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Journal of Drainage and Irrigation Machinery Engin
 
2008 Vol.26 Issue.5
Published 2008-09-25
article
Article
1 Probabilistic analyse of pump shaft based on ANSYS/PDS
SHI Wei-dong, YAN Pin-lan, JIANG Xiao-ping, SUN Xiang-chun, LI Qi-feng
The geometric dimensions,load,stress and fatigue limit are taken as random variables to establish the pump shaft model.The 3D solid model is established by Pro/E software and imported into ANSYS to make the static stress analysis.The probability analysis files are created and the reliability of pump shaft with PDS module is calculated by Monte Carlo simulation technique.The method can obtain higher precision of failure probability of the pump shaft than the traditional design.A reliability assessment for the DLY25—270/9—37 to the model of vertical multi-stage pump shaft is demonstrated as a numerical example.The reliability of the pump shaft is 99.87% in the confidence level of 95%.It shows that the method is feasible and has important application values.
2008 Vol. 26 (5): 1-4 [Abstract] ( 1446 ) [HTML 1KB] [ PDF 176KB] ( 1575 )
5 Design and implementation of online liquid leaking excluder device for submersible pump
ZHU Rong-sheng, LI Ji-zhong, FU Qiang, WANG Xiu-li
Considering the problem that liquid leaking seriously affects the motor runs in large and medium sized submersible pump for the conventional design of gas-liquid ejectors,a simple structure to facilitate the operation of the liquid leaking excluder devices online was designed.Compressed gas was used as the working fluid to exclude the leaked liquid,and the best working pressure was measured.To optimize the design,under the best working pressure,fixed on the height of 6 m,the flow rate were measured at the length(from nozzle-mixing tube to the nozzle) of 0.8 times,1 times,1.5 times and 3 times of the nozzle diameter respectively.The optimization results show that there exists an optimal size of nozzle-mixing tube for the length of the device with the highest performance.In the experimental tests,the pumping flow rates of water were measured and compared for design optimization.
2008 Vol. 26 (5): 5-8 [Abstract] ( 1241 ) [HTML 1KB] [ PDF 177KB] ( 1216 )
9 Shaft extension tubular turbine performance analysis based on CFD calculation
QI Xue-yi, ZHANG Qing
Considering for GD008—WZ—140 shaft extension tubular turbine in some hydropower station,which has serious problems such as loss effort,vibration and noise,CFD was used to study the main reason of the problems.Based on the simulation results and performance prediction,the LGD08—WZ—140 runner was designed.The flow in the new runner coupled with the original flow passage was stimulated.The results of performance prediction and trial operation show that,the power can exceed the original design standard requirements,the noise reduces from 95 dB to 83 dB,and the vibration is basically eliminated.Therefore,the transformation of this runner is a success.
2008 Vol. 26 (5): 9-13 [Abstract] ( 1471 ) [HTML 1KB] [ PDF 953KB] ( 1420 )
14 Optimization design of V-shape tube based on orthogonal design
HE Xiu-hua, ZHANG Rui, YANG Song, DENG Xu-lian
Based on the flow characteristic of diffuser/nozzle in valveless piezoelectric pump,a new type of V-shape tube is presented.In order to acquire the optimum characteristic of flow resistance of the V-shape tube,it is essential to optimize its structural parameters.Based on the orthogonal design method,and by using the finite element simulation,a four-factor and three-level orthogonal scheme was put forward.The data was analyzed through simulating experiment and the order of the influencing factors to the flow resistance of V-shape tube was obtained.Meanwhile,a relatively new reasonable scheme was gained.By redesigning,analyzing,and comparing with that from orthogonal scheme,the new scheme was proved to be more advantageous.
