under varying working conditions at the same time. Fourthly, using response surface model, a surrogate model was established between the optimization objectives and control variables of the shape of the impeller. Finally, based on a multi-objective genetic optimization algorithm, a two-loop iterative optimization process was designed to find the optimal solution with good robustness. Comparing the original and optimized pump, it is found that the internal flow field of the optimized pump has been improved under various operating conditions, the hydraulic performance has been improved consequently, and the range of high efficient zone has also been widened. Besides, with the changing of working conditions, the change trend of the hydraulic performance of the optimized pump becomes gentler, the flow field distribution is more uniform, and the influence degree of the varia-tion of working conditions decreases, and the operating stability of the pump was improved. It is concluded that the robust optimization method proposed in this paper is a reasonable way to optimize the mixed-flow pump, and provides references for optimization problems of other fluid machinery.
2021 Vol. 39 (7): 671-677 [Abstract] ( 17 ) [HTML 1KB] [ PDF 2335KB] ( 291 )
678 Simulation of pressure fluctuation and flow induced noise of pump turbine in load rejection of pumped storage unit
FENG Jun,MAO Xiuli*,ZHENG Yuan,CHEN Diyi,DONG Zhenghao
In order to investigate the characteristics of pressure fluctuations and its influence on flow induced noise in the transient process of load rejection under pump turbine power generating mode. A domestic pumped storage power station unit was taken as the research object. Based on the mesh sliding technique and the separated vortex turbulence model of detached eddy simulation, three-dimensional calculating of transient period was carried out by ANSYS software. The pressure signals acquired from flow field was treated as a source for the further study the flow induced noise in sound field by using LMS software. The results show that the flow field in two vaneless regions was widely divergent, which due to the different influence form rotor-stator interaction(between stay vane and guide vane)and rotor-rotor interaction(between guide vane and runner). The change trend of pressure on both sides of guide vane was completely different. The main frequency of pressure fluctuation from runner passage was located at blade passing frequency(St=0.676 3). The sound pressure field noise distribution in pump turbine presents obvious dipole characteristics, which become extremely serious under small flow condition(smaller than 0.2QBEP), wherein the maximum sound pressure reaches at 130.00 dB and the minimum sound pressure value is 9.67 dB. The pulsations of sound pressure level were similar at diffe-rent moments in external sound field of pump turbine, the overall trend was that the intensity of sound pressure increases as the flow reduction. However, the change of flow rate has no effect on the distribution pattern of noise which indicates that the improvement of pressure fluctuation in pump turbine was a way to decrease the sound level of flow induced noise.
2021 Vol. 39 (7): 678-684 [Abstract] ( 19 ) [HTML 1KB] [ PDF 3700KB] ( 334 )
685 Effect of low modulus sodium silicate on mechanical properties of rubber lightweight aggregate concrete
MA Kuaile,WANG Hailong*,LIU Simeng,YANG Hong,ZHANG Jiahao,WANG Hui
In order to understand the influence of different dosages of sodium silicate on the mechanical performance of Rubber Lightweight Concrete(RLC), sodium silicate was added into rubber lightweight aggregate concrete(RLC)and 20% fly ash was used instead of cement. The concrete blocks with content of 0, 2%, 4%, 6% and 8% sodium silicate were prepared. Through NMR to study the microscopic change and strength formation mechanism. The logarithmic function curve prediction and BP neural network strength prediction were carried out to judge the reliability and compare the advantages and disadvantages. The results show that the compressive strength of RLC increases first and then decreases with the addition of sodium silicate, and the best content of sodium silicate is 2%. The mechanical properties of 80-mesh RLC are almost the same as the optimal group(20-mesh RLC group)with 28 d, and the mechanical properties can be improved by adding appropriate amount of sodium silicate. After the addition of sodium silicate, the porosity shows a tendency of first decreasing and then increasing, which indicates that the addition of appropriate content of sodium silicate can optimize the pore structure of concrete and improve the strength of concrete. The prediction models of curve fitting and BP Neural Network are established. Both models can be used to predict the concrete age strength, but the stability, reliability and comprehensiveness of parameters of the BP-neural network prediction model are better than those of curve fitting models.
