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Journal of Drainage and Irrigation Machinery Engin
 
2021 Vol.39 Issue.10
Published 2021-10-25
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2021 Vol. 39 (10): 1- [Abstract] ( 28 ) [HTML 1KB] [ PDF 1356KB] ( 316 )
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2021 Vol. 39 (10): 2- [Abstract] ( 23 ) [HTML 1KB] [ PDF 1317KB] ( 322 )
973 Optimal design of geometric parameters of diffuser inlet under optimal working conditions
LIU Zailun*,WANG Sanzhen,ZHANG Jingmin,WANG Jinxuan
Through the determination of the best operating point of the well-used submersible pump, the characteristic equation of thediffuser under the optimal working condition is obtained, and the analysis shows that there is a certain relationship between the geometric parameters of the inlet of the diffu-ser(the angle and width of the inlet). In order to verify the relationship between the geometric parameters of the diffuser inlet, select 200QJ50 two-stage well submersible pump as the research object, using the method of combining numerical simulation and experiment. Under the combined changes of the diffuser inlet angle and inlet width, 16 sets of submersible pump models was established to study the performance change law and internal flow field of well submersible pumps. The results show that when the geometric parameters of the inlet of the guide blade are selected in accordance with the characteristic equation of the diffuser under the optimal working conditions, the hydraulic loss of the diffuser can be reduced and the pump performance can be improved. Comparing the inlet placement angle obtained by bringing the given inlet width into the characteristic equation of the diffuser under the optimal working condition and the corresponding simulated optimal angle under the inlet width, both difference between within 1°, it shows that using the characteristic equation of the diffuser under the optimal working conditions to select the geometric parameters of the diffuser inlet has certain accuracy, which provides a reference for the optimal design of the diffuser.

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2021 Vol. 39 (10): 973-980 [Abstract] ( 28 ) [HTML 1KB] [ PDF 2256KB] ( 490 )
981 Analysis on rotor strength and mode of pump-turbine with splitter blades
ZHANG Jinfeng,SONG Haiqin*,ZHANG Fan,CAI Haikun,LAI Liangqing,HONG Qiuhong
This study considered a model of a pump-turbine with splitter blades operating in pump mode. Vibration characteristics of the rotor of the pump was analyzed based on CFD and FSI methods. Steady simulations of flow conditions under three opening degrees; small opening degree of 9.8°, optimal opening degree of 17.5° and the large opening degree of 24.8° were conducted. The results under rated working conditions were imported into the rotor structure to realize unidirectional fluid-structure coupling. Further, deformation and equivalent stress of the rotor with pre-stress were analyzed and the wet and dry modes of the runner were also calculated to analyze vibration characteristics of the runner under different conditions. The analysis revealed that deformation of the runner under the pre-stress corresponding to different openings is basically the same as the equivalent stress distribution and the deformation of the runner mainly occurs on the low-pressure side of the upper crown. In addition, vibration sectors were divided in the circumferential direction to describe the characteristics of the vibration shape according to the number of pitch diameters. It was found that the relative amplitude of the low-pressure side of the upper crown and lower ring of the runner in each sector is relatively large. Furthermore, the additional mass of water in the wet mode has little effect on the modal characteristics of the runner, but it will have a significant impact on the amplitude. Lastly, the influence of pre-stress on the natural frequency of the structure is small and can be ignored, while the natural frequency of the structure will decrease significantly in the wet mode,indicating that the additional mass effect of water should be fully considered when the vibration characteristics of the structure is analyzed.
