|
|
|
| Performance computations of centrifugal pump with large blade discharge angle for handling viscous oils |
| Li Wenguang |
| (School of Energy and Power Engineering,Lanzhou Technological University,Lanzhou,Gansu 730050,China) |
|
|
|
|
Abstract Hydraulic performance of centrifugal pump with a large blade discharge angle of 44°was investigated numerically with FLUENT when both water and viscous oils were used as working fluids.Attention was paid on the effect of liquid viscosity on the pump performance through examining several critical variables,such as impeller theoretical head,slip factor,hydraulic efficiency and hydraulic loss coefficient etc.Moreover,the computed pump head and efficiency were compared with the experimental data.The causes for the "sudden-rising head effect" and the peak onset on the impeller theoretical head curve at a low flow rate were clarified.It shows that a partial agreement between CFD simulations and experiments is achieved for the pump head and efficiency.Although the "sudden-rising head effect" onset is well predicted,unlike that in the experiments,it cannot persist in a wide range of liquid viscosity.The substantial interaction between volute and impeller at a low flow rate gives rise to the peak occurrence in the impeller theoretical head curves.The increased blade discharge angle results in the increasing hydraulic losses in the volute at the whole working condition and in the impeller at the low flow rate,but decreasing losses in the impeller at the high flow rate.
|
|
Received: 28 July 2008
Published: 30 September 2009
|
|
|
|
| [1]李文广.离心泵输送粘油的性能计算[J].排灌机械,2008,26(4):1-7.Li Wenguang.Performance computations of centrifugal pump handling viscous oils[J].Drainage and Irrigation Machinery,2008,26(4):1-7.(in Chinese)[2]李文广,胡泽明.离心高粘油泵性能试验[J].流体机械,1997,25(2):3-8.Li Wenguang,Hu Zeming.Experiments on performance of centrifugal highly viscous oil pump[J].Fluid Machinery,1997,25(2):3-8.(in Chinese)[3]李文广,胡泽明.离心泵叶轮内部二维紊流时均流动测量[J].水泵技术,1996(4):18-29.Li Wenguang,Hu Zeming.Measurements of time averaged two dimensional turbulent flow in impeller of centrifugal pump[J].Pump Technology,1996 (4):18-29.(in Chinese)[4]李文广,胡泽明.离心泵蜗壳断面内的二维紊流时均流动测量[J].水泵技术,1995(3):3-10.Li Wenguang,Hu Zeming.Measurements of time averaged two dimensional turbulent flow in volute of centrifugal pump[J].Pump Technology,1995 (3):3-10.(in Chinese)[5]李文广,薛敦松,朱宏武.离心泵蜗壳内部高粘油时均流动的LDV测量[J].工程热物理学报,1997,18(1):61-64.Li Wenguang,Xue Dunsong,Zhu Hongwu.LDV measurements of time averaged viscous oil flow in volute of centrifugal pump[J].Journal of Engineering Thermophysics,1997,18(1):61-64.(in Chinese)[6]李文广.离心泵叶轮内部清水流动试验研究[J].水利学报,1998(11):29-32.Li Wenguang.Experimental study on water flow in impeller of centrifugal pump[J].Journal of Hydraulics,1998 (11):29-32.(in Chinese)[7]李文广,薛敦松.离心泵叶轮内部粘油流动激光测速计测量[J].机械工程学报,1998,34(6):97-101.Li Wenguang,Xue Dunsong.LDV measurement of internal flow in impeller of centrifugal pump while handling viscous oils[J].Chinese Journal of Mechanical Engineering,1998,34(6):97-101.(in Chinese)[8]Li Wenguang.Effects of viscosity on the performance of a centrifugal oil pump and the flow pattern in the impeller[J].International Journal of Heat and Fluid Flow,2000,21(2):271-275.[9]李文广,薛敦松.离心泵输送粘油时叶轮内部流动测量[J].机械工程学报,2000,36(6):33-36.Li Wenguang,Xue Dunsong.Measurement of internal flow in impeller of centrifugal pump while handling viscous oils[J].Chinese Journal of Mechanical Engineering,2000,36(6):33-36.(in Chinese)[10]李文广,薛敦松.粘度对离心泵蜗壳内部流动的影响[J].农业机械学报,2003,34(2):30-33.Li Wenguang,Xue Dunsong.Effect of viscosity on internal flow in volute of centrifugal pump[J].Transactions of the Chinese Society for Agricultural Machinery,2003,34(2):30-33.(in Chinese) |
|
|
|