2021 Vol. 39 (7): 685-691 [Abstract] ( 25 ) [HTML 1KB] [ PDF 2015KB] ( 377 )
692 Frost resistance and microstructure of rubber pumice concrete
LIU Simeng,WANG Hailong*,SUN Song,WANG Hongshan,YANG Hong,WANG Zi
In order to explore the change law of macro performance properties and pore structure of rubber pumice concrete under freeze-thaw cycles, the freeze-thaw cycles and uniaxial compression test were carried out. The frost resistance of rubber pumice concrete was analyzed by scanning electron microscope(SEM)and nuclear magnetic resonance(NMR)technology, and the prediction model of frost resistance of rubber pumice concrete was established. The results show that the addition of 0.12-0.18 mm rubber can effectively reduce the surface erosion, internal damage and the attenuation of mechanical properties of pumice concrete under freeze-thaw conditions. when the freeze-thaw time is 200 the mass loss rate of pumice concrete with 0.15mm rubber is the smallest, up to -0.14%, and the re-lative dynamic modulus of elasticity is the largest, up to 67.36%. Under the freeze-thaw cycles, the internal pores of rubber pumice concrete will deteriorate, the small pores gradually evolve to the large pores, and the harmless pores and less harmful pores evolve to the harmful pores and more harmful pores. The addition of 0.12-0.18 mm rubber particles can effectively inhibit the deterioration of pores and make the internal structure of concrete more compact. According to the prediction model of frost resistance of rubber pumice concrete, the frost resistance period of pumice concrete with 0.15 mm rubber is the longest, which is 12.76% longer than that of ordinary pumice concrete.
2021 Vol. 39 (7): 692-698 [Abstract] ( 33 ) [HTML 1KB] [ PDF 2704KB] ( 356 )
699 Numerical simulation of cavitation and Analisis of flow characteristic of thermo-sensitive fluid
YANG Qiwen,ZHANG Wei,LI Xiaojun*,CHEN Feng,ZHU Zuchao
In order to describe and capture the cavitation flow patterns in thermal-sensitive fluid. Consi-deration the thermodynamic effects, the cavitation model based on the Zwart-Gerber-Belamri(ZGB)model was coupled with the heat transfer and vapour-liquid two-phase state equations was modified to describe and capture the cavitation characteristics of thermal-sensitive fluid. The model was va-lidated by the cavitation flow around a 2D hydrofoil, and the results agreed well with the experimental data of Hord in NASA. The results show that the simulation results by the modified ZGB cavitation model for thermal cavitation flow simulation results are more consistent with the experimental results, especially on the prediction of the temperature and pressure distribution on the hydrofoil surface. Subsequently, the modified ZGB cavitation model was used to investigate the cavitation characteristics of fluoroketone around NACA 0015 hydrofoil, and the evolution process of cavitation flow shedding was compared with Kelly′s experimental data. During the process, the shedding of the cavity near the three-dimensional hydrofoil and its evolution process can reasonably predict. The applicability of the modified ZGB cavitation model for different thermo-sensitive fluids was further proved. Finally, the dynamic cha-racteristics of thermal fluid periodic cavitation shedding were identified and analyzed. The results show that the isosurface of Ω is similar to the shape of the cavity shedding, which indicates that the cavity shedding region shows large-scale vortex motion. The growth and shedding of the cavity cause a significant temperature drop on the hydrofoil wall surface, and the B-factor can effectively predict the temperature drop in the cavity.
