|
|
|
| Experimental study on flow of mixed flow pumps |
| Lu Jinling, Guo Pengcheng, Feng Jianjun, Deng Jia, Luo Xingqi |
| Institute of Water Resources and Hydro-Electric Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China |
|
|
|
|
Abstract Mixed flow pumps are widely used in many fields,and the performance of a whole pump is affected by the flow in the impeller to a great extend. To make clear the flow phenomena in mixed flow impellers under design and off-design flow rate conditions, a mixed flow unshrouded impeller was ma-nufactured, and the flow in the impeller at design and off-design flow rates was measured by particle image velocimetry(PIV). In the experiment, the volute was specially designed and manufactured by transparent material. The distribution of time-average relatively velocity from the experiment shows that velocity near blade pressure surface at design flow rate decreases and then increases from inlet to outlet of the impeller, when the velocity near blade suction surface increases and then decreases. The velocity near the suction surface decreases from hub to casing, and the minimal velocity appears near the casing and suction surface. Near the impeller outlet, the relative velocity near blade pressure surface varies a little alone the span direction; and back-flow phenomena can be found at passage outlet near casing and mid-span sections at partial flow rates. To clarify the effect of asymmetrical volute geometry on the velocity distribution, the flow in passages at different impeller relative positions to the volute tongue was tested and the results show that the velocity distributions in different passages are similar.
|
|
Received: 07 December 2012
|
|
|
|
| [1]邴浩,曹树良,谭磊,等.速度矩分布规律的参数化描述及对混流泵性能的影响[J].农业工程学报,2012,28(13):100-105. Bing Hao,Cao Shuliang,Tan Lei,et al. Parameterization of velocity moment distribution and its effects on performance of mixed-flow pump[J]. Transaction of the CSAE,2012,28(13):100-105.(in Chinese)[2]Bing Hao,Cao Shuliang,Tan Lei,et al. Effects of meri-dional flow passage shape on hydraulic performance of mixed-flow pump impellers[J]. Chinese Journal of Mechanical Engineering,2013,26(3):469-475.[3]靳栓宝,王永生,常书平,等.混流泵内流场压力脉动特性研究[J].农业机械学报,2013,44(3):64-68. Jin Shuanbao,Wang Yongsheng,Chang Shuping,et al. Pressure fluctuation of interior flow in mixed-flow pump[J].Transaction of the Chinese Society for Agricultural Machinery,2013,44(3):64-68.(in Chinese)[4]朱荣生,胡自强,付强.双叶片泵内压力脉动的数值模拟[J].农业工程学报,2010,26(6):129-134. Zhu Rongsheng, Hu Ziqiang,Fu Qiang.Numerical simulation of pressure fluction in double-blade pump[J].Transactions of the CSAE,2010,26(6):129-134.(in Chinese)[5]胡芳芳,陈涛,吴大转,等.导叶式混流泵汽蚀振动噪声试验研究[J].排灌机械工程学报,2013,31(12):1021-1024. Hu Fangfang,Chen Tao,Wu Dazhuan,et al.Experiment study of cavitation induced vibration and noise of guide vane mixed flow pump[J].Journal of Drainage and Irrigation Machinery Engineering,2013,31(12):1021-1024.(in Chinese)[6]王勇,刘厚林,袁寿其,等. 离心泵非设计工况空化振动噪声的实验测试[J]. 农业工程学报,2012,28(2):35-38. Wang Yong,Liu Houlin,Yuan Shouqi,et al. Experimental testing on cavitation vibration and noise of centrifugal pump under off-design conditions[J]. Transactions of the CSAE,2012,28(2):35-38.(in Chinese)[7]袁寿其,何有世,袁建平,等. 带分流叶片的离心泵叶轮内部流场的PIV测量与数值模拟[J]. 机械工程学报,2006,42(5):60-63. Yuan Shouqi,He Youshi,Yuan Jianping,et al. PIV measurements and numerical simulations of flow in centrifugal pump impellers with splitting vanes[J]. Chinese Journal of Mechanical Engineering,2006,42(5):60-63.(in Chinese)[8]Wu Yulin,Liu Shuhong,Yuan Huijing,et al.PIV mea-surement on internal instantaneous flows of a centrifugal pump[J].Science China Technological Sciences,2011,54(2):270-276.[9]杨华,汤方平,刘超,等.离心泵叶轮内二维PIV非定常流动测量[J].农业机械学报,2011,42(7):56-60. Yang Hua,Tang Fangping,Liu Chao,et al. 2-D PIV measurements of unsteady flow field inside the rotating impeller of centrifugal pump[J].Transaction of the Chinese Society for Agricultural Machinery,2011,42(7):56-60.(in Chinese)[10]Inoue Y,Nagahara T.Application of PIV for the flow field measurement in a mixed-flow pump[C]//Procee-dings of the 26th IAHR Symposiumon Hydraulic Machi-nery and Systems,2012.[11]Li Yalin,Yuan Shouqi,Tang Yue,et al.Motion of tracer particles in a centrifugal pump and its tracking characteristics[J].Journal of Hydrodynamics,2012,24(5):785-793.[12]Wuibaut G,Bois G,Dupont P,et al. PIV measurements in the impeller and the vaneless diffuser of a radial flow pump in design and off-design operating conditions[J].Journal of Fluids Engineering,2002,124(3):791-797.[13]Yang H,Xu H R,Liu C.Flow measurements in a model centrifugal pump by 3-D PIV[C]//Proceedings of the 26th IAHR Symposiumon Hydraulic Machinery and Systems.Beijing,China:[s.n.],2012,15(6):7-15. |
|
|
|
