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Journal of Drainage and Irrigation Machinery Engin
 
2008 Vol.26 Issue.6
Published 2008-11-25
article
Article
1 Numerical simulation on performance of self-regulating jet pump
LONG Xin-ping, GUAN Yun-sheng, HAN Ning, CHENG Zhi-yi, L Jun-xian
The performance under different relative nozzle openings of a self-regulating jet pump,with nozzle outlet area controlled by a needle,was simulated by RNG k-ε turbulence model and SIMPLE algorithm.It is found that the needle exerts influence on the performance of the pump.With the decrease of the nozzle opening and increase of the needle itinerary,the needle has more impacts on the efficiency of the pump.Comparison between the calculated and experimental data shows that the two agree well with each other when the nozzle opening is large.While under smaller nozzle openings especially when the jet pump working in small flow rate ratios,there exist some deviations between the calculated and measured results,though they present the same tendency.Based on the analysis of above mentioned deviation,a correlation was proposed to predict the actual performance of the self-regulating jet pump based on nume-rical simulation.This formula can predict the actual performance and provide guidance for the design of self-regulating jet pumps.
2008 Vol. 26 (6): 1-5 [Abstract] ( 1133 ) [HTML 1KB] [ PDF 353KB] ( 1828 )
6 Inner flow of new-type streamline shape XCK mixer with two blades
SHI Wei-dong, TIAN Fei, CAO Wei-dong, ZHANG De-sheng, LI Wei
The inner flow of a new-type streamline shape XCK mixer with two blades was simulated by using unstructured-tetrahedron grid and MRF technology in Fluent 6.0.The flow characters of the mixer at different heights installation were compared.The mixing effects by axial-flow blade and runoff-flow blade were compared,and the former showed better mixing effect than the latter.Results show that the mixer′s flow is axial-symmetrical and the axial-flow is the most prominent as the mixing blades are fixed in the center of the mixing tank.
2008 Vol. 26 (6): 6-9 [Abstract] ( 1355 ) [HTML 1KB] [ PDF 303KB] ( 1498 )
10 Analysis of interior flow in self-priming vortex pump
SHA Yi, LI Jin-lei, LI Chang-feng
Based on the Reynolds Averaged Navier-Stokes Equations(RANS) and k-ω two-equation turbulence model,the interior flow field in a self-built self-priming vortex pump has been numerically simulated by using FlUENT software.The pressure-velocity fields are coupled and solved by the SIMPLEC algorithm.From the analyses and comparison between the numerical results and the measurement data,characteristics from the five-hole probe static pressure pump experiment are obtained.Explanations are given for the occurrence of cavitations and vortexes in longitudinal and radial directions in the vortex pump.The total pressure and velocity distribution in the self-priming vortex pump are obtained,and the relationship between pressure,flux and the pressure changing trend along the pump circumference are deduced as well.The characteristic of pressure non-linear increase along the pump circumference is useful for the optimum design of the self-priming vortex pump.
2008 Vol. 26 (6): 10-14 [Abstract] ( 1403 ) [HTML 1KB] [ PDF 357KB] ( 1612 )
15 Axial force computation of canned motor pump based on visual C++ 6.0 software
KONG Fan-yu, GAO Cui-lan, JI Jian-gang, ZHANG Hong-li, LIU Hou-lin
In order to overcome the disadvantages of the traditional manual computational method and to calculate axial force of canned motor pump quickly and easily,a computation procedure is compiled as a convenient tool based on Visual C++ 6.0 software,which considers the composite factor impacting the axial force.The modularized structure system is used and each module corresponds to one interface.The man-machine conversation interface is achieved nimbly and the contact surface is clear,so the parameter optimization design is carried out conveniently.By inputting the corresponding design parameters,the procedure will display the computed result of balanced axial force automatically,which is simple and quick.The work efficiency is greatly improved compared with the manual computational method.The computed result is compared with the measurement.The relative error is within 10%,which confirms that the procedure has good accuracy.
2008 Vol. 26 (6): 15-19 [Abstract] ( 1213 ) [HTML 1KB] [ PDF 447KB] ( 1571 )
20 Model experiment of vertical axial-flow pump system for drainage pumping station
YANG Jing-jiang
In order to meet the requirements for the rebuilding of a drainage pumping station,a model experimental research on characteristics of vertical axial-flow pump system has been conducted.The vertical axial-flow pump model is comprised of a hydraulic model of specific speed 700,an elbow inlet and a straight outlet conduit.Performance and cavity characteristics of the model pump and the prototype pump are obtained,so is the runaway speed characteristics.At-4? of impeller blades install angle,the maximum efficiency of the model pump is 76.21% with head 6.39m and flow rate 0.298 m3/s.The maximum efficiency of the prototype pump is 83.87% with head 6.00 m and flow rate 25.9 m3/s.At the maximum head,the shaft power of prototype pump is less than 2 300 kW.The hydraulic model and optimal straight outlet conduit meet the operating condition of the pumping station.
