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Journal of Drainage and Irrigation Machinery Engin
 
2019 Vol.37 Issue.4
Published 2019-04-25

article
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2019 Vol. 37 (4): 1- [Abstract] ( 127 ) [HTML 1KB] [ PDF 2673KB] ( 175 )
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2019 Vol. 37 (4): 2- [Abstract] ( 113 ) [HTML 1KB] [ PDF 270KB] ( 152 )
277 Rotor radial force and pressure fluctuation of the mixed flow pump under different flow conditions
LI Wei*, ZHANG Yang, SUN Bing , SHI Weidong, XU Rongjun
In order to study the unsteady flow characteristics of the mixed flow pump, unsteady calculation on the external characteristics and internal flow field were carried out based on the ANSYS CFX software. The radial force distribution of the rotor and the time domain and frequency domain response of the pressure fluctuation at different monitoring points under different flow conditions are obtained. Besides, the influence of different flow conditions on rotor radial force and pressure pulsation is analyzed. The results show that the numerical results of the external characteristics are in good agreement with the experimental measurements, which shows that the accuracy of numerical calculation is higher. The distribution of the radial force under three different flow conditions shows a certain periodicity. That is to say, the transient radial force is the most unstable at the small flow rate, the regularity of the transient radial force is the strongest under the rated condition, and the fluctuation of the transient radial force is the smallest under the large flow condition. Under different flow conditions, the blade passing frequency always plays the leading role. Under the rated flow condition, the low-frequency signal is the main cause of the pressure pulse. The change of flow rate has little influence on the pressure coefficient amplitude at the inlet and the outlet of the impeller, while it has great influence on the pressure coefficient amplitude at the middle of the impeller. The results provide a theoretical basis for revealing the unsteady flow characteristics and the induced deterioration of rotor faults in the mixed flow pump.
2019 Vol. 37 (4): 277-283 [Abstract] ( 270 ) [HTML 1KB] [ PDF 7903KB] ( 179 )
284 Influence of impeller diameter on mixed flow pump as turbine
BAI Yuxing,*,LIU Yingying,KONG Fanyu,XIA Bin,DAI Tao
In order to research the performance and concentration of the impeller diameter of mixed flow pump as turbine, a mixed flow pump was set as a model. First, the CFD method was verified by using the experiment. Then, three different impeller diameters of 160,170 and 180 mm were built through BladeGen. Finally, the numerical simulation is used to make an analysis of hydraulic characteristics, loss distribution and internal flow field distribution under these three different impeller diameters. The results show that with the increase of impeller diameter, the high efficiency point moves gradually to the large flow area, and the corresponding head, shaft power and efficiency of the high efficiency point increase. In the large flow area, the head decreases rapidly, the shaft power decreases and the efficiency increases, while the total hydraulic loss and the hydraulic loss of the impeller part decrease significantly; the hydraulic loss change in the volute part is not obvious; the vortex area of the impeller inlet gradually decreases; the gap fluid between the volute and impeller entrance gradually decrease, which causes the hydraulic loss in the part decreases gradually.
2019 Vol. 37 (4): 284-288 [Abstract] ( 220 ) [HTML 1KB] [ PDF 5849KB] ( 196 )
289 Parameters optimization of ear-type floating sleeve in external spur-gear pump
GUO Jiadong*, JIANG Jin, SUN Qiangqiang, LIU Cheng, LIU Laiquan
To reduce the friction among the main gears, driven gears and their end face floating sleeve in external spur-gear pumps, thus enhance the volume efficiency and fatigue life, the mechanism of end wear of gear pump was analyzed firstly, and it was concluded that the unbalance of force and moment of the floating sleeve was the cause of wear. The expression of outboard force and moment were deduced. Based on genetic algorithm, the resultant and resultant moment of the ear-type floating sleeve were taken as objective functions. And the outer diameter, inner diameter, angle and elastic strength of the seal ring on floating sleeve were taken as independent variables. Under the restrained conditions of moment balance and width of seal ring, the values of the independent variables were obtained when the objective function was minimum. At last, numerical simulation was carried out on external spur-gear pump with non-optimized and ear-type floating sleeve. The numerical simulation of gear pump with optimized floating sleeve shows that the resultant force of the floating sleeve is almost zero. Then the rationality of the optimum design of the floating sleeve is verified. The research can provide technical reference for gear pump sealing design.