2008 Vol. 26 (5): 14-17 [Abstract] ( 1114 ) [HTML 1KB] [ PDF 304KB] ( 1156 )
18 Off-design flow field analysis and radial force prediction of centrifugal pump
WANG Yang, ZHANG Xiang, LI Yi-bin
By adopting Reynolds Averaged N-S equation and RNG k-ε model,the impeller-volute coupled characteristics are simulated by using SIMPLEC algorithm.Based on the analysis of the flow field,the radial force calculation model is presented.The radial forces are calculated under different flow rate conditions.The result indicates that the radial force is the smallest under the designed flow rate.By comparing the numerical results with that from Stepanoff equation,it shows that the differences between them are from minus to plus with the increase of the flow rate,and the relative error is small.
2008 Vol. 26 (5): 18-22 [Abstract] ( 965 ) [HTML 1KB] [ PDF 260KB] ( 1456 )
23 Numerical simulation of flow in cavitation-tank of pump test-bed
MA Xin-hua, HAN Lu, LIU Hou-lin
A cavitation tank was designed based on the range of measuring parameters for a multi-functional test-bed.As regard to the JM—211 mixing-flow pump with-2° blade angle,the cavitation-tank was simulated at the design point Q=2 200 m3/h by using the software FLUENT.The Reynolds Average N-S Equations,standard k-ε turbulence model and SIMPLEC algorithm were adopted.The distributions of velocity and pressure in the cavitation-tank,the rectifiers and the exit were analyzed.The calculation results were compared with those from experiments.The calculated results indicate that the distributions of velocity and pressure after the rectifiers are well-proportioned,and the decreased pressure difference was 250 Pa.The pressures of the pump inlet and outlet of the cavitation-tank were close,and the error of predicted pressure was merely 1.79%.The design of inlet and rectifiers of the cavitation-tank can achieve the required steady pressure at the pump inlet.
2008 Vol. 26 (5): 23-26 [Abstract] ( 1256 ) [HTML 1KB] [ PDF 432KB] ( 1192 )
27 Program on design of double cylinder hydraulic-driven diaphragm pump
ZHANG Hong-sheng, CHEN Qiang, WANG Dong-mei
In view of the problems of the mud pump and diaphragm pump used in industries of electric power,metallurgy and chemical,a new type of driving force used in the hydraulic-driven diaphragm pump was designed.Compared with the driving force used in the traditional pumps,the hydraulic-driven was used to replace the crank linkage one.It is driven by high-power motors.The moving direction is changed by using the confined space on the end of the hydraulic cylinders to make the pistons to achieve a uniform reciprocating linear motion(the pistons in the traditional design make a sine curve movement).The new diaphragm pumps will fundamentally solve the uneven problem in the traditional ones when inhaling slurry,as well as vibration,noise and other major issues,and will largely reduce the size and cost of the pump.
2008 Vol. 26 (5): 27-29 [Abstract] ( 1318 ) [HTML 1KB] [ PDF 141KB] ( 1453 )
30 Analysis on performance of submersible pumps based on different impeller outlet areas
LIU Zai-lun, XU Xia
According to curve equations of diffuser and impeller in submersible pump,the best condition point is determined.Based on the areas ratio principle,the different impeller outlet blade angles are analyzed;and experiments with the same diffuser coupling different impellers are carried out.The experimental results show that pump performance curve will change with different impeller blade angles;under a constant throat areas ratio,a pump with high efficiency can also be obtained for the submersible pump with one diffuser coupling with different impellers.By analyzing and comparing the calculated results with the testing points of best condition,the relative errors of head and flow are less than 0.06 and both are consistent well.
2008 Vol. 26 (5): 30-33 [Abstract] ( 1026 ) [HTML 1KB] [ PDF 171KB] ( 1201 )
34 Calculation of throat pipe length in CP type jet pump based on numerical simulation
GU Qing-chun, YU Zhi-jun, WANG Feng-jing, LONG Xin-ping
Based on SIMPLE algorithm and RNG k-ε turbulence model,numerical simulation was carried out to calculate the inner flow field of the CP type jet pump with throat pipe of different lengths.By comparison and analysis on their performance and inner flow field,it was found that the throat pipe lengths has important effect on the performance,the pressure distribution as well as the inner flow field of the jet pump.Regardless of cavitation,with the length of throat pipe in the range of(2.5~6.0) times of throat diameter,the peak efficiency will also increase and the point of peak efficiency will move to the right to the larger flow rate ratio region.By analysis of the efficiency,the kinetic energy correction coefficient α and the momentum correction coefficient α′ at the throat outlet section together with the pressure distribution,it revealed that in the range of(3.7~4.5) times of throat diameter,the jet pump performs best in the design duty point,which must be the optimal length of throat pipe for the CP jet pump.
