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Journal of Drainage and Irrigation Machinery Engin
 
2009 Vol.27 Issue.3
Published 2009-05-30
article
Article
137 Precise calculation for points along meridional streamline of centrifugal pumps
Yan Jing,Wang Tao,Li Weicheng,Kan Nengqi
In order to improve the precision in blade drawing of centrifugal pump impellers and to shorten drawing period involved in conformal transformation methods,the calculation principles and methods are studied to determine the locations of dividing points along streamline when the front shroud streamline on meridional plane comprises two arcs tangential to each other.Based on mathematical analysis,3 possible locations of the first point on the lower arc which is a part of the front meridional streamline were described,and 3 tranncendental equations suitable to each case were derived.The solutions to these equations will determine the accurate locations of first point on lower arc and improve the shape of blade contours.The principles and methods presented here will alter the traditional manual way in blade drawing process and the resulting poor continuity and smoothness of blade contours.
2009 Vol. 27 (3): 137-139 [Abstract] ( 2097 ) [HTML 1KB] [ PDF 179KB] ( 1626 )
140 Numerical simulation of mixer power consumptions in different ponds
Shi Weidong,Tian Fei,Cao Weidong,Chen Bin,Zhang Desheng
利用FLUENT 6.0大型计算流体力学软件,采用非结构化四面体网格,动坐标系技术,k-ε湍流模型和SIMPLE算法,对城市污水处理中,矩形、直圆管、渐进圆管和突变圆管等4种池形的水池进行了全池数值模拟.分析了池内流体的速度场,并对不同水池中污水处理搅拌器消耗的功率进行了数值计算与分析,对其性能进行了预测.计算研究发现,在满足规范的池内整体流速条件下,渐进圆管水池中搅拌器消耗的功率最小;直圆管水池内流体流动较为稳定,渐进圆管水池内流体流动效果次之,突变圆管水池内的流体流动效果最差.因此,渐进圆管水池和直圆管水池是较理想的污水搅拌水池.
2009 Vol. 27 (3): 140-144 [Abstract] ( 1358 ) [HTML 1KB] [ PDF 306KB] ( 1656 )
145 Design of multistage flameproof submersible pumps with inner motor for coal mine
Cao Weidong,Li Yue,Sun Xinqing
Design methods of a multistage flameproof submersible pump for coal mine were introduced in details.The effects of base holes,cover height,volute flow passage and outlet position on pump hydraulic efficiency were analyzed,and the optimizations for those parts were done.Pump′s volumetric efficiency can be improved by using floating rings.Rotor′s radical flop is limited through setting a sliding bearing.Pressure at friction-pair of dual-end face mechanical seal is always larger than spring′s origin force through static ring optimization in oil chamber.The BQW80-180-90 pump experiment results show that the pump can run quietly due to the floating rings and sliding bearing,and its efficiency is increased by about 8% compared to that of MT/T 671-2005.Meanwhile the new mechanical seal is more reliable than the old one.To sum up,the new design of this kind pump has high efficiency and reliability.
2009 Vol. 27 (3): 145-149 [Abstract] ( 2684 ) [HTML 1KB] [ PDF 344KB] ( 1648 )
150 Design of lift pump for seawater reverse osmosis system
Hu Jingning,Pan Jinqiu,Zhou Guangfeng,Zhou Shenggui,Xiao Xiaping
 In order to solve the propblem of the large axial head force caused by high pressure entry,three methods were introduced,adjusting impeller wearing ring diameter,installing vice blades and reducing rotating speed.Adjusting impeller wearing ring diameter and installing vice blades on front cover of impeller can balance axial force of lift pump for 2 500 t/d SWRO,and the structure would be more reasonable if using the way of reducing rotating speed to increase impeller dimension to balance axial force.Based on the seawater desalination processes,the way to ensure the performance parameters of lift pump was introduced.In view of the high pressure entry environment.The combination structure of single-stage cantilever,double volute and three thrust bearing was chosen.Thick shaft and small cantilever ratio were used to improve the stability of the system.Through the operation of 100 h test at higher pressure environment,the lift pump it was found that can maintains good sealing performance by using upstream pumping mechanical seal and has small weal loss because of non-contact section,thus it can reduce the failure of shaft in the high pressure circumstance.