2019 Vol. 37 (4): 289-295 [Abstract] ( 213 ) [HTML 1KB] [ PDF 2431KB] ( 166 )
296 Heat flow coupling of the cooling circulation loop on the canned-motor pump
ZHOU Yisong*,KONG Fanyu,CAO Ruijia,SUN Jingru
To investigate the relationship between cooling circulation loop of cannedpumps and the internal temperature rising, the distribution of temperature field and pressure field in the canned motor and the temperature rise in the cooling circulation loop were simulated and the convective heat transfer information between the coolant and the rotor was analyzed.The thermal-fluid coupling numerical analysis of the whole flow field of the impeller, the chamber and the cooling circulation circuit of the canned pump was carried out by using the engineering simulation software CFD based on the real prototype of the stampingwelding cannedmotor pump. The results show that under different working conditions, the temperature rise in the shielding gap is very small, the maximum temperature difference is only 0.97 ℃. Under the design condition, the different shaft aperture has little effect on the temperature rise of the cannedmotor. With the increase of axial aperture, the maximum temperature of cannedmotor is decreasing. Under the design condition, the relationship between cooling cycle flow and axial aperture is compared with the numerical calculation and theoretical calculation.It is concluded that the results of numerical calculation and theoretical calculation are basically the same, which provides a theoretical basis for the design of cooling cycle circuit of cannedpump.
2019 Vol. 37 (4): 296-301 [Abstract] ( 235 ) [HTML 1KB] [ PDF 3191KB] ( 194 )
302 Flow-induced noise and noise reduction of self-priming vortex pump
YU Haoqian*,WANG Yang,HAN Yawen,HU Rixin,TANG Haitao,WANG Qun
A research on the internal sound field characteristics was conducted in order to reduce the running noise of self-priming vortex pump. The CFX software and Acoustic Harmonic BEM of LMS Virtual Lab software were combined to study the internal pressure pulsation and the noise generated. Firstly, the pressure fluctuations of self-priming vortex at 0.4 Qd, 0.6 Qd and Qd were obtained from the unsteady simulations with RNG k-ε turbulence model in the CFX software. Secondly, pressure fluctuations data were extracted and input into the LMS Virtual Lab software. Finally, the SPL of the pump discharge and the internal sound pressure distributions at different flows were obtained by acoustic field calculations. From the analysis of the CFD results and acoustic field calculations, it is concluded that the rotor-tongue interaction is the main cause of the noise. Results from the sawtooth structures on the trailing edge of turbine blade for reducing pressure pulsation, the CFD and acoustic field calculations show that the maximum amplitude of pressure pulsation decreases, by 20.0 % and 26.6 % respectively at Qd and low-flow rate. The SPL at Qd, decreases by 1.01 dB and 1.03 dB respectively in the inlet and outlet pipes. The SPL at low-flow rate, decreases by 8.57 dB and 2.65 dB respectively in the inlet and outlet pipes.
2019 Vol. 37 (4): 302-306 [Abstract] ( 243 ) [HTML 1KB] [ PDF 2160KB] ( 170 )
307 Numerical simulation of high-pressure pump with CFD
LIU Kun,XU Lei*,YANG Bo,LIU Yun
In order to study the influence of flow pulsation coefficient on the internal flow field of external helical gear high-pressure pump, the influence of the helix angle on the flow pulsation coefficient is analyzed by the theoretical formula. Combined with computational fluid dynamics(CFD),the numerical experiment of the flow field in the external gear helical gear was carried out, and the influe-nce of different speeds and radial clearances on the pressure pulsation and flow characteristics was ana-lyzed.The results show that the larger helix angle will reduce the flow pulsation coefficient, it is good for improving the quality of the outlet flow and reducing the gear pump leakage. Furthermore, when the speed and radial clearance increase within a certain range, the pulsation coefficient decreases and the leakage vortex intensity also decreases. When the rotational speed and radial clearance continue to increase, the pulsation coefficient tends to be stable.When the rotational speed increases, the pressure in the meshing area varies greatly, but the gear pressure near the pump wall changes little. On the other hand,when the radial clearance increases, the leakage flow and leakage vortex intensity will be reduced, the quality of outlet flow will also improved by increasing the speed and radial clearance. The study of the motion law and flow pulsation characteristics of the internal flow field of the high-pressure pump is of some reference value to the design and optimization of the external helical gear.