2021 Vol. 39 (7): 699-705 [Abstract] ( 37 ) [HTML 1KB] [ PDF 5192KB] ( 450 )
706 Design of test rig for water-lubricated thrust bearing and thrust disk
BAI Yuxing,KONG Fanyu*,SHEN Yong,WANG Jiaqiong,GU Xinyan
In order to completely study the external performance of thrust disc and the water film characteristics of thrust bearings, break the technical bottleneck of compact big-power wet motor, ensure that the thrust disc as auxiliary impeller could balance the axial thrust and provide the head for water circulation in the motor when the pump is in operation, a comprehensive test rig for water lubricated thrust bearings and thrust disc was designed and built. The test rig consists of main test section, axial thrust test unit, sensor unit and control unit, etc. The hydraulic performance of the thrust disc, water film bearing capacity and film thickness were acquired by using the test rig at six rotative speeds such as 1 500, 2 000, 3 000, 4 000, 5 000, and 6 000 r/min. The measured water film thickness was validated with the thickness predicted by employing a numerical method. The results show that the data obtained on the test rig is accurate and reliable. The water-lubricated thrust bearings and thrust disc integrated test rig can provide a theoretical basis and engineering guidance for further investigations in related fields, and has important meaning.
2021 Vol. 39 (7): 706-711 [Abstract] ( 34 ) [HTML 1KB] [ PDF 3428KB] ( 410 )
712 Comprehensive evaluation of water and fertilizer application for Lycium barbarum L. based on AHP and entropy weight method
DENG Zhen,YIN Juan*,WU Junbin,ZHANG Haijun
In order to explore the comprehensive effects of water and fertilizer application on the growth, yield and quality of Lycium barbarum L., and obtain the optimal water and fertilizer application, three different irrigation quota(194, 254 and 313 mm)and three different fertilizer rates(135-45-90, 180-60-120 and 225-75-90 kg/hm2)in total nine combinations were set as experiment factors, and a completely random design was carried out. The comprehensive evaluation method of AHP and entropy weight method was used 4 kinds of first grade indexes and 12 kinds of second grade indexes of Lycium barbarum L. and the comprehensive evaluation model for water and fertilizer scheme of Lycium barbarum L. was established. The AHP and entropy weight method were optimized by the least square method to calculate the comprehensive evaluation weight, and the comprehensive evaluation weight was classified by the natural discontinuity method, which was used as the basis for the decision of water and fertilizer combined application scheme. Then, taking the comprehensive eva-luation index as the dependent variable and the irrigation quota and total fertilizer amount as the independent variables, the stepwise binomial regression analysis was carried out to establish the regression equation. The regression equation was established to analyze the influence of the water and fertilizer coupling on the comprehensive evaluation index, and the corresponding water and fertilizer distribution scheme was determined when the comprehensive evaluation index was the largest. The results show that the comprehensive evaluation value of Lycium barbarum L. increase first and then decrease with the increase of water and fertilizer application amount, which is consistent with the actual production. Among all kinds of factors, the grain size, 100 grain weight, dry yield and total sugar have a greater influence on the comprehensive evaluation index of Lycium barbarum L. growth, accounting for more than 73.3% of the total evaluation index. Based on the evaluation of AHP and entropy weight method, the optimal water and fertilizer scheme for the Lycium barbarum L. is obtained as follows: the irrigation quota is 252-278 mm(excluding spring and winter irrigation), and the fertilizer amount(N-P2O5-K2O)is 197-66-131 kg/hm2 to 203-68-135 kg/hm2.