2021 Vol. 39 (10): 981-986 [Abstract] ( 37 ) [HTML 1KB] [ PDF 21188KB] ( 287 )
987 Wear of large solid particles on the impeller of solid-liquid two-phase flow pump
SONG Longbo,TENG Shuang,CAO Qian,KANG Can*,DING Kejin,LI Changjiang
In order to describe the wear of the impeller of the pump transporting the solid-liquid two-phase flow containing large solid particles, commercial computational fluid dynamics(CFD)software STAR-CCM+ was used to implement numerical simulations. The numerical scheme was validated through the experimental results obtained in a curved pipe. Effects of the concentration of the medium and solid particle diameter on performance of the pump and wear characteristics were investigated. The results show that the distribution of solid particles in the pump is uneven, and the work done by the blade working face causes the particles to hit the blade at a high speed, which is the key factor of blade wear. The wear of the impeller mainly occurs at the inlet and back of the blade, and the wear of the primary impeller is always greater than that of the secondary impeller. The increase of medium concentration will lead to the increase of impeller wear. When the particle size increases from 25 mm to 30 mm, the wear rate of the primary impeller and the secondary impeller increases sharply, and the wear of the impeller increases. When transporting small particles, the inlet angle of blade should be optimized to reduce the wear of small particles on the inlet edge of blade. When conveying large particles, the profile of blade should be optimized to reduce the wear of large particles on the back of blade.
2021 Vol. 39 (10): 987-993 [Abstract] ( 66 ) [HTML 1KB] [ PDF 3352KB] ( 476 )
994 Research on inflow and energy conversion characteristics of centrifugal pump as turbine in different conditions
LIN Tong*,XIE Jing,XIE Renhua
To reveal the energy conversion characteristic of the pump as turbine(PAT)under different discharges, a single-stage cantilever centrifugal pump with the specific speed of 90 under the turbine mode was studied. By applying the finite volume method(FVM)to simulate the performance of diffe-rent flow rates, the accuracy of numerical simulation was validated by experimental results. The results show that the impeller is the main component of hydraulic loss in PAT. With the discharge increasing, the proportion of hydraulic loss in the impeller shows the tendency of decreasing first and then increa-sing. Under the design operating condition(Q=80 m3/h), the proportion of hydraulic loss of volute, impeller and cavity is 33%, 35.1% and 22.3%, respectively. By analyzing the distributions of stream-lines and velocity triangle at the inlet of the blade under different conditions, the relation between the flow characteristic and the hydraulic loss was revealed. The flow in the impeller is uniform and without vortex. However, the poor flow characteristic can be observed with the discharge deviating from the design condition. The backflow occurs at the inlet of the impeller under the part-flow condition, and the vortex occurs at the suction side of the blade under the large-flow condition. Finally, to further research the mechanism of energy conversion, enstrophy coefficient was utilized to analyze the hydraulic loss from the aspect of energy. The research results could provide references for the efficient design and operating of PAT.

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2021 Vol. 39 (10): 994-1000 [Abstract] ( 40 ) [HTML 1KB] [ PDF 5691KB] ( 486 )
1001 Analysis of flow characteristics of vertical inline pump during shutdown transition process caused by power failure
ZHANG Chenying,PEI Ji,YUAN Shouqi,WANG Wenjie*,GAN Xingcheng,DENG Qifan,ZHAO Jiantao,ZHANG Benying
In order to explore the inner unsteady flow characteristics of the vertical inline pump during the power-off transition process, the numerical simulation method coupled with a Fortran program based on the commercial CFD code CFX was adopted to predict the flow motions in the pump. The angular momentum differential equation was used to predict the variation law of the rotating speed. The flow rate, rotating speed and other parameters as well as the flow velocity distributions during the transient process of the power-off and shutdown of the pump were analyzed. The results show that after power failure, the speed gradually decreased from positive speed to reverse speed and increased to runaway speed(nmax=1.206 n0). There was a delay between the speed and the flow rate, the former reached the zero point 1.24s later than the latter; the amplitude of pressure pulsation reached the hig-hest value in the runaway stage. At the beginning of the transition process, several vortices were observed in the inlet passage, impeller channel and volute. In the middle stage, the vortex gradually disappeared, and the flow pattern tended to be stable. In the later stage, small vortices appeared in the inner side of the second bend and the outlet of the curved inlet pipe. The research reveals the transient flow features in the process of the inline pump shutdown, which provides a fundamental theory for the safe operation of pump shutdown.
