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Journal of Drainage and Irrigation Machinery Engin
 
2009 Vol.27 Issue.6
Published 2009-11-30
article
Article
341 Orthogonal design of complex impeller of centrifugal pump with super-low-specific-speed
Qi Xueyi,Hu Jiaxin,Tian Yabin
Based on the four main factors influencing the design of short-blade of complex impeller which contains the number of short-blade,the radial inlet position,the bias angle in peripheral direction and the deflection angle,16 different types of complex impellers with different combinational form of short-blades have been designed.By range analysis of the orthogonal designing scheme,the sequence affecting pump head and efficiency of the four main factors were obtained,the number of short-blade,the deflection angle,the bias angle in peripheral direction,the radial inlet position and the number of short-blade,the radial inlet position,the bias angle in peripheral direction,and the deflection angle,meanwhile the best design scheme of short-blade was given.Performance tests were conducted by the CFD software.The test results show that the distribution of pressure field and velocity field of the compound impeller designed by orthogonal design are reasonable,the Q-H curve is more flat and the Q-η curve shifts to the larger flow rate.In the same design conditions,the centrifugal pump with complex impeller works with good performance at larger flow rate.
2009 Vol. 27 (6): 341-346 [Abstract] ( 1774 ) [HTML 1KB] [ PDF 482KB] ( 1614 )
347 Numerical simulation of internal flow field of self-priming irrigation pump
Liu Jianrui,Su Qiqin,Xu Yonggang,Wang Dongmei
 In order to study the effect of the valve and outer pump casing on self-priming irrigation pump efficiency,the inner flow model of 50ZB-25D self-priming irrigation pump was built by three-dimensio-nal modeling software,and the pump efficiency was calculated by FLUENT software under three different conditions:recycling valve closed,recycling valve not used,recycling valve closed but the influence of outer pump casing ignored.To verify the calculation accuracy of pump efficiency with FLUENT,the pump efficiency was tested experimentally.To further study gas-liquid two-phase flow in the pump self-priming process,three-dimensional simulation was performed for the gas-liquid two-phase unsteady turbulent flow by using FLUENT software with Mixture model.The results indicate that the valve has great influence on the self-priming irrigation pump efficiency,but the complexity of the outer pump casing structure has little effect.The numerical results agree favorably with the experimental data with discreparcies less than 3% in efficiency and less than 1.5 meters in head.
2009 Vol. 27 (6): 347-351 [Abstract] ( 1926 ) [HTML 1KB] [ PDF 370KB] ( 1535 )
352 Numerical analysis of cavitation flow in vortex-valve piezoelectric micropump
He Xiuhua,Deng Xulian,Yang Song,Bi Yushi,Jiang Quanying
 A vortex-valve piezoelectric pump was proposed,and numerical analysis was done to simulate it by using dynamic mesh model.Dynamic simulation was carried on the piezoelectric pump to get the inner flow fields,thus the velocity profiles and pressure distributions in the pump at different processes were obtained.The dynamic mesh model effectively simulates the fluid-solid coupling dynamic characteristic between the piezoelectric vibrator and fluids,which demonstrates its feasibility in simulating moving boundary of piezoelectric pump.Dynamic mesh model was also applied to study the effect of driving frequency,amplitude of piezoelectric vibrator and height of pump chamber to pump output performance.It is found that when driving frequency decreases,the vibrator amplitude and the pump volume flow rate increases,while the flow rate reaches maximum as pump chamber is about 250 μm high.Cavitation simulation was also carried on the vortex-valve and the whole pump,and vapor-liquid distributions at different moments were obtained,providing some basis for prediction for cavitation phenomenon in piezoelectric pump and looking for cavitation prevention methods.
2009 Vol. 27 (6): 352-356 [Abstract] ( 1983 ) [HTML 1KB] [ PDF 413KB] ( 1844 )
357 Development and capability of a radial piston pump for heavy oil transportation  
Gao Xiyan,Fang Wu,Wang Yan,Bai Minli
A new flat valve type radial piston pump for heavy oil transportation is introduced in the article.This new radial piston pump uses many independent shakeable cylinder blocks besides mechanical mandatory return stroke.Compared to the traditional reciprocating pumps,it is more compacter in frame,smaller in size,lighter in weight and lower in flow capacity pulsation rate,and so on.In accordance with the standard testing of GB/T 7784—2006,under the rated working condition,the pump mechanical efficiency is extended to 89% while the pump volumetric efficiency is extended to 92%.Besides,a reliability test which lasted three months was done for a prototype of this new pump in Liaohe oil region.During this test,the prototype ran smoothly with no malfunction and no leakage.So this new pump has good application prospects as a kind of energy-saving product.
