[an error occurred while processing this directive]
排灌机械工程学报
   Home  About Journal  Editorial Board  Instructions for Authors    中文 
 
　

Office Online

 　
　  Author Center
　  Peer Review
　  Editor Work
　  Office Work
　  Editor-in-chief
　

Journal Online

 　
　  Forthcoming Articles
　  Current Issue
　  Next Issue
　  Archive
　  Read Articles
　  Download Articles
　  Email Alert
　  
Quick Search  
  Advanced Search
Journal of Drainage and Irrigation Machinery Engin
 
2017 Vol.35 Issue.12
Published 2017-12-25
article
article
1001
2017 Vol. 35 (12): 1001- [Abstract] ( 278 ) [HTML 1KB] [ PDF 2655KB] ( 552 )
1002
2017 Vol. 35 (12): 1002- [Abstract] ( 382 ) [HTML 1KB] [ PDF 1231KB] ( 767 )
1013 Characteristics and influence of cavitation bubble induced by nanosecond pulsed laser
TONG Yanqun,, HUANG Jianyu, WU Xiaoyi, YUAN Shouqi, Ren Xudong,
Cavitation corrosion of hydraulic machinery is complicated. Surface corrosion resistance technology is hard to achieve. A well controllable nanosecond pulsed laser was used to induce cavitation. The feature images of plasma cavity, cavitation shock wave and bubble pulsation were acquired by a highspeed camera. The influence of laser parameters on the cavitation characteristics such as bubble size and fluctuation time was analyzed. Combined with acoustic signals collected by hydrophone. The pressure of shock wave was analyzed. The residual stress in the laser action region was measured to characterize the surface properties of the material. The relationship between laser parameters and surface properties was analyzed. The experimental results show that the semicircular plasma cavity is generated by the optical breakdown effect. The larger the laser energy is, the longer the period of cavitation bubble pulsation is, and the larger the size of the cavitation bubble is. Shock wave images are clearly acquired when the laser bubble rebounds. The shock wave pressure is almost linearly related to the laser energy. The residual compressive stress is close to the original value under the small energy laser. Under the influence of large energy laser, the residual compressive stress increases rapidly. Residual compressive stress is almost linearly related to the laser energy, and the force is stable. These results provide a reference for research on the cavitation erosion mechanism and control countermeasures.
2017 Vol. 35 (12): 1013-1017 [Abstract] ( 979 ) [HTML 1KB] [ PDF 1659KB] ( 1246 )
1018 Effect of particle size on flow in stator and rotor cascades of guide vane type centrifugal pump
LI Rennian,, CHEN Hao, HAN Wei,, LI Xuefeng, LIU Huijuan
In order to study the effect of particle size on the evolution of solid-liquid two-phase vortex structure, the vane type centrifugal pump is taken as the research object. Using the ICEM software on the research object of hexahedral mesh generation, the Mixture model and the large eddy simulation(LES)is used to simulate the whole flow field of the vane type centrifugal pump. The effects of particle size on the evolution of vorticity and the pressure pulsation in the impeller-guide vanes were analyzed and compared with those of 0.1, 0.2 and 0.3 mm. The results show that with the particle size increasing, the overall particle volume fraction in the impeller region decreases, and particle size distribution is more nonuniform. In the guide vane region, with the increase of the particle size, in back of the guide vane appeared an obvious particle aggregation area. Owing to the different force on the particles in impeller and guide vane, with the increase of the particle size, the pressure of the guide vane decreases, but the pressure in the impeller region is not obvious. Because of the rotor-stator interaction between the impeller and the guide blade, the action on the particles in the impeller and guide blade is not the same, especially at the joint of the impeller and guide vane, pressure fluctuation is very unstable.
2017 Vol. 35 (12): 1018-1023 [Abstract] ( 620 ) [HTML 1KB] [ PDF 3118KB] ( 834 )
1024 Unsteady dynamics in double channel pump
Tan Minggao, Lian Yichao, Wu Xianfang, Ding Rong, Chen Kun
In order to research the unsteady dynamics in a double channel sewage pump as it transports the solid-liquid two-phase flow, the inner flow double channel sewage pump was numerically simulated by using the mixture multiphase flow model and the developed standard k-ε turbulence model. The pressure fluctuation in the gap flow channel and the impeller radial force under different impeller diameter D2, namely 101, 103 and 105 mm, were studied. The simulation results agree well with the experimental ones, which indicated that the numerical calculation methods can be used to predict the transient dynamics in this pump. The results showed that the dominant frequency of pressure pulsation at monitoring points in gap flow channel is the blade passing frequency before and after adding a moderate amount of particles. The pressure fluctuation intensity at each monitoring point was weakened with particle addition and the maximum reduction was 25.86%. When the pump transports the solid-liquid two-phase flow and the diameter is 105 mm or 101 mm, the distribution and change of impeller radial force are more regular under designed and operation at a small flow rate. When the flow rate of two-phase flow is larger than the design flow rate, the distribution and change of impeller radial force are regular under all diameters. As the flow rate of two-phase flow increases, the vector center of impeller radial force moves from the eighth section to the fourth section of volute and the impeller diameter has little effect on it.
2017 Vol. 35 (12): 1024-1029 [Abstract] ( 627 ) [HTML 1KB] [ PDF 3141KB] ( 799 )
1030 Quasi 3-D design and numerical simulation of high specific speed volute mixed-flow pump
YANG Jingjiang, YAO Dengjie, XIANG Qingjiang, LIU Chengqiang