2021 Vol. 39 (10): 1001-1007 [Abstract] ( 63 ) [HTML 1KB] [ PDF 2958KB] ( 406 )
1008 Numerical simulation of hydraulic characteristics of three-side inlet of vertical shaft inlet channel of horizontal pumping station
JIANG Hongying,YAN Hongqin,XIAO Zhongming,CHENG Li*,LIU Hao
Aiming at the optimization design of the vertical shaft inlet passage adopted by a one-way horizontal diversion pump station, a three-side inlet shaft inlet passage is proposed. In order to analyze the hydraulic characteristics of the three-side inlet shaft inlet passage, based on the Rey-nolds time-averaged NS equation and k-ε standard turbulence model, the CFD technology is used to numerically simulate the three-side inlet shaft flow channel of the horizontal pumping station, and different three-side inlet channels are formed by controlling the line type and the width b of the middle pier, so as to analyze. The hydraulic characteristics of the different three-side inlet channel, specifically analyze the axial velocity distribution of the outlet section of the inlet flow channel of different schemes, the streamline and velocity distribution of the horizontal section, and the flow channel hydraulic loss. The results show that for the three-side inlet channel under different widths of the middle pier, the streamlined middle pier has a larger flow velocity distribution uniformity and the velocity-weighted average angle than the rectangular middle pier. The streamlined middle pier can obtain a better flow pattern. The streamlined middle pier, as the width b of the middle pier decreases, the cross-sectional area gradually increases, and the uniformity of the flow velocity distribution and the speed weighted average angle of each scheme gradually increase. When b=0.075B, The pressure distribution on the inlet section of the is streamlined middle pier pump more even than that of the rectangular middle pier.
2021 Vol. 39 (10): 1008-1013 [Abstract] ( 31 ) [HTML 1KB] [ PDF 8159KB] ( 350 )
1014 Analysis of pumping station swing signal based on improved LMD
PAN Hong*,TANG Wei,ZHENG Yuan,YU Yang
The local mean decomposition(LMD)method presents unique analysis ability for processing nonlinear and non-stationary signals. It is especially suitable for signal analysis of pumping units. However, in the process of decomposition a non-stationary signal into several proper rotation components, due to the error of the local mean and envelope estimation function at the data endpoint. When the endpoint effect appears, which results in the distortion of signal decomposition in serious cases. To solve this problem, considering the curve amplitude and geometry shape similarity, an endpoint effect suppression method based on grey B correlation and Euclidean distance was proposed. In order to evaluate the effect of the endpoint suppression method, an evaluation criterion of the change of signal energy before and after the decomposition was defined. Compared with the original LMD method and the image mapping method and waveform matching method, the effectiveness and superiority of this proposed method is verified. The results of simulation and practical swing signal analysis of pumping station shows that this method can effectively suppress the endpoint effects of LMD, and improve the accuracy of reconstructed signal precision in the process of LMD decomposition, and better extract the fault signal characteristics of swing signal of pumping station unit.
2021 Vol. 39 (10): 1014-1019 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1860KB] ( 339 )
1020 Study on restraining effect of bearing structure on oil mist escaping of hydro generator unit
PANG Jiayang,LIU Xiaobing*,Zeng Yongzhong,Yu Zhishun,Song Han
To perform a deep investigation into the oil mist escaping from the bearing during the operation of the hydrogenerator,without changing the working principle of the oil system, the overall structure of the bearing and the number of bearing bushings, the improved structure of lower guide bearing was designed by adding 4-stage labyrinth seal structure to the oil retaining ring and 4 evenly distributed vent pressure holes with diameter of 8 mm to the top of shaft collar. The VOF two-phase flow model and the SST k-ω turbulence model are the important bases for the numerical simulation of the flow characteristics of the oil-gas mixture in the lower guide bearing structure.According to the analysis of the results, it is found that under the same operation conditions, the oil mist escape amount of the improved structure is reduced by 78.21%, the stability of the flow field in the oil tank is improved, and the number and volume of bubbles in the lubricating oil are reduced. At the same time, it is shown that the pressure difference between the oil tank and the atmoshphere and the sealing performance of the open channel between the oil tank and the outside are the important influencing parameters of the oil mist escaping from the bearing of the hydroturbine generator.The research results can provide gui-dance for hydropower stations to suppress the phenomenon of bearing oil mist escaping.