2019 Vol. 37 (4): 307-312 [Abstract] ( 231 ) [HTML 1KB] [ PDF 2350KB] ( 172 )
313 Numerical simulation of flow-induced vibration of double-suction centrifugal pump as turbine
LUO Bo,WANG Chunlin*,XIA Yong,YE Jian,YANG Xiaoyong
A double suction centrifugal pump was chosen to the research objective to analyze the unsteady pressure fluctuations. Based on the finite element method, the forced vibration response calculations were completed based on the modal of the pump case for the different fluid pressures on the internal face, when the double suction pump running as a turbine and running as a pump. It was found that the interaction between the impeller and the tongue caused the unsteady characteristics near the tongue. In addition, the pressure fluctuation was mainly affected by the low frequency wave,and the response velocity was concentrated in the frequency of rotation, blade passing frequency and harmonic frequency due to impeller rotation and pressure fluctuation characteristics. As the third frequency 880083 Hz and the frequency of 3 BPF 884.991 Hz was close, which caused the resonance phenomenon. It reveals the change rule of the response velocity of the vibration of the pump case and provides the reference for the further research of reduction of vibration and noise.
2019 Vol. 37 (4): 313-318 [Abstract] ( 170 ) [HTML 1KB] [ PDF 3403KB] ( 163 )
319 Numerical study on dynamic characteristics of flow around a vanes in the channel based on overset meshes
HUANG Jianfeng*,YANG Song,LONG Liyan,ZHANG Lixiang
Numerical simulation of turbulent flow around a vane in the channel with guide vane closure based on the two-dimensional transient N-S equation was conducted with the standard k-ε turbulence model. In order to study the dynamic effect of the cascade flow field on the fluid-structure interaction occurring between the flow and guide vanes in the transient process of hydro-turbine, the overset meshes and dynamic mesh technology were used in such an unsteady flow problem. The dynamic characteristics of non-uniform flow field show strong nonlinearity under the two methods. The lift and drag coefficients of a guide vane are in good agreement with time. The pressure, vortex structure and turbulence intensity distribution in the channel at the typical time are basically the same. But the mesh number of the overset mesh is about 1/3 of the dynamic mesh, and the computation time is about 1/4 of the dynamic mesh. It is shown that the overset mesh method has better advantages than the dynamic mesh method in terms of computational efficiency. The results show that the two methods can well simulate the dynamic flow around a guide vane. But for some complicated nonlinear dynamic boundary fluid-structure interaction problems, the overset mesh method is preferred. The two methods are of higher engineering application value.
2019 Vol. 37 (4): 319-324 [Abstract] ( 266 ) [HTML 1KB] [ PDF 1708KB] ( 226 )
325 Experiment of hydraulic scouring characteristics of thin water in Pisha-sandstone
CHANG Ping,LI Xiaoli*,LI Mingyu,CHEN Suhang,WU Shangyun
Using the indoor sink that can adjust the slope and selecting the five slopes(5?,10?,15?,25?,35?)and five flows(280,420,550,650,900 L/h), we simulated the indoor thin water flow scouring test. The results show that when the slope is constant, the erosion rate increases with the flow rate, and the growth rate is affected by the slope. There is a critical slope value between 15? and 35?. In the absence of rainfall, at less than the critical slope, the erosion rate and energy slope between meet the polynomial relationship. During the erosion, the flow of the thin layer of the slope belongs to the rapid current in the laminar flow. The generation of the erosion rill is related to Fr and Re. When the slope is less than 10?, the shear stress and the flow power are not affected by the flow rate. When the flow rate is less than 420 L/h, the slope effect is not particularly obvious. The effect of the slope on the flow rate is greater than that of the flow, resulting in the fact that the slope has a greater impact on the unit water flow. The effect of single width flow and energy slope on the erosion rate is large. And the fitting model of erosion rate is established. This model can meet the large angle scouring of Pisha-sandstone.