2008 Vol. 26 (5): 34-37 [Abstract] ( 1132 ) [HTML 1KB] [ PDF 209KB] ( 1181 )
38 Influence of relative position of diffuser inlet edge on performance of nuclear model pump
WANG Chun-lin, PENG Na, ZHAO Bai-tong, SI Yan-lei
Reynolds time-averaged N-S equations,standard k-ε turbulent model,three-dimensional non-structural tetrahedral mesh,and multiple reference frame model were used to calculate the three-dimensional turbulent flow of nuclear model pumps with two different diffusers under the design condition.The static pressure distribution in interior flow field was obtained.Continual increased trend of static pressure from impeller inlet to spherical shell and unsymmetrical character in the diffuser were discovered.Streamlines of the two model pumps were compared and analyzed.The results can be used to study the interior flow field characteristics of the nuclear model pump,and will provide some useful references for hydraulic optimized design.
2008 Vol. 26 (5): 38-41 [Abstract] ( 1114 ) [HTML 1KB] [ PDF 411KB] ( 1250 )
42 Numerical calculation of cavitation for inner flow field of variable-pitch inducer
YUAN Dan-qing, LIU Ji-chun, CONG Xiao-qing, WANG Guan-jun
The design method of inducer was introduced to get some main parameters of IH65—50—160 pump inducer.The Euler multiphase flow model,the standard k-ε turbulent model and three-dimensional non-structural tetrahedral mesh were adopted to calculate the three-dimensional flow field for the variable-pitch inducer to obtain the distributions of pressure and phases of inner flow field.The simulated results show that,arc impeller blade inlet can improve the operation conditions of inducer inlet and the anti-cavitation performance of itself.Based on the analyses of impeller outlet pressure fluctuations and inlet gas share rise,the causes of channel vortex are outlined.The study probides reference for improving the design and optimizing the hydraulic design of inducer.
2008 Vol. 26 (5): 42-45 [Abstract] ( 1484 ) [HTML 1KB] [ PDF 295KB] ( 1262 )
46 Equation of new type of cylindrical blade with adjustable wrapping angle of centrifugal impellers
YAN Jing, ZHANG Jiang-yuan, HE Min, WANG Tao
Blade wrapping angle is an important geometric parameter pertinent to blade passage divergence and flow separation inside centrifugal impellers.Cylindrical blades are extensively used in low specific speed impellers.Currently several types of cylindrical blades exist,but their wrapping angles are all determined by boundary conditions at blade entrance and exit,and can′t be specified and adjusted by designers,which has been a significant problem in improving cylindrical blade performance.Based on interpolation method in a polar coordinate system,an interpolating function of the projected curve of a new type of cylindrical blades is formulated.The most notable feature of the new curve is that its wrapping angle can be specified by impeller designer.The process and results in deriving the interpolating function of the new curve are presented;four term expressions contained in the equation are obtained.Meanwhile,some geometric properties are analyzed,which proved the blade angles at exit and entrance of the curve equal to the angles required.This kind of cylindrical blade will be beneficial to improving hydraulic performance and efficiency of low specific speed impellers.