2021 Vol. 39 (10): 1020-1026 [Abstract] ( 51 ) [HTML 1KB] [ PDF 3069KB] ( 408 )
1027 Experimental study and numerical calculation of water hammer effect of closing valve of ball type regulating valve
CHEN Yafei,GU Weiguo,WANG Dezhong,XU Rui
With respect to the water hammer phenomenon caused by the rapid closing of the ball type regulating valve in the pressurized water reactor nuclear power plant, both experimental method and numerical calculation were used to study the water hammer effect of the closed valve, and the influence of the closing speed on the water hammer impact waveform was analyzed. The results indicate that with the closing of valve, the pre-valve pressure increases first and then decreases, and the post-valve pressure first decreases and then increases. The pre-valve pressure peak and the post-valve pressure valley are reached almost simultaneously, which are accompanied by pressure fluctuations that decay rapidly over time. The water hammer effect of the closing valve has a stronger impact on the pipeline before the valve. In addition, the positive pressure before the valve and the negative pressure after the valve will produce a resultant force, which causes a greater water hammer impact on the valve body structure. When the valve closing time increases from 3 s to 5 s, the water hammer impact force can be reduced and the water hammer impact waveform can be changed as well. Based on the classical water hammer equation and characteristic line method, the calculation software was independently developed, and a set of numerical calculation methods for quickly analyzing the transient performance of valve closing and water hammer impact effects was established. By comparing the experimental data, the reliability of the software was verified. The calculation software can predict the valve closing dynamic process and pipeline water hammer phenomenon, which can support related practical engineering applications.
2021 Vol. 39 (10): 1027-1032 [Abstract] ( 43 ) [HTML 1KB] [ PDF 2022KB] ( 486 )
1033 Parameter uncertainty analysis of solar-hydro complementary power generation system
LI Lin,CHEN Diyi*,ZHANG Jingjing,LI Huanhuan,TIAN Yu,YUE Yan
In order to give full play to the complementary generation characteristics of the system,this study aimed to present a promising solar-hydro generating system by Simulink, including the hydro-turbine governor system, the solar power generation system and the power system and load. On the basis of verifying the correctness of the model, the power complementary process of the system is simulated in second scale, and the parameter uncertainty of hydropower system is conducted to improve the power regulation capacity. The results show that the variations of In, Fr, Eqh, Eqy and Eh have low sensitivities to the regulation steady value of hydropower system, while Eqh and Ey influence largely the regulation steady value where Ey is positive correlation with the regulation steady value and the tiny variation of Eqh may lead to considerable unstablility of hydropower system. The implemented model, methods and results will provide important guidance for renewable energy policy and related risk assessment.
2021 Vol. 39 (10): 1033-1039 [Abstract] ( 43 ) [HTML 1KB] [ PDF 3914KB] ( 379 )
1040 Spatial andtemporal variations of normalized differential vegetation index and its relationship with precipitation in Liaoning Province from 2000 to 2016
LIU Yanwei*,WANG Shuying,JIAO Zhongshuai
Study on the ecological environment protection and drought early warning. The temporal and spatial changes of the normalized differential vegetation index of Liaoning Province from 2000 to 2016 were analyzed based on MOD13A2 data of MODIS remote sensing image. The correlation between normalized difference vegetation index and precipitation was studied. The results showed that the spatial distribution of the NDVI is more obvious in Liaoning Province. It shows that the eastern was the highest, central and south west was higher, lower in northern, the lowest in western. The annual variation of NDVI value in Liaoning Province shows a trend of increasing fluctuation, and the vegetation coverage is increasing. The seasonal variation of NDVI value in Liaoning province presents a single peak type. The maximum is basically in July, and the minimum is in May. There is a correlation between NDVI and precipitation. There is a certain lag between the NDVI and precipitation.