In the light of little research work on high specific speed volute mixed-flow pumps, we applied the design method of combining non-viscous three-dimensional inverse design method with viscous three-dimensional direct problem to a volute mixed-flow pump with specific speed 603. Based on quasi three-dimensional pump design theory, we investigate the validity of three-dimensional hydraulic design method in developing the high specific speed volute mixed-flow pumps. During the three-dimensional inverse design, first a mixed-flow pump as the initial computational model was obtained by using two-dimensional hydraulic design technique, then the S-shaped velocity moment distribution along meridional streamlines was specified, finally a new volute mixed-flow pump was generated. To solve three-dimensional steady Reynolds averaged N-S equations, CFD software CFX, standard k-ε turbulence model and SIMPLE algorithm were used. The computations of the newly designed pump under three operating conditions including design condition, low flow rate and large flow rate conditions were performed to analyze its hydraulic performance. The numerical simulation results show that the newly designed pump has regular streamlines in impeller and volute flow passages, and the static pressure distribution in pressure side and suction side of the impeller is even and reasonable. The velocity moment distribution in the vicinity of impeller tip and hub from leading edge to trailing edge is nearly the same as S shape. Under the design operating condition the newly designed pump′s efficiency is higher than the initial pump′s, which is designed in the method of flow speed coefficients. The newly designed pump has fulfilled the requirement of hydraulic performance for high specific speed volute mixed-flow pump.
2017 Vol. 35 (12): 1030-1035 [Abstract] ( 554 ) [HTML 1KB] [ PDF 1748KB] ( 804 )
1036 Design and analysis of high-speed fire pumps
YANG Xiuxin, SONG Wenwu, WEI Lichao, SHI Jianwei, WANG Xin
In order to fix the drawbacks of large-size and low heads of the existing vehicle-mounted high-speed fire pumps, an advanced new pump,based on increasing flow method in combination with minimal power required additional inducers and enlarged throat area of volutes, is playing significant roles in firefighting of high or superhigh-storey buildings. Meanwhile, it was modeled through employing UG, and the turbulent numerical simulation of 3D steady flow on hydraulic model of the pump was carried out based on RNG k-ε turbulence model through Ansys. The calculated results show that performance curves of the pump are featured by stability, high efficiency, and wide high-performance area. Moreover, it is unlikely for the pump to have overloading situations. The head is 71.3% of rated head at the design flow of 150% and the head of shut off condition is 126.7% of rated head. The stationary flow rules of its inducers, impellers and volutes were analyzed through velocity vectors and sta-tic pressure. The results show the even distribution in velocity pattern and the sound arrangement between blades of inducers and impellers. Owning to the stability of the interior of the new pump, indu-cers can effectively improve their cavitation and erosion resistance. Consequently, this kind of pumps can meet standard requirements of fire pumps.
2017 Vol. 35 (12): 1036-1041 [Abstract] ( 563 ) [HTML 1KB] [ PDF 1654KB] ( 942 )
1042 Effect of outlet back pressure on performance of twin-screw pump as turbine
JIANG Xiaoping, LIU Sihan, WANG Yang, WU Jiahui, LI Wei, ZHU Jiawei
There is little study on screw pump as turbine even though the pump potentially can be applied in process industry, especially in liquid-gas two-phase flow conditions. On account of this serious shortage of research in this field, fluid dynamics in a twin-screw pump with the commonly used A-type tooth profile and specific geometrical parameters was simulated by employing moving mesh technique in a CFD code-Pumplinx when the pump working as turbine. Firstly, the mesh was generated, and then a mesh size independency analysis was conducted to get the optimal meshing scheme; finally, the characteristics of the pump as turbine were obtained and compared between various outlet back sta-tic pressures. The results showed that the fluid static pressure in the turbine always kept being a step shape from the inlet to the outlet of the screws due to the influence of meshing line, but also the fluid static pressures in the sealing chambers were in the same level as those in the screws. The interlobe clearance and radial gap between the casing and the screw tip were two chief factors affecting the efficiency of the turbine, especially with the increase of outlet back pressure, the leakage flow rate and velocity decreased, resulting in an increased efficiency. Meanwhile, the torque and axial thrust on the screws were affected significantly and directly by the back pressure, particularly, they decreased linea-rly with increasing back pressure. However, compared with the follower screw, the main screw could produce a more torque and withstand a larger axial thrust.
2017 Vol. 35 (12): 1042-1047 [Abstract] ( 807 ) [HTML 1KB] [ PDF 3875KB] ( 1007 )
1048 Design vacuum degree adjustable device based on fuzzy control in dredged sludge treatment
FENG Xusong,, XIANG Qingjiang, JI Feng,, LUO Yin
Based on frequency control of motor speed method, the jet intensity at the nozzle of jet pump was changed, and so was the vacuum degree of the device, then vacuum adjustable can be rea-lized. In this paper, MSP430F149 microcontroller was designed as base module of control system, fuzzy control was adopted to change the motor speed of centrifugal pump, vacuum adjustable test was carried out on the test rig. The test results show that the vacuum degree increased with the increasing of centrifugal pump motor speed, or increased with the flow rate of working water. For the jet vacuum device, the range of vacuum can be adjusted from 0 to 92 kPa, the control accuracy of vacuum value is less than 5 kPa, and the time to reach the set value and become the steady state is less than 25 se-conds. Fuzzy control method has the strong adaptive characteristics, and stable and reliable vacuum control can be achieved for the jet vacuum device. Compared with the valve opening method to change the device vacuum degree, frequency control of motor speed has the virtue of energy saving. The vacuum adjustable characteristic can be applicated in other vacuums such as the well-point dewatering.