2009 Vol. 27 (3): 150-153 [Abstract] ( 2082 ) [HTML 1KB] [ PDF 316KB] ( 1498 )
154 Axial thrust equilibrator of multi-stage pumps in SWRO
Chai Liping,Wang Jun,Jiang Zhikun,Xiao Xiaping,Zhou Guangfeng
In order to balance the large axial force on the SWRO-HP pump,a program for calculating the axial thrust equilibrator is written by the VB 6.0,and a special equilibrator making up with balancing disc and balancing sleeve is designed by using the program.In order to get a better sensitivity on the balancing disc,the connection between the diameter of balancing disc and the force bear by the balancing piston is studied by using the program.The force bear by the balancing piston is 70%,and the range of sensitivity is 0.23～0.28,Based on these the size of geometry for equilibrator is confirmed.In order to avoid the end-plate of balancing disc to contact friction,the connection about the change of b2 and equilibrant is worked out by using the program.Compared with the test,the difference of the leakage rate is just 5.11%.The problem of large axial thrust which is brought by the SWRO-HP pump is successfully solved by the equilibrator.The leakage is 2.6% of the SWRO-HP pump′s flow rate,far less than the general multi-stage pump.
2009 Vol. 27 (3): 154-157 [Abstract] ( 2123 ) [HTML 1KB] [ PDF 239KB] ( 1529 )
158 Improvement design and experiment study of CB80-65-125 ship cooling pump
Liu Jianrui,Wang Dongmei,Su Qiqin,Xu Yonggang
A CB80-65-125 ship cooling pump was reformed to improve the limitations of the application conditions.FLUENT software was used to simulate the flow field for the optimization.The new type ship cooling pump was designed with thinner leaf blade with extended inlet,and smaller inlet diameter.The three-dimensional inner flow model was built in Pro/E.A simulation was performed to analyze the flow around the impeller inlet,to study the effects of geometry parameters of impeller on the hydraulic performance at the rated point,by using SIMPLEC algorithm and standard k-ε turbulence model.The experimental results indicate that the static pressure distribution and the relative velocity diffusion are uniform,and there is no obvious swirl and boundary-layer separation.So the design is reasonable.The efficiency of the new type ship cooling pump achieves to 67.9%,4.4 percent higher than the old one.The head is 20.8 m.The pump is relatively simple in structure and light in weight.Besides,the developed pump can also improve the cavitation resistance of the pump.
2009 Vol. 27 (3): 158-162 [Abstract] ( 1713 ) [HTML 1KB] [ PDF 335KB] ( 1521 )
163 Gas-liquid two-phase flow numerical simulation of a vortex flow self-priming pump
Wang Chunlin,Wu Zhiwang,Si Yanlei,Yi Tongxiang,Liu Hongguang
Gas-liquid two-phase flow of a vortex flow self-priming pump under self-priming condition was simulated by using reynolds time-averaged N-S equations,RNG k-ε turbulent model,and mixer model of multi-phase models in FLUENT.When the channel of impeller and volute were meshed,the size distortion rate was 0.78.The static pressure distribution of the pump from two-phase flow simulation was compared with that from single phase flow,and the relative velocities of the impeller between gas phase and liquid phase were compared.The distribution of gas volume fraction was analyzed.The results show that the static pressure of gas-liquid two-phase is slightly less than that of single-phase when self-priming.The main flow of the pump is the flow of liquid phase with the flow of gas through the phase entrainment effect.Liquid velocity is slightly larger than that of gas.The two channels near the outlet of the pump have obvious gas accumulation with higher gas voids.  