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2021 Vol. 39 (7): 712-719 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1688KB] ( 377 )
720 Mechanical properties and pore characteristics of aeolian sand concrete
XUE Huijun,SHEN Xiangdong*,HOU Yufeng,LIU Zongxu,ZHENG Jianting
In order to solve the problem of uneven distribution of natural river sand and resource shor-tage in northwestern of China, aeolian sand concrete was prepared by using the aeolian sand of Kubuqi Desert to replace part of natural river sand as fine aggregate. The experimental study on aeolian sand concrete was carried out through the cube compressive strength, splitting tensile strength and nuclear magnetic resonance porosity. The research results show that with the increase of the aeolian sand content, the early cubic compressive strength value and the splittling tensile strength value of the aeolian sand concrete both first increase and then decrease. The aeolian sand content with 20%, 30% and 40% concrete can meet the design strength requirements. With the increase of the curing age, the cubic compressive strength and splitting tensile strength of each group of aeolian sand concrete specimens increase differently, and the strength value of concrete with 30% aeolian sand has the largest increase. The T2 spectrum of aeolian sand concrete has three characteristic peaks. With the increase of curing age, the large pores in the concrete develop towards small pores. As the amount of aeolian sand increases, the porosity first decreases and then increases. The gel pores and pores show a tendency to increase first and then decrease. This research can provide a theoretical basis for the application and promotion of aeolian sand concrete in water conservancy projects in arid and semi-arid areas in China.
2021 Vol. 39 (7): 720-726 [Abstract] ( 39 ) [HTML 1KB] [ PDF 2775KB] ( 506 )
727 Effect of nitrogen supply levels on root morphology and nutrient absorption of rice plants at heading stage
DAI Han,WANG Xiaohui,DENG Yingping,LI Xumeng*
In order to study the effects of different nitrogen supply levels(5 different treatments named CK, N1, N2, N3 and N4 with nitrogen concentration of 0, 25, 50, 75 and 100 mg/L were set)on the root morphology and nutrient absorption of rice plants at heading stage. In this study, Huang Huazhan and Jingliangyou1468 were used as the research objects. The pot experiments were conducted by hydroponics, and the effects of nitrogen supply level on the morphology and nutrient absorption of rice roots at the heading stage were discussed. The results show that the percentage of total root length, total root volume and total root surface area of Huanghua increase by 4.62%, 189.58% and 36.63%, respectively, under N2 treatment. The total root length, total root volume and total root surface area of Jingliangyou1468 increase by 13.84%, 55.76% and 54.17%, respectively. The dry mass of roots, stems and leaves of Huang Huazhan and Jingliangyou1468 increase by 71.51%, 39.94%, 104.04%, and 90.38%, 46.53%, and 67.07%, respectively. Therefore, the total root length, total root volume and total root surface area of Huang Huazhan and Jingliangyou1468, as well as the dry mass of roots, stems and leaves, all increase first and then decrease with the increase in the concentration of the culture liquid nitrogen. The variation law is in accordance with the quadratic function relationship. When the nitrogen supply level is 50 mg/L, Huang Huazhan and Jingliangyou1468 are the most suitable for rice growth.
2021 Vol. 39 (7): 727-732 [Abstract] ( 29 ) [HTML 1KB] [ PDF 3390KB] ( 367 )
733 Application of grey theory on the physiological characteristics of drip irrigation processing tomato in salinized soil
ZHANG Jifeng,WANG Zhenhua*,ZHANG Jinzhu,HOU Yusheng,REN Zuoli
To investigate the effects of saline-alkali stress on photosynthetic physiology and water and fertilizer-use efficiency of processing tomato, the grey correlation theory was used to study the relationship between physiological indexes and yield and to determine the favorable range of saline content for processing tomato. The soil used was artificially prepared with four kinds of salt contents: non saline alkali soil(CK),mild saline alkali soil(S1), moderate saline alkali soil(S2), and severe saline alkali soli(S3). The salt mass ratio was 1.5,4.0,7.0 and 10.0 g/kg,respectively. The results showed that compared with CK treatment, S1 treatment had no inhibition on the physiological indexes and fertilizer-water efficiency of processing tomato. To a certain extent, S1 treatment improved the photoelectron transfer efficiency and photosynthetic capacity of processing tomato. Water use efficiency was equal to that of CK, and partial productivity of nitrogen fertilizer increased by 3.85%, and the yield increased by 1.28%. The S2 and S3 treatments were significantly more stable than that of CK. The photosynthetic fluorescence parameters decreased to different extents. Intercellular CO2 concentration and the maximum photoche-mical efficiency of PSⅡ increased significantly during the middle and late growth stages. The S3 treatment inhibition phenomenon was the most significant. Compared with CK, the water and fertilizer utilization efficiency of treatment S3 decreased by 52.27% and 50.00%, and the yield reduction rate of processing tomato was 51.91%. The growth process of S2 and S3 treatments were faster than that of CK and S1 treatment, and the physiological indicators reached the maximum in the whole growth period in advance. The results showed that the yield of processing tomato was highly correlated with net photochemic rate(Pn),transpiration rate(Tr)and non photochemical quenching coefficient(NPQ). Combined with the physiological rules of the above three parameters, it can be concluded that the soil salt mass content suitable for processing tomato was 1.5-4.0 g/kg.