2008 Vol. 26 (6): 20-23 [Abstract] ( 1302 ) [HTML 1KB] [ PDF 240KB] ( 1475 )
24 Design of gravity settling vessel for reciprocating mud pump
ZHANG Sheng-chang, WANG Zong-huai, DENG Hong-ying, ZHENG Shui-hua, ZHOU Jia
According to the gravity principles and the movement of crank and linking reciprocating mud pump,a gravity settling vessel is designed to prevent the solid particles into reciprocating pairs,to eliminate the damage of plunger and fitter caused by wear,and to improve the reliability.The numerical simulation of the inner flow field is done,and the trajectory and velocity field of solid particles are obtained,The results show the good performance of the vessel although the mud particles are very small.
2008 Vol. 26 (6): 24-26 [Abstract] ( 1115 ) [HTML 1KB] [ PDF 241KB] ( 1183 )
27 Effect of clearance of impeller wear-rings on efficiency of low specific speed centrifugal pump
WANG Yang, ZHANG Xiang
The experiments on different types of impeller are done by changing the clearance of wear-ring to prove that the clearance has no influence on the pump efficiency under various types of impeller.An algorithm for calculating the disc friction loss is developed in terms of energy conservation with consideration of the leakage rate.Based on this algorithm,a formula on the efficiency of a low specific speed centrifugal pump is deduced on the premise that the leakage rate is taken as the independent variable.Combined with formulas of hydraulic efficiency and volume efficiency,the conclusion is drawn that the pump efficiency decreases with the increasing clearances of wear-rings even though the mechanical losses decrease with the increasing of leakage rate.
2008 Vol. 26 (6): 27-30 [Abstract] ( 1611 ) [HTML 1KB] [ PDF 269KB] ( 2063 )
31 Optimization design for hydraulic end of high-pressure pump
YE Xiao-yan, YANG Sun-sheng, XU Jian-qiang, HU Jing-ning
To improve the efficiency of high-pressure pump and reduce the energy consumption of RO system,the selection and optimization of the high-pressure pump flow channel were carried out.Two kinds of integrated valves with good flow characteristics were designed.Numerical analysis was used.Firstly these models was designed in Solidworks 2007.Then the model was transferred to the preprocessing software Gambit 2.2.30 to be meshed.Finally the meshes were imported to Fluent 6.2 to proceed numerical ana-lysis.The results show that the second scheme has better flow characteristics,less hydraulic loss and higher efficiency.The second scheme was made according to the swirl distribution of scheme two.And a hydraulic end suitable for the reverse optimization osmosis seawater desalination system was obtained.After the design and optimization of the hydraulic end,the pump efficiency was increased to 93.36%,and unit efficiency was over 88%.
2008 Vol. 26 (6): 31-35 [Abstract] ( 1467 ) [HTML 1KB] [ PDF 383KB] ( 1542 )
36 Characteristic test of 15? slanting axis pump set
HE Zhong-ning, ZHOU Zheng-fu, TAN Qiang, JIANG Hong-mei, YUAN Jia-bo, CHEN Song-shan
Combined with the design of Wentouling large drainage pumping station in Huizhou City of Guangdong Province,the research on energy test,cavitation and runaway characteristics were conducted on a 15? slanting axis model pumping device,which was made up of slanting inlet and outlet passages.Based on experiments,the energy characteristic curves of model and prototype pump sets and runaway speed about the special blade angles and water head were obtained.The results prove that maximum efficiency of the pumping device is increased when the blade angle is decreased,and it is able to achieve 80% at blade angle of-4 degree.The designs of inlet and outlet passage profiles were optimized by CFD numerical simulation.The result shows that cavitation is satisfied and runway speed is safe,and the 15? slanting axis pumping device is an ideal low-head large pumping device.
2008 Vol. 26 (6): 36-40 [Abstract] ( 1176 ) [HTML 1KB] [ PDF 340KB] ( 1299 )
41 Numerical simulation and performance prediction of interior flow field for axial-flow pump with front guide impeller
WANG Chun-lin, ZHAO Bai-tong, PENG Na, SI Yan-lei
Based on Reynolds Time-Averaged N-S equations and the standard k-ε turbulent model,FLUENT software and SIMPLEC algorithm were used to simulate the three-dimensional incompressible turbulent flow fields in an axial-flow pump with and without front guide impeller under the design condition.The velocity and pressure distributions were obtained and analyzed.Meanwhile,performance predictions,and analysis of the head and efficiency with or without front guide impeller were done under different flow rate.With front guide impeller performance instability region became narrower,and its efficiency slightly decreased.By analyzing the interior flow field characteristics and the influence of front guide impeller on the performance of the axial-flow pump,beneficial references can be provided to its hydraulic optimized design.