2009 Vol. 27 (3): 163-167 [Abstract] ( 1700 ) [HTML 1KB] [ PDF 357KB] ( 1791 )
168 Numerical analysis of centrifugal pump handling different viscosity fluid
Pan Zhongyong,Cao Yingjie
To learn about the flow behavior of centrifugal pumps handling different fluids under different operating conditions,numerical simulations were conducted by FLUENT,in which Reynolds averaged Navier-Stokes equations are discretized by finite volume method,and the pressure-velocity relation is coupled by SIMPLEC algorithm.According to the comparison and analysis of the simulated results,it was found that different viscosities have much influence on the performance of centrifugal pump.At the same flow rates,the head decreases with the viscosity increasing.The efficiency changes little near the design point,while changes great when far away from the design points.The simulation results show that the internal pressure and velocity distribution with different viscosities are almost similar with that of water.
2009 Vol. 27 (3): 168-172 [Abstract] ( 2235 ) [HTML 1KB] [ PDF 349KB] ( 1608 )
173 Design of temperature monitoring system for magnetic drive pump based on single-chip-microcomputer
Yuan Danqing,Kang Shibin,Cong Xiaoqing
 As most of failures in operating magnetic drive pump are closely related to the temperature of the containment shell,based on the analysis of the development of the monitoring technology in magnetic drive pump and considering the characteristic of airtight,the technology of single chip microcomputer was used to gather the real time temperature signal of the containment shell with temperature sensor,to magnify and correct the signal through converter,to transform the temperature analog quantity into digital quantity with A/D converter,to input the digital quantity to the CPU of the single chip microcomputer,and to monitor the temperature of containment shell of the operating machine.The overheat warning and shutdown protection are realized.The result shows that this system runs steadily and responds rapidly and correctly.This monitor system has practical value to diagnose and prevent failures of the magnetic drive pump,and to ensure the operation to be reliable and safe for the magnetic drive pump.
2009 Vol. 27 (3): 173-176 [Abstract] ( 2469 ) [HTML 1KB] [ PDF 278KB] ( 1694 )
177 Analysis of hydraulic performance and structure for Linjiaba Bulb Tubular Pump Set
Qin Zhongjian,Wu Jie,Zhang Rentian
Linjiaba Pump Station is the first station which adopts large-scale gear-driven bulb tubular pump set.In order to obtain optimum hydraulic performance of the pump set,its hydraulic loss was calculated by Computational Fluid Dynamics(CFD),and the results were compared with the model pump set test.The structures of bulb tubular pump supports,vane angle adjustment,main shaft seal apparatus,bearing arrangement,gearbox and synchronous motor were analyzed.The conclusion indicates that,the testing efficiency of the model pump set is 78%,the cavitation characteristic is fine at the net head(2.4 m) of pump station,and its hydraulic performances reach the index of the eastern route project of the South-to-North Water Diversion.The application of large-scale gear-driven bulb tubular pump set provides reference for type selection,design and manufacture of other pump stations of low lift and large flow capacity.
2009 Vol. 27 (3): 177-180 [Abstract] ( 1753 ) [HTML 1KB] [ PDF 260KB] ( 1409 )
181 Orthogonal experiment of refraction nozzle in vent wash exhaust hood
He Hongqin,Yuan Shouqi,Zhang Jie,Liu Xiaofan,Gu Weihua
The performance of nozzle has decisive influence on the oil cleaning of vent wash exhaust hood.In order to analyze the performance parameters of refraction nozzles,an orthogonal experiment was carried out.The relations with structural parameters,working conditions and hydraulic performance of refraction nozzle on vent wash exhaust hood were studied.An orthogonal array with five factors and four levels was selected in the experiment.The targets of range,spray area,water particle size were evaluated by using synthetical point system,and their relationships were found.The order of factors which affected spray performance were obtained through the orthogonal experiments: The sequence is working pressure,diameter of base circle,height of refractive face and angle of refractive face.The best working condition was that: the pressure of the vent wash exhaust hood was 0.3 MPa,the hole diameter and height of refractive face are both 1 mm,and the refraction angle for the nozzle was 120°,which gives the best spray uniformity,atomization and spray area.