2019 Vol. 37 (4): 325-331 [Abstract] ( 179 ) [HTML 1KB] [ PDF 5663KB] ( 150 )
332 Noise reduction mechanism and optimization analysis of axial flow fan
CHEN Huilong,CHEN Miaomiao*,FU Jie,HUANG Yougen,SUN Dongdong,WU Yuanzheng,ZHANG Peilin
To reduce the noise of the axial fan and improve its aerodynamic performance, the causes of the noise and the mechanism of noise reduction in the internal flow field were studied. Three approaches were proposed to optimize the design of the blade trailing edge. All the approaches were carried out via modeling and simulation of an axial fan blade. The diagnostic method of boundary vorticity flux (BVF) was used to analyze the results of the simulation, which were verified by experiments. The results show that the diagnostic method of BVF can be used in analyzing the cause of the eddy. It is an efficient way to investigate the mechanism of the internal flow based on the variation of the eddy and the distribution of the internal flow field. The eddy in the blade trailing edge is the main reason of the noise, and the serrated trailing edge approach, which can reduce the eddy in the blade trailing edge, can significantly reduce the noise. In addition, a reference structure of the trailing edge is proposed, which can make a contribution in the reduction of the aerodynamic noise.
2019 Vol. 37 (4): 332-335 [Abstract] ( 308 ) [HTML 1KB] [ PDF 7349KB] ( 189 )
336 Influence of pitch angle on aerodynamic characteristics of propeller
BIAN Ruopeng, ZAN Binghe, ZHU Jianyong*, HE Miao
In order to study the cross wind effect on the influence of pitch angle on the overall aerodynamic performance of propeller, CFD software was used to solve N-S equation of unsteady incompressi-ble flow and S-A turbulence model, based on sliding mesh technology and dynamic mesh technology. The aerodynamic characteristics of propeller under static change and dynamic change of pitch angles were numerically simulated, respectively. The static pitch angles were 0?, 3癮nd 6?. The dynamic change of pitch angle indicates pitch angle sinusoidally varied from 0皌o 4?. The numerical results indicates that in the static process, the tension and torque increase linearly with pitch angle, while the efficiency decreases. Compared to the case of pitch angle of 0?, the tension increases by 20%-30% and the torque increases by 30%-40% for pitch angle of 3?. In the dynamic process, the tension, torque and power increase linearly with pitch angle, while the efficiency decreases. Moreover, the aerodynamic parameters at pitch angle of 3癷n the static process approximately equals that at the same pitch angle of 3癷n the dynamic process, where pitch angle increases form 0皌o 4?
2019 Vol. 37 (4): 336-340 [Abstract] ( 330 ) [HTML 1KB] [ PDF 2351KB] ( 153 )
341 Influence of feeding method on feed quantity of screw feeder
SHI Yunfei, ZHANG Xiliang*, XU Yunfeng, CUI Shoujuan
In order to study the influence of feeding mode on the performance of single screw feeding, based on screw feeding theory and using EDEM software, a screw feeding model with discharging device was established. The screw feeding process of soybean particles with 5.5 mm diameter was simulated under 60 r/min and 120 r/min, respectively. The total energy loss in the screw feeder at the two speeds and the difference of the feeding quantity were compared, and the trajectory of the particle group movement was analyzed. Numerical analysis shows that the mechanism has low initial energy consumption, small feeding fluctuation and less relative action between particles in dynamic feeding mode. Meanwhile, the mechanism has high initial energy consumption, big feeding fluctuation and more relative action between particles in static feeding mode. The research provides theoretical and numerical simulation basis for the feed mode of screw feeder.
2019 Vol. 37 (4): 341-345 [Abstract] ( 561 ) [HTML 1KB] [ PDF 5539KB] ( 163 )
346 Effects of different fruit number and distance between sink and source on dry matter partitioning of greenhouse tomato
NI Jiheng*, LIU Yong, MAO Hanping, ZHANG Xiaodong
In order to explore the effect of sink/source ratio and distance between sink and source, a study was conducted at Venlo type experimental greenhouse of Jiangsu University from January to December 2016. Experiment was divided into the autumn-winter season and early spring of crop stubble with double stem pruning. Treatments were three left fruit levels(T1 left 3 fruit; T2 left 2 fruit; T3 left 1 fruit)and two distance between sink and source(T4, left 1 fruit of the first branch; T5, left 1 truss of the second branch). The established mathematical formula of leaf length and leaf dry weight, stem height and weight, and fruit diameter and fruit dry weight were adopted to calculate the dynamic changes of various organs. The result showed that dry matter productions between T1, T2 and T3 had no significant differences, but were higher than those of T4 and T5. Partitioning coefficient of T1 was significantly higher than that of T2 and T3 after 22 days treatment. And partitioning coefficient of T4 was significantly higher than that of T5 after 16 days treatment. The results showed that the sink/source ratio and distance between sink and source could affect dry matter partitioning, which should provide a theoretical basis for pruning management of greenhouse tomato.