2009 Vol. 27 (6): 357-361 [Abstract] ( 1636 ) [HTML 1KB] [ PDF 314KB] ( 1337 )
362 Study on performance of low specific speed sewage pump with different vane wrap angles
Cao Weidong,Li Yue,Zhang Xiaodi
To study the coupling flow filed of impellers with different vane wrap angles in the same volute,numerical simulations were performed for a sewage pump by using commercial software FLUENT 6.2.The Reynolds-averaged Navier-Stokes equations was discretized,solved with standard k-ε turbulence model and the SIMPLE algorithm in double coordinate system.The pressure and velocity distributions both in impeller and in volute were gained providing basis for the performance prediction,the hydraulic design and optimal design of a low specific speed sewage pump.The velocity distribution on the side of the impeller with 190° vane wrap angle is better than with other vane wrap angles,and the pressure distribution near the volute tongue of this impeller produces a certain obviously smaller high-pressure zone.Furthermore,the optimal scheme pump character gained experimentally was compared with simulating prediction.The results show that while other hydraulic geometrical parameters of a low specific speed sewage pump fixed,with the vane wrap angle adding,there exist significant differences of inner flow and a maximum value of pump efficiency.
2009 Vol. 27 (6): 362-366 [Abstract] ( 2010 ) [HTML 1KB] [ PDF 402KB] ( 1727 )
367 Influence of inlet flow of collecting pipe shape on hydraulic characteristics for roto-jet pump
Liu Yi,Song Huaide,Chen Jianxin,Li Yongle
The continuity equation,momentum equations have been solved in staggered grid by Simplec algorithm.A full three-dimensional numerical simulation has been done in the internal flow of the rectangular impellor,the rotor cavity and the collecting pipe.The distribution of velocity and pressure in the collecting pipe and the rotor cavity are shown by analyzing internal flow in the roto-jet pump.Comparing their pros and cons of the five models,especially,the shape of collecting pipe inlet has a great impact on the internal flow.The results show that the long radius axle of the elliptical import in the collecting pipe is consistent with the radius of the rotor cavity.Not too large difference for the long and short radius benefits resolving the cross section sufficient inflow and even reducing the hydraulic losses.The optimization parameter combination is obtained by comprehensive data balance analsis and comparision.The results provide a theoretical basis for the roto-jet pump performance prediction,the optimization design of collecting pipe and analysis of energy losses.
2009 Vol. 27 (6): 367-372 [Abstract] ( 1737 ) [HTML 1KB] [ PDF 458KB] ( 1280 )
373 Research on improvement of reciprocating seal life of special piston pump
Ye Xiaoyan,Ding Yana,Xu Jianqiang,Zhang Junhui
With respect to the problems of piston and filler seal life of special piston pump transporting medium with particles,considering from tribological mechanism of the contact reciprocating seal,the linear velocity of plunger was reasonably controlled to reduce the friction velocity and optimally design the seal of piston and filler through optimal matching of the plunger diameter,the stroke,and the pump speed.By solving the laminar flow in the gap and controlling the pressure of flushing fluid it was guaranteed that in full-pressure seal system,the fluid film of contact zone was working under the mixing lubrication state with a good lubrication.Two packing seal schemes were designed,matched and tested with plunger of different surface treatments and different kinds of filler.It is shown that after accumulating running 4 455 h the wear loss of combination 1 and combination 2 are only 0.03 mm and 0.05 mm,repectively.In practical use,the improved seal design can enhance the life of piston and filler from 1 500 h to more than 4 500 h.  
2009 Vol. 27 (6): 373-378 [Abstract] ( 2054 ) [HTML 1KB] [ PDF 379KB] ( 2352 )
379 Development of multi-function experimental platform for pump and devices model
Lang Tao,Shi Weidong,Ma Xinhua,Zhang Desheng,Zou Pingping
 A multi-functional experimental platform for pump and device model DN 500 mm(Technical and Research Center of Fluid Machinery Engineering,Jiangsu University)was introduced with its main technical specifications and system structure.The methods to improve precision were analyed,and the precision was tested by uncertainty theory.During this platform development,10 groups of performance data were got by repeated measuring a model pump with 500 specific speed at same state,then uncertainty of type A was obtained.From precision analysis of measuring instrument,uncertainty of type B was obtained.Combining type A with type B component,the uncertainty of this pump model is 0.25%,less than 0.40% of Water Industry Standard SL 140—2006.The analysis shows that main influence factors on the platform test precision are water-cycle system and measurement-control system.This experimental platform has adequate measurement accuracy and can meet the needs of various kinds of experiment.It has a great significance in improving the manufacturing level of the related pump industry and research lever on pump and device model.
2009 Vol. 27 (6): 379-383 [Abstract] ( 1631 ) [HTML 1KB] [ PDF 340KB] ( 1487 )
384 Experiment on blueing technique of low-carbon steel for electromotor stator of micro electric pump
Wang Yang,Fu Jianhui
Compared to silicon steel sheet,low-carbon steel has its advantages of rich resources and low price.In order to reduce cost of micro electromotor of micro electric pump used in pump industry,an experimental study of the application of low-carbon steel instead of silicon steel sheet on the electromotor of micro electric pump was carried out.The mechanism of annealing and blueing was analyzed.A process of annealing and blueing treatment for stator of low-carbon steel was designed.In order to make a comparative analysis of the main technical specifications such as no-load and full-load current,efficiency,temperature rise,and power factor of electromotor between low-carbon steel stator and silicon steel stator,a performance test of electromotor of electric pump installed with the stator of low-carbon steel was conducted.The experimental results show that the electromagnetic properties of low-carbon steel sheet after annealing and blueing treatment reach the technical specifications of silicon steel,so it is workable to be taken as alternative material for silicon steel sheet for stator of electromotor of motor pump.