2009 Vol. 27 (3): 181-183 [Abstract] ( 4221 ) [HTML 1KB] [ PDF 234KB] ( 1404 )
184 Design of wireless hydrological monitoring system based on ZigBee
Li Zhengming,Hou Jiajia,Pan Tianhong,Liao Kang
 Aimed at the monitoring requirements of wireless hydrological monitoring system as well as the hydrological monitoring network needs,the development status of hydrological monitoring system was analyzed,and application of Wireless Sensor Networks(WSN) to this system is proposed.The structure of hydrological monitoring system based on ZigBee and GPRS WSN,and topology of the ZigBee WSN for hydrological monitoring were presented.The method integrating singlechip and ARM microprocessor with CC2500 was applied in hardware design of network nodes,forming the software deve-lopment platform with transplanting the embedded operating system of TinyOS.The protocol stack of ZigBee was applied in software design of system.According to the test results,ZigBee network satisfies the communication distance demand of hydrological monitor,has high reliability and expandability,facilitates the realization of hydrological monitoring network,and provides a solution to realize the wireless hydrolo-gical monitor by combining the superiority of GPRS technology.
2009 Vol. 27 (3): 184-189 [Abstract] ( 2023 ) [HTML 1KB] [ PDF 433KB] ( 1863 )
190 Application of on-line monitoring system of urban drainage
Sheng Ping,Yu Yiping
The urban drainage monitoring method and the online monitoring system are discussed.The distributing status and monitoring request of draining water pipe network in Zhenjiang are introduced,including sewage pumping station,system composition,data processing of real-time monitor and automatic control system.The wireless transmission mode of monitoring data,the characteristics of GPRS wireless transmission system,the selection of equipment online monitoring instruments,and the real-time display principle of the monitoring system data are also introduced.Through the analysis,it shows that GPRS is particularly well suited to the communication between those data collected in monitoring points and center computer.The system of real-time monitor and the automatic control may realize the observation for sewage disposal data all day and find out the real-time changes of data,for example,pH value,the flux,and water level.The observation result indicate that the illegal discharge of sewage with strong acid and alkali into the urban sewage pipe network,the pumping station,as well as sewage treatment plant’s facility will affect the sewage treatment micro-organism activeness and reduce the sewage treatment ability.
2009 Vol. 27 (3): 190-195 [Abstract] ( 1876 ) [HTML 1KB] [ PDF 437KB] ( 2715 )
196 Numerical simulation on heat transfer characteristics for turbulent drag-reducing flow with additives
Li Changfeng,Xu Shiduo,Feng Xiaodong,Wang Yinghui
The reynolds stress model and the Cross viscosity equation have been adopted to simulate the turbulent flow and temperature fields of the dilute polyacrylamide(PAM) solution in a two-dimensional axisymmetric circular tube.The effect of flow velocity on drag reduction and heat transfer performance of drag-reducing fluid have been investigated systematically.The results indicate that the drag reduction(DR) and heat transfer reduction(HTR) of drag-reducing fluid increase with increasing flow velocity and approach the asymptotes,and HTR is greater than DR all the time.The comparison between Colburn factor and friction coefficient shows that Colburn analogy is not so much applicable to the drag-reducing fluid,especially for the low bulk flow Reynolds number conditions.  
2009 Vol. 27 (3): 196-199 [Abstract] ( 1722 ) [HTML 1KB] [ PDF 241KB] ( 1510 )
200 Simulation of flow field and temperature field for mechanical seal cavity
Sun Zegang,Huang Wenquan
 In oder to understand the distribution of temperature and pressure in a mechanical seal cavity,Fluent software was used to carry out a numerical simulation on temperature and pressure.Based on Navier-Stokes equations and the standard turbulent model,the temperature and flow fields for a mechanical seal ring were simulated.The results prove that the temperature in the mechanical seal cavity has little change and the temperature on the mechanical seal wall has greater change.The velocity near the meachanical seal wall is slower than that in cavity.The velocity distribution is linear and continual.The plot of pressure is nearly balanced at axis.There is a partical pressure change when the area of the cross section of the mechanical seal cavity changes suddenly.By comparing the calculated results with that from experiment,the error range is about 6% to 17.5%,which is coincident with the actual situation.It shows that numerical simulation can be carried out on the visual calculation for the invisible change in the flow field.
2009 Vol. 27 (3): 200-203 [Abstract] ( 2150 ) [HTML 1KB] [ PDF 285KB] ( 1980 )
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