2017 Vol. 35 (12): 1048-1053 [Abstract] ( 775 ) [HTML 1KB] [ PDF 1588KB] ( 854 )
1054 Axis Orbit Automatic Identification On Time-Series Similarity Mining for Hydropower Units
Axis orbit is a kind of important graphic signs to judge whether the rotor is running normally or not, and it is an important target of the condition monitoring of rotating machinery. The operation state of the equipment can be expressed directly and vividly. A new method for intelligent diagnosis of shaft orbit of hydro generator set is presented. This method according to the characteristics of the hydroelectric generating unit, the application of the fuzzy distance measure between features with recent time series, the application of improved intelligent diagnosis on time sequence characteristics of SVM, improve the diagnostic level of automatic fault diagnosis system and accuracy.
2017 Vol. 35 (12): 1054-1057 [Abstract] ( 670 ) [HTML 1KB] [ PDF 1437KB] ( 907 )
1058 Flow pattern of shunt heat meters
ZHAO Guangxia,, XU Kun, CHEN Fengming
In the light of a new type shunt heat meter structure model, by the using the of relevant theo-retical knowledge and the RNG fluid turbulent model, we established the mathematical model of different eccentric angles and opening sizes of the eccentric flow.By using fluent simulation software, We analyzed the shunt structure of the shunt heat meter and internal fluid motion characteristics.For the simulated flow channel model, by using the computational fluid dynamics method,we numerically si-mulated and analyzed different channel width flow field after flow passage structure optimization. The simulation results show the turbulence characteristics of flow in the headbox flow field, and analysis shows that the deflector with triangular pillar bumps has good effect on enhancing the turbulence intensity in the grooves of headbox. By optimizing the opening and eccentric angle of the flow channel, the paper provides a theoretical basis for the measurement accuracy of the shunt heat meter.
2017 Vol. 35 (12): 1058-1062 [Abstract] ( 624 ) [HTML 1KB] [ PDF 1841KB] ( 948 )
1063 Influence of structure parameters of high-pressure jet nozzle on cavitation
WANG Peng, WANG Zhong, QU Lei
Cavitation phenomenon of the hole with instability, the generation of a hole and collapse induce the disturbance of fluid flow in the high-pressure spray hole, diesel injector nozzle hole Shigao pressure jet orifice of the typical form. By using the ANSYS software of fluent module, we simulate diesel injector under the different conditions of injection pressure, spray holes with different inlet rounded radii, diameter ratio inside the nozzle fuel hole shape, and we analyze the influence of the nozzle structure parameters on the fuel mass flow in the presence of cavitation. The results show that in certain circumstances, the injection pressure can be increased by increasing the inlet radius and changing the medium-diameter ratio as d/D<1.0 or d/D>1.1, which can inhibit the cavitation, and 1.0<d/D<1.1 can promote the cavitation. Increasing the inlet radius and the radius ratio of the nozzle can increase the mass flow rate of the fuel in the injection hole, and the effect is more obvious when the injection pressure is higher.
2017 Vol. 35 (12): 1063-1068 [Abstract] ( 823 ) [HTML 1KB] [ PDF 2246KB] ( 1156 )
1069 Effects of water deficit on physiological characteristics at seedling stage of maize
WU Lifeng,, YANG Xiuxia, YAN Hui
In order to reveal the effect of water deficit on physiological characteristics of maize, variations of its photosynthesis and fluorescence, physical damage and protection mechanism at the seedling stage under water deficit were analyzed. The results show that stomatal closure induced by leaf ABA accumulation could decrease photosynthesis and fluorescence, but water use efficiency was increased under mild and moderate water deficit. The maximum photochemical efficiency of PSII was not affected under mild water deficit, which suggested that oxidative damage was avoided by dissipation of excess excitation energy. However, under moderate and severe water deficit, the protective mechanism was not sufficient for avoiding photo-damage. Thus, the damage to PSII occured. In addition, water deficit could also induce reactive oxygen species accumulation. Under mild water deficit, the activity of enzymatic antioxidants was increased and non-enzymatic antioxidative compounds were accumulated for alleviating physiological damages. However, the antioxidant activities of enzyme and non-enzymatic system were exceeded by reactive oxygen species accumulation. Thus, the level of membrane lipid peroxidation was increased. It is provided theoretical guidance for optimizing water use in maize according to its physiological characteristics.
2017 Vol. 35 (12): 1069-1074 [Abstract] ( 781 ) [HTML 1KB] [ PDF 1647KB] ( 856 )
1075 Design and application of pre-warning system for farmland waterlogging
JIAYanhui,, FEI Liangjun, HUANG Xiuqiao, FAN Yongshen,, LI Jinshan,, MA Chunya