2009 Vol. 27 (6): 384-387 [Abstract] ( 1500 ) [HTML 1KB] [ PDF 346KB] ( 2116 )
388 Study of guide wall structure influence on performance of rotational flow self-priming pump
Wang Chunlin,Liang Jun,Yi Tongxiang,Liu Hongguang,Wu Zhiwang
The internal 3D flow field of rotational flow self-priming pump was simulated numerically by using commercial CFD software FLUENT.Standard k-ε model was adopted in calculation,and reference frame model was chosen to couple the static-dynamic flow field of impeller and volute.The flow fields of pressure and turbulent kinetic energy near guide wall were obtained,and guide wall influence on flow field was analyzed.A performance prediction model was established.The influence of guide wall structure on performance was discussed by comparing the prediction performances of three models with diffe-rent guide wall wrap angles of 55°,65°,70°.It is shown that the guide wall structure has some influence on the performance and wrap angles of 65° is the optimal structure from three guide wall structures.The predicted results are also in agreement with experimental results.
2009 Vol. 27 (6): 388-392 [Abstract] ( 1608 ) [HTML 1KB] [ PDF 375KB] ( 1465 )
393 Numerical simulation and performance prediction for large-scale shaft-well tubular pump unit
Zheng Yuan,Xiao Yuping,Liu Wenming,Huang Yu
Based on the Reynolds-avaraged equations of three-dimensional incompressible fluid and the Spalart-Allmaras one-equation turbulence model,the whole flow of Shaft-Well Tubular Pumping Station was numerically simulated by using SIMPLEC algorithm.The flow pattern in flow channel and the static pressure distribution on the impeller were analyzed to reveal the flow mechanism in the Shaft-Well Tubular Pumping channel.The flow rate and efficiency of the pump device were predicted and compared with the model test results.It is shown that the flow in the out flow channel is a spiral movement combining axial and rotary moving,and blade static pressure distribution takes on a obvious rule with higher static pressure on the lifting surface than on the suction side and denser contour distribution on the suction surface than on the lifting surface.Performance prediction results coincide well with the model test data.
2009 Vol. 27 (6): 393-397 [Abstract] ( 2510 ) [HTML 1KB] [ PDF 379KB] ( 1739 )
398 Numerical analysis on flow field in mechanical seal with porous seal ring face  
Chen Huilong,Zhai Xiao,Zhao Binjuan,Yang Shenghua,Li Ya′nan,Chen Ping
In order to analysize the inner flow mechanism in the mechanical seal with laser-textured porous face,the single pore of sealing surface was chosen as a model and the N-S equation and k-ε equations were computed based on Computational Fluid Dynamics(CFD) method.The distributions of pressure,velocity and energy were educed when there was no differential pressure on the two sides of ring,as well as the distributions of a static and dynamic pressure when there had differential pressure on the two sides of ring.By analysis,it is found that a suitable size of micro-pore can cause hydrodynamic pressure effect produce a open force in the meantime.Influenced by the pressure difference on the two sides of micro-pore face,the dynamic pressure was changed there,producing film resistance and preventing leaking.This work can give some theoretical references for better understanding of hydrodynamic pressure effect in the mechanical seal with porous seal ring face and optimal design of micro lubricative pores.
2009 Vol. 27 (6): 398-402 [Abstract] ( 2065 ) [HTML 1KB] [ PDF 456KB] ( 1457 )
403 Experiment and mechanism analysis on improving flue gas desulfurization efficiency by electrostatic spray
Wang Zhentao,Luo Tiqian,Chen Huilong,Li Qingli
In order to study the plus removal efficiency by electrostatic spray and discuss the relation of mass transfer and droplets surface,charge,and movement characteristics,the experimental investigation of flue gas desulfurization was carried out by electrostatic water and lime slurry spray.SO2 absorption efficiencies with different liquid to gas ratios,Ca/S ratios and electrostatic voltages were obtained,and a maximum removal efficiency increment 10% was achieved.The results indicate that SO2 removal efficiency increases with the increasing of liquid to gas ratio,Ca/S ratio and electrostatic voltages adding,and the trend gradually becomes slower and slower.The high voltage field can improve the surface absorption characteristics and increase Ca2+ concentration on the droplets surface.Droplets surface tension minishing can reduce the mass transfer resistance between the droplets and flue gas,and droplets electrification and non-excess charge polarization enhance the mass transfer impulse force of droplets absorption SO2.Moreover,the second atomization under high elestrostatic voltages can decrease the droplets diameter and add the reacting surface.The droplets can distribute uniformity in the tower for the droplets provided with the same polarity charge.SO2 absorption efficiency improvement is the complicated result from the above factors.
2009 Vol. 27 (6): 403-408 [Abstract] ( 1959 ) [HTML 1KB] [ PDF 416KB] ( 1553 )
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