2021 Vol. 39 (10): 1040-1045 [Abstract] ( 45 ) [HTML 1KB] [ PDF 2386KB] ( 542 )
1046 Hydraulic simulation based on PSO for irrigation projects with low-pressure pipe conveyance
GONG Zhihao,JIANG Xiaohong*
The technology of pressurized irrigation with branched networks is promoted on a large scale to alleviate water crisis in China. Continuity equation and energy equation are the basis of hydraulic simulation of pipeline irrigation. In order to simulate the hydraulic performance of pumping station pressurized irrigation projects with low-pressure pipe conveyance, the idea of system optimization is used to develop a mathematical model. In the model, the objective function is to minimize the system′s deviation of water volume and constraints include energy equations of branch pipes. A trial-particle swarm algorithm is proposed to solve the model, which can obtain the actual working points of pumps and the actual discharges of the pipelines and their outlets during the operation of the system. The method was applied to a low-pressure pipe irrigation system in Shanghai and results were compared with those of gradient method. It was proved that TPSA can reduce solving error by 12.3% and solving time by 16.3% at most. The proposed method may help to check the design results of pipe irrigation system, which can meet the development needs of irrigation projects with low-pressure pipe conveyance in China at present.
2021 Vol. 39 (10): 1046-1050 [Abstract] ( 46 ) [HTML 1KB] [ PDF 12880KB] ( 287 )
1051 Distribution of soil water-stable aggrega- tes and organic carbon content affected by tillage systems: a meta analysis
LU Xingli,LI Shanshan,LIU Jihu,DUAN Yaxin,YUE Heng,KANG Jianhong,WU Hongliang
A better understanding of soil carbon(C)distribution within aggregate fractions is essential to evaluating the potential of no-till for sustaining productivity and protecting the environment. A meta analysis on 744 comparisons from 34 studies was conducted to determine the effects of three different tillage treatments(conventional mouldbould ploughing tillage(CT), reduced tillage(RT)and no tillage(NT))on water stable aggregate size distribution, soil C concentration in aggregate fractions. The meta analysis indicates that when compared with CT treatment, NT/RT significantly(P<0.05)increased macro-aggregate above 20 cm by 20.9%—82.2%(>2.00 mm)and 5.9%-19.1%(0.25-2.00 mm), whereas NT/RT significantly reduced micro-aggregate and silt clay fractions above 20 cm. NT/RT significantly(P<0.05)increased the SOC in macro-aggregate(>0.25 mm)and micro-aggregate(<0.25 mm)size classes above 20 cm soil depth as compared with CT. The results suggested soil sampling depth should be considered to evaluate the influence of tillage systems on the distribution of soil aggregate, and the content of aggregate-associated C content.
2021 Vol. 39 (10): 1051-1055 [Abstract] ( 47 ) [HTML 1KB] [ PDF 1651KB] ( 388 )
1056 Effects of water saving and nitrogen reduction on tomato growth and utilization rate of water and nitrogen in greenhouse
LI Xufeng,MA Juanjuan*,SUN Xihuan,SHI Xiaohu,GUO Xianghong,LEI Tao,
To study the sensitivity of tomato growth to water saving at different growth stages and diffe-rent nitrogen application levels, through the greenhouse plot experiment, four irrigation levels and three nitrogen application levels were set.The response of the above-ground and underground growth indexes to different irrigation and nitrogen application levels was analyzed, and the effect of water saving and nitrogen reduction on water and nitrogen utilization rate of tomatoes was studied. The results show that the plant height, stem diameter and yield of tomatoes decreased with the decrease of irrigation and nitrogen application, all reached the maximum value under the treatment of W1N1(conventional water and nitrogen application). However, the characteristic parameters of the whole root first increased and then decreased with the decrease of irrigation and nitrogen application, the total root length, fine root length, total surface area and total volume of tomatoes were the highest under W2N2 treatment(50% water saving at the seedling stage and 300 kg/hm2 nitrogen application), which were 33%, 34%, 46% and 67% higher than those of W1N1, respectively. Conventional irrigation and nitrogen application will promote the development of root system at the surface layer(0-30 cm), while water saving and nitrogen reduction will make root system deeper. The treatment of W2N2 has the most developed root system, the highest utilization efficiency of irrigation water, and the higher nitrogen fertilizer partial productivity. It is the best combination of water saving and nitrogen reduction in this experiment that water(20%)and fertilizer(25%)resources were saved while slightly reducing production(8%).