In order to improve the water management in the farmland and reduce the influence of waterlogging damage on crops, the intelligent warning system for farmland waterlogging was designed based on the real time monitoring of water information in crop root areas. The system is composed of 6 parts: water information sensor, data acquisition and wireless transmission module, data processing module, farmland damage prediction and disaster release module, which can continuously monitor farmland water accumulation and soil moisture status, and transfers the data through the wireless transmission system, then evaluates and forecast the waterlogging. Based on the field experiments, parameters in the mathematical model are determined, and a method for evaluating and predicting farmland waterlogging damage is proposed. Result of application indicates that the real time monitoring results and warning accuracy can meet the demand of farmland water management, and moreover the monitoring module of this system is small and portable, and the software module has friendly interfaces and simple operations. Applicating this system has the striking effect on improving the drainage management level and reducing the damage of farmland waterlogging.
2017 Vol. 35 (12): 1075-1080 [Abstract] ( 714 ) [HTML 1KB] [ PDF 1812KB] ( 752 )
1081 Influence of soil bulk density on soil water infiltration characteristics in water vertical movement for red loams
ZENG Jian, FEI Liangjun, PEI Qingbao,
In order to analyze the effect of soil bulk density on soil water infiltration in red loam areas and to apply it to irrigation production, the Jiangxi red loam was taken as the study object. The experiment utilized the one-dimensional water vertical infiltration to simulate how soil bulk density influences the water in red loam. The results show that the wetting front and cumulative infiltration volume and infiltration rate at the same time decreased with soil bulk density increasing. Time had more significant effects on the wetting front migration and accumulative infiltration capacity than the bulk density, and the linear relationship between wetting frag and cumulative infiltration was established. Bulk density had great effect on infiltration in the initial time of infiltration, then the effect gradually weakened in the process of infiltration. Saturated hydraulic conductivity and soil bulk density showed a negative power function relationship. In Green-Ampt model and Philip model, the relative error of saturated hydraulic conductivity is less than 9.62% and the calculation accuracy of the two models is higher when the soil bulk density is more than 1.30 g/cm3. During the redistribution period, the water content at the same soil depth decreases with soil bulk density increasing. The soil water content decreases with the increase of redistribution at the soil depth of 0-50 cm, and the soil bulk density has a significant effect on water content(P<0.05), the soil bulk density has not a significant effect on water content at the soil depth of 50-70 cm. The results provide the theoretical support for crops irrigation in red loam areas.
2017 Vol. 35 (12): 1081-1087 [Abstract] ( 581 ) [HTML 1KB] [ PDF 1681KB] ( 882 )
1088 Control strategy for precision water-fertilizer irrigation system and its verification
ZHANG Yubin,, WEI Zhengying, ZHU Xinguo, HU Yang, LI Linzhang
For the precise control problems of water and fertilizer solution concentration in the process of agricultural irrigation, the precise irrigation control system was developed based on PID control technology, the application of conductivity EC value and pH value control technology. We performed open-loop step response experiments and relay oscillation adjust experiments. The results showed that the system is nonlinear, inertial, and hysteretic. We also performed theoretical and experimental study on digital PID control for EC control. The results indicated that the PID controller has the advantage of high control accuracy, and some time has the disadvantage of performing badly when the fertilizer solubility changed considerably. Adopting open-loop step response theory, PID control and fuzzy control, we designed the intelligent PID controller. The results showed that the controller is auto-tuning of PID parameters, the settling time is 3 minutes, accuracy is within ±0.15 mS/cm, and overshoot less than 15%. With the combination of open-loop step control and PID control, we designed an alternative PID controller for pH, and experiments proved that it has some fine performance as mentioned above.
2017 Vol. 35 (12): 1088-1095 [Abstract] ( 683 ) [HTML 1KB] [ PDF 1894KB] ( 2007 )
1096 Design and analysis of novel double-winding bearingless flux-switching permanent magnet machine
SUN Yuxin, WU Haoyang,SHI Kai, TANG Jingwei, SHEN Qikang
Conventional bearingless permanent magnet machines usually suffer from the mechanical integrity and thermal problems since PMs are located in the rotor. In order to overcome this problem, a novel bearingless flux-switching permanent magnet(FSPM)machine(BFSPM)is proposed. Both of the windings and PMs are housed in the stator and the rotor is composed of a simple iron core with sa-lient teeth, which is suitable for some applications the rotor is disposable in medical blood pumps. The proposed BFSPM machine combines the characteristics of bearingless permanent magnet machines and FSPM machines, offering the merits of high torque and suspension force densities, low coupling between torque and suspension force and direct and convenient suspension force regulation performance. First, the machine configuration and operation principle are introduced. Then, the mathematical mo-dels of torque and radial suspension force are built. Furthermore, several leading parameters of the machine are optimized to achieve the maximum average values and the minimum ripples of torque and radial suspension force. Finally, by using the finite element method, the electromagnetic performances including the no-load EMFs of torque winding and suspension winding, torque, suspension force and the coupling between torque and suspension force are analyzed, verifying the advantages of the proposed BFSPM machine.
2017 Vol. 35 (12): 1096-1104 [Abstract] ( 582 ) [HTML 1KB] [ PDF 2207KB] ( 1068 )
排灌机械工程学报
　