2008 Vol. 26 (6): 41-45 [Abstract] ( 1105 ) [HTML 1KB] [ PDF 417KB] ( 1270 )
46 Analysis and brief introduction for a foreign-designed centrifugal pump of double-volute
YAN Jing, XIE Gong-die, ZHANG Jiang-yuan, KAN Neng-qi
Double-volute is an important case form employed to balance radial thrust caused by centrifugal impellers under off-design operating conditions.However,very few reports are found to demonstrate its hydraulic performance and design principles.In this paper we analyze and describe the latest foreign data pertinent to double-volute.Based on extensive experimental results,the data present a more accurate empirical formula to evaluate radial thrust balancing effect between single volute and double-volute,and among different double-volute structures.We also show two approaches to determine outer sections of double-volute passage with the same flow rate: one is based on functions in foreign literatures;the other based on principle of conservation law of moment of momentum.
2008 Vol. 26 (6): 46-49 [Abstract] ( 1504 ) [HTML 1KB] [ PDF 230KB] ( 2294 )
50 Pump hydraulic stability appraisal by means of energy performances
ZHANG Ren-tian, , ZHU Hong-geng, YAO Lin-bi, WEI Jun
In order to evaluate the operational stability of large-scale low-head pumps in design and off-design conditions,based on the basic design theory of blade pumps,main factors affecting their hydraulic stabilities are analyzed,including inlet pre-swirl,outlet circulation axial-vortex and flow separation.Starting from the fundamental equations of blade pumps,a new concept of optimized operational condition was presented.According to the pump energy performances the equations of calculating turbulent losses for appraising pump hydraulic instability are formulated.Some calculations of various specific speeds are made to compare the measured pressure fluctuations with the calculated turbulent losses,and the identical results are obtained.It indicates that the methodology of pump operational stability appraisal by means of energy performances is feasible and realizable.
2008 Vol. 26 (6): 50-54 [Abstract] ( 1221 ) [HTML 1KB] [ PDF 308KB] ( 1412 )
55 Vibration signal de-noising of pump unit based on wavelet packets transform
ZHENG Yuan, TONG Chen-guang, XU Lun-gen, ZHANG Hai-li
The basic theory of wavelet packet and the general principles of signal de-noising by using wavelet packet were introduced.By combining the vibration test data of pump unit in a pump station in the Eastern Line of South-to-North Water Transfer Project,a vibration signal de-nosing was analyzed.In the signal de-noising,the Db4 wavelet with SURE threshold strategy and the 3 decomposition level were chosen.After the coefficient compression and wavelet packets reconstruction,the de-noising signal was obtained.The result indicated that wavelet packet was useful to deal with de-noise signal,and after de-noising the signal was the same as the original signal.This will be good for the further fault analysis of pump unit.
2008 Vol. 26 (6): 55-57 [Abstract] ( 1394 ) [HTML 1KB] [ PDF 222KB] ( 1746 )
58 Dynamic analysis of fluidic sprinkler controlled by clearance
LI Hong, YANG Yan-cai, XIANG Qing-jiang
In order to obtain the maximum wall-attachment moment and decrease the friction force moment,an optimization design on fluidic component was made to ensure the normal running of the sprinkler.The driving and friction force moment of the sprinkler were analyzed.The driving moments of the sprinkler was arised from the jet offset impacting to the wall and the outlet cover board of the fluidic component.The friction resistance moment of the sprinkler was generated by the resistance between sections of hollow shaft,hollow shaft and its cover,and sealing set.The equation of center streamline of offset jet was deduced according to momentum equation.A formula to calculate the distance of attachment point and the angle of the attachment jet was also deduced.The relation between the maximum attaching moment and geometric parameters was obtained theoretically.The moment equation and rotating angle equation of fluidic sprinkler were also deduced.
2008 Vol. 26 (6): 58-62 [Abstract] ( 1391 ) [HTML 1KB] [ PDF 260KB] ( 1439 )
63 Research status and prospect of vortex pump
YUAN Dan-qing, WANG Guan-jun, CHEN Xiang-yang, ZHANG Xiao-chun, ZHANG Xiao-wei
The basic principle,structural characteristics and classification of vortex pump are introduced.A brief review is given about the application,research history and status of the pump.The problems to be solved in vortex pump are discussed based on the work process,internal flow,design methods and experimental study of vortex pump.The development trend of vortex pump is also given,that is,advanced testing technology should be adopted to test and analyze the inner flow to discover the theories meanings.The unique roles of semi-open impeller and composite impeller are pointed out.
2008 Vol. 26 (6): 63-68 [Abstract] ( 1730 ) [HTML 1KB] [ PDF 471KB] ( 1909 )
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