2021 Vol. 39 (10): 1056-1061 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1435KB] ( 378 )
1062 A design of an IOT irrigation management system with large-scale nodes
WANG Zhiqiang,NIU Dandan,WANG Jiaxing,GAO Xin,WU Hao,XIA Qian,JIANG Yongnian,GUO Ya*
Currently, most of existing agricultural Internet-of-Things(IOT)systems for intelligent irrigation are difficult to meet the needs of practical irrigation monitoring and management with a large range of multiple distribution points. Aiming at the demand of monitoring and management of mass water node for large-scale agricultural irrigation at the present stage, a system was designed to query the data of measurement points and manage the detection sites based on the commonly used MODBUUS-RTU protocol and TCP protocol in industry. The sensor of measurement points can use any flow sensor that meets the requirements of the protocol. Two service processes were designed: IOT server and WEB server. The IOT server is responsible for querying and obtaining data from the electromagnetic flowmeter and uploading it to the database, solving the problems of protocol identification and analysis and high concurrency, and improving the system′s ability to handle a large number of monitoring nodes. The Web server queries the corresponding data information from the database and carries on the permission management to facilitate the expansion of the system scale. In order to facilitate the system management, the WeChat small program with the functions of data query and equipment management was designed and developed. The irrigation IOT system designed in this paper, on the basis of basic irrigation monitoring, takes into account practical problems such as large-scale node deployment, massive data concurrency, system authority control, and provides a feasible solution for water-saving irrigation.
2021 Vol. 39 (10): 1062-1067 [Abstract] ( 46 ) [HTML 1KB] [ PDF 3718KB] ( 412 )
1068 Mechanism of hot corrosion resistance of IN718 superalloy strengthened by laser peening
CHEN Songling,ZHOU Jianzhong,HUANG Shu*,ZHANG Huichun
To study the effects of laser peening(LP)on the hot corrosion resistance properties of IN718 superalloy, samples were subjected by high-power LP treatments, and then the corrosion experiments were performed in hot environment of 800 ℃. The compressive residual stress, microstructure, hot corrosion kinetics curves, surface morphologies and cross-section morphologies of the corrosion layers of LPed and non-LPed samples were compared. Finally, the mechanism of hot corrosion resistance strengthened by LP was revealed. The results show that the compressive residual stress is generated and the grains are refined on the surface of LPed sample. While compared with non-LPed sample, the hot corrosion rate of LPed sample is significantly reduced and the number of the corrosion cracks and pits of LPded samples are decreased. The grain refinement speeds up the formation of protective oxide films on the surface of LPed samples, and reduces the thermal stress and growth stress in the oxide films. The compressive residual stress improves the adhesion of the surface oxide films. In addition, the grain refinement and δ phase precipitating on grain boundaries at high temperature hinders the invasion of sulfur, oxygen and other elements, and slows down the internal sulfurization and oxidation rate. As a result, LP can improve the hot corrosion resistance of IN718 superalloy.
2021 Vol. 39 (10): 1068-1074 [Abstract] ( 37 ) [HTML 1KB] [ PDF 5209KB] ( 412 )
1075 Analysis of vortex action in perforated emitter under different working pressures
XING Shaobo,ZHANG Jinzhu*,WANG Zhenhua,LIU Ningning,
In order to explore the influence of vortex in perforated channel on anti-clogging and energy dissipation performance of emitters, based on the numerical simulation method verified by experiments, the flow field distribution, geometric characteristics of vortex zone, vortex intensity and pressure distribution in four kinds of working pressure channels were analyzed, and the movement of sediment particles with different particle sizes in the emitter was also analyzed. The results show that the vortex zone can continuously wash and clean the side wall of the channel and slow down the accumulation of particles in the perforated channel, and the vortex zone can play an anti-clogging role. The friction between different flow velocity layers, vortex zone and main flow zone, and vortex zone and channel side wall in the vortex zone will consume energy, and the vortex zone can play an energy dissipation role. The vortex can exist stably under different working pressures. The above analysis shows that the vortex zone exists stably under different working pressures, and can improve the anti-clogging and energy dissipation performance of drip irrigation emitters, which can provide reference for anti-clogging and hydraulic performance optimization of emitters.

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2021 Vol. 39 (10): 1075-1080 [Abstract] ( 58 ) [HTML 1KB] [ PDF 2460KB] ( 447 )
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