WeChat QR code
　

News

 　
· Call for paper of The 14th Asian International Conference on Fluid Machinery(AICFM14)
· Call for paper of the 2nd International Symposium of Cavitation and Multiphase Flow (ISCM 2016)
· JDIME have be selected for the 2015-2016 China Science Citation Database (CSCD)
· CALL FOR PAPERS and 2nd ANNOUNCEMENT"The 7th International Conference on Pumps and Fans(ICPF2015)"
· The journal won the first prize of "excellent China sciencepaper online journal" again
· WeChat is Running
· A New Column “Irrigation and Drainage Equipment Manufacturing Technology”Setting Up
· CALL FOR PAPERS “8th INTERNATIONAL SYMPOSIUM ON PUMPING MACHINERY”
　　　　　　　　        　　More 
　

WeChat QR code

主管单位
 江苏省教育厅
主办单位
 江苏大学
协办单位
 中国农业机械学会排灌机械分会
 国家水泵及系统工程技术研究中心
 中国农业工程学会农业水土工程专业委员会
主　　编
 袁寿其
编辑出版
 《排灌机械工程学报》编辑部
责任编辑
徐云峰  张文涛 陈建华
谈国鹏  朱漪云 盛    杰
　

Links

 　
· KSB
· National Research Center of Pumps
　　　　　　　　        　　More 
 

Copyright © 2011 Journal of Drainage and Irrigation Machinery Engineering
Support by Beijing Magtech Co.Ltd   E-mail: support@magtech.com.cn