2008 Vol. 26 (5): 46-49 [Abstract] ( 1095 ) [HTML 1KB] [ PDF 165KB] ( 1060 )
50 Shaft tubular pump system with symmetric aerofoil blade
CHENG Li, LIU Chao, TANG Fang-ping, ZHOU Ji-ren
In order to get the same performances at the two-way operating conditions,a symmetric aerofoil can be used where the suction surface is the same as the pressure surface.The reversible impeller with the symmetric aerofoil was designed to achieve two-ways pumping function for environmental water treatment engineering.Numerical simulation of three-dimensional turbulent flow was applied to the reversible suction box for shaft pumping station.The key dimension of passages and shapes were optimized by CFD.Based on the National test standard and criterion,the hydraulic performances of 5 impeller angles were tested on the high-precise hydraulic machinery test rig from lager flowrate to small flowrate.The model test results indicated good performance characteristic.The prototype performance conversed by Mode equation revealed that the bi-directional shaft-well tubular pumping system could be operated on the BEP and the efficiency could be achieved above 60%.The research results could be applied to design the similar type of pumping stations.
2008 Vol. 26 (5): 50-54 [Abstract] ( 1852 ) [HTML 1KB] [ PDF 243KB] ( 1421 )
55 Numerical simulation for 3D turbulent flow and hydraulic loss of inlet conduit for pumping station
LU Lin-guang, XU Lei, LIANG Jin-dong, LIU Jun, HUANG Jin-jun
Consistent with the method of separately testing hydraulic performance of inlet conduit,a new method to separately calculate hydraulic performance of inlet conduit is put forward.Problems relative to the numerical simulation,such as calculation region,boundary conditions,grid generation etc.are introduced.Examples about the flow pattern simulation and hydraulic loss calculation of 3 types of inlet conduit,including elbow inlet,bell-like inlet and dustpan-like inlet are illustrated.Numerical calculation results are compared with those from model tests.The results indicate that the method of 3-D numerical calculation can calculate the hydraulic loss of inlet conduit with good accuracy and the loss can be verified conveniently by model test.Furthermore,the method could be applied to examine and evaluate the hydraulic performance of inlet conduit,which will create a necessary condition for the hydraulic optimum design with multi-plans.
2008 Vol. 26 (5): 55-58 [Abstract] ( 1109 ) [HTML 1KB] [ PDF 429KB] ( 1452 )
59 Theory and structure design of two-ways step running complete fluidic sprinkler of PXSB type
LI Hong, YANG Yan-cai, XIANG Qing-jiang, XU Hong-xia, XIE Fu-qi
To overcome the problems existed in domestic impack sprinklers,such as complex structure,short service life,and high cost,a new type of large and middle rotary two-ways step running complete fluidic sprinkler of PXSB type is proposed.Its basic working principle is described.The normal work conditions are proposed,such that both sides of cover plate at the outlet of sprinkler need gaps,and both positive and reverse pipes need air compensating holes in proper position.The results show that,the two-ways step running of sprinkler is achieved by cooperation of fluidic elements and two-ways step running inverting mechanism switching.The forward and reverse step runnings of sprinkler are achieved by controlling the flow direction of signal water,which improve the hydraulic performance such as water distribution uniformly.The two-ways step running structure improve the stability and reliability of the sprinkler performance,and the rolling bearing device and seal structure optimize the sealing performance of sprinkler.
2008 Vol. 26 (5): 59-63 [Abstract] ( 1621 ) [HTML 1KB] [ PDF 206KB] ( 1254 )
64 Experiment on induction charging effect of injection spray of electrode circle diameter
YANG Chao-zhen
A standard nozzle with the flow rate of 4.92 ml/s is used to study the effect of the diameter of circular electrode upon the charging property of droplets.Under the same spray pressure and the liquid medium,five electrode diameters with different sizes and different installation positions are selected for injection charging spray.Net target method is employed to collect and measure the current.The quality of mass droplets and the charge-mass ratio are selected for evaluation of charging property.The analysis of the effect of charging voltage and electrode circle upon the charging volume reveals that the ratio is proportional to charging voltage and varies with different electrode circle diameters while the ratio is also linear to the electrode diameter and changes with the electrode size.The study provides scientific ground for the structural design,coefficient optimization,quantitative calculation of the ratio and analytical 67evaluation of electrode.
2008 Vol. 26 (5): 64-67 [Abstract] ( 1485 ) [HTML 1KB] [ PDF 167KB] ( 1306 )
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