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2021 Vol. 39 (7): 733-739 [Abstract] ( 18 ) [HTML 1KB] [ PDF 2240KB] ( 312 )
740 Application of instantaneous speed fluctuation signal in fault diagnosis of axial piston pump
GU Lichen,MA Ziwen*,TIAN Qingqing,SUN Yu
In view ofthe fact that most of the signals used in valve plate wear fault diagnosis of axial piston pump have non-stationary and nonlinear characteristics. Therefore, a fault diagnosis method of valve plate wear based on instantaneous speed fluctuation(ISF)of axial piston pump was proposed in this paper. In order to overcome the shortcomings of the traditional monitoring signals, the ISF signal has good anti-noise performance and can be transformed into a stable signal in the angle domain after order analysis. The causes of instantaneous speed fluctuation of axial piston pump were revealed through dynamic analysis. The results show that for the axial piston pump with Z pistons, the piston inertia force and the Coulomb friction force at the cylinder/valve plate pair will produce the torque fluctuation Z times the rotational frequency, which will produce a Z-order ISF on the main shaft of the axial piston pump. The change of the pressure in the high pressure cavity of the plunger will produce a torque fluctuation 2Z times of the rotational frequency, which will generate a 2Z-order ISF on the main shaft of the axial piston pump. The theoretical results were verified by experiments under the condition of variable load. The results show that for the axial piston pump with 9 pistons, the variation of the amplitude of the 9th order ISF component can well reflect the different wear condition of the valve plate. With the increase of wear degree of the valve plate deteriorates, the maximum amplitude of the 9th order ISF increases from 1.229 r/min to 2.023 r/min. The amplitude of the 9th order ISF component increases with the aggravation of the valve plate wear.
2021 Vol. 39 (7): 740-746 [Abstract] ( 30 ) [HTML 1KB] [ PDF 4548KB] ( 363 )
747 Development of intelligent operation monitoring system for irrigation pump
LUO Yin*,HAN Yuejiang,DONG Jian
For the purpose of improving the irrigation pump performance, reducing the energy consumption and ensuring the quality of irrigation water, an intelligent monitoring system for irrigation pump based on the single chip microcomputer STM32F103ZET6 was developed, which has the ability to acquire the irrigation pump performance parameters and irrigation water quality information in real time. The developed system mainly consisted of the MCU core control module, the water quality monitoring module, the voltage and current signal acquisition module, the GPRS communication module, the monitoring information display module and the power supply module. These functional modules were designed and accomplished both in hardware and software, and combined to multi operation and information display platform to realize the real time monitoring of irrigation pump. A prototype was manufactured and experiments were conducted to verify its reliability. Experimental results show that the system is worked normally and the monitoring information update frequency of the intelligent monitoring system is maintained at 2 000 Hz stably, and the monitoring error of each parameter is controlled within 5%.

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2021 Vol. 39 (7): 747-756 [Abstract] ( 24 ) [HTML 1KB] [ PDF 3959KB] ( 335 )
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