2019 Vol. 37 (4): 346-351 [Abstract] ( 186 ) [HTML 1KB] [ PDF 1974KB] ( 181 )
352 Three-dimensional Green-Ampt infiltration model of muddy water with different sediment concentration under film hole irrigation
CHEN Lin, FEI Liangjun*, JIN Shijie, WANG Zilu, ZHONG Yun
The indoor muddy water film hole infiltration test was made and based on the threedimensional Green-Ampt model to establish the relevant physical model to study influence of sediment concentration on free infiltration under muddy water film hole irrigation. The effect of sediment concentration on free infiltration under muddy water film hole irrigation was generalized as infiltration reduction force on the water and soil interface settlement layer. And based on film hole irrigation with clear water, the changing law of the infiltration reduction force on the water and soil interface settlement layer with time was obtained. The results showed that the infiltration reduction force increased with sediment concentration increment. The higher the sediment concentration was, the more obvious the effect about infiltration reduction force was. There was a good power function relationship between the same sediment concentration and the time. The maximum value of reduction force appeared at the initial stage of infiltration. In the first 30 minutes, the reduction force was significantly higher. After 30 minutes, the change trend of reduction force decreased gradually. After 100 minutes, the change trend of reduction force became the steady state. These results lay the foundation for the subsequent study on the free infiltration of muddy film hole irrigation, and are of important scientific value to the development and practical application of irrigation theory.
2019 Vol. 37 (4): 352-357 [Abstract] ( 246 ) [HTML 1KB] [ PDF 1111KB] ( 181 )
358 Effects of shell material characteristics on hydraulic performance of bubbled-root emitter
CHEN Rui,ZHU Delan,*,WU Shoujun,ZHANG Lin,
The hydraulic performance of emitters with different shell materials should be investigated. The bubbled-root emitters made by 5 kinds of shell materials(ABS, HDPE, HDPE+20%EVA, LDPE+20%EVA, 40%HDPE+40%LDPE+10%LLDPE+10%EVA)were selected. The effects of shell material characteristics, such as shrinkage, modulus and tensile deformation on hydraulic performance were tested. The results showed that the effects of shell materials physical properties on emitter out-flow were significant. The larger the molding shrinkage of the shell material is, the closer the inner diameter of emitter shell is. Thus, the labyrinth channel fitted more closely to the shell, which led to a decrease of emitter flow rate. The shell material with better rigidity had stronger ability to resist the external deformation. Consequently, emitter flow rate was more stable as the pressure head increased. The emitter shell with better nature rebound resilience had lower manufacturing variation under the same manufacturing process. Therefore, in order to obtain a bubbled-root emitter with better hydraulic performance, the selection of emitter shell material should balance the rigidity and nature rebound resilien-ce. In this study, the most appropriate material for bubbled-root emitter shell is 40%HDPE+40%LDPE+10%LLDPE+10%EVA.
2019 Vol. 37 (4): 358-362 [Abstract] ( 261 ) [HTML 1KB] [ PDF 2588KB] ( 140 )
363 A new type thermal insulation cabinet of outdoor frequency conversion controller
LI Liang,HOU Shiwen*,WANG Xingtian,LIU Wenbin,WANG Shifeng
Through the analysis of the principle, technology and structure of the insulation cabinet, the design of the insulation cabinet of the outdoor frequency conversion controller is completed, which solves the problem that the frequency conversion controller of the wind and solar water pumping equipment is easy to freeze in winter. In the development of a new type outdoor frequency conversion controller insulation cabinet, its thermal insulation effect is analyzed by means of model simulation and test verification, and the experimental analysis is made. The results show that the linear model of the length of self-limiting temperature tracing tropical zone and the ambient temperature is L=-0.062T+0.65, and the standard deviation is 0.804, and the precision is high. The ideal heating mode of the insulation cabinet is determined to be the length of the self-limiting temperature tracing tropical zone of 2.2 m and the heating time of 25 minutes. The analysis shows that the self-limiting temperature tracing tropical zone used in the insulation cabinet can effectively improve the temperature inside the cabinet and ensure the normal opening and closing of the controller, which has better practical application effect. As a result, it is of great significance to improve the water-supply guarantee rate of wind energy and solar energy water-supply equipment in winter in high, cold and remote areas.
2019 Vol. 37 (4): 363-368 [Abstract] ( 168 ) [HTML 1KB] [ PDF 1562KB] ( 119 )
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