Numerical analysis of internal flow characteristic and pressure fluctuation of multistage vortex pump
BI Zhen1, LI Rennian1,2, LI Yibin1,2, XIAO Liqian1
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Fluid Machinery and Systems of Gansu Province, Lanzhou, Gansu 730050, China
Abstract:In order to reveal pressure fluctuation characteristics of internal fluid field′s structures in vortex pump, a multistage side pump with unshrouded impellers and closed runners was developed. Based on RNG k-ω turbulence model, SIMPLEC algorithm and structural grid, numerical simulations and experimental tests of the vortex pump were conducted. The external characteristic predictions indicated that the pump performance meet design requirements. Based on numerical simulation techniques, the internal flow field in the vortex pump was simulated. The results show that the vortex pump′s head has the tendency of plunge and at the same time blade power capacity becomes worse, blade pressurizing ability to liquid decreases gradually. Inside the blade runner of impeller inlet and outlet, degrees of velocity and turbulence energy distribution change sharply, velocity and turbulence energy distributions in other blade runners are very much alike. Inside the middle of impeller blade tip flow channel exists a low velocity region and the region becomes smaller and smaller with the flow rate increasing gradually. Inside the middle of impeller blade root flow channel exists a concentration zone of velocity gradient, in which the turbulence kinetic energy is larger, namely there exists a larger dissipation loss area in impeller blade root flow channel, and it is becoming smaller with the increasing of flow rate. Analysis of pressure fluctuation characteristics in vortex pump′s characteristic locations found that at different monitoring locations of impeller blades and closed runners, pressure fluctuation frequency characteristics are more obvious, where obvious hydraulic vibration and noise can be induced. The results reveal the impact mechanism of internal fields and performance of vortex pump, which provides a theoretical basis for vortex pump′s design.
毕祯, 李仁年,, 黎义斌,, 肖丽倩. 多级旋涡泵内部流动特性与压力脉动的数值分析[J]. 排灌机械工程学报, 2016, 34(10): 871-877.
BI Zhen, LI Rennian,, LI Yibin,, XIAO Liqian. Numerical analysis of internal flow characteristic and pressure fluctuation of multistage vortex pump. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(10): 871-877.
[1]武鹏,张菲茜,吴大转,等. 非等距叶片微型旋涡泵压力脉动特性研究[J]. 工程热物理学报,2015, 36(4):775-779. WU Peng, ZHANG Feixi, WU Dazhuan, et al. Study on pressure fluctuation of a micro vortex pump with non-uniform blade[J]. Journal of engineering thermophysics, 2015, 36(4):775-779.(in Chinese)[2]李华聪,王斌,李喜荣,等. 高速航空旋涡泵的设计研究[J]. 机械设计与制造,2009, 8(8): 30-32. LI Huacong, WANG Bin, LI Xirong, et al. Design and research of high speed vortex pump for aeroengine[J]. Machinery design and manufacture, 2009, 8(8): 30-32.(in Chinese)[3]袁丹青,王冠军,陈向阳,等. 旋涡泵的研究现状与展望[J]. 排灌机械,2008, 26(6): 63-68. YUAN Danqing, WANG Guanjun, CHEN Xiangyang, et al. Researcher status and prospect of vortex pump[J]. Drainage and irrigation machinery, 2008, 26(6): 63-68.(in Chinese)[4]SONG J W,ENGEDA A,CHUNG M K. A modified theory for the flow mechanism in regenerative flow pump[J]. Journal of power and energy,2003,217(3): 311-322.[5]孔繁余,周水清,王志强,等. 漩涡泵内部不稳定流场数值模拟[J]. 农业机械学报,2011, 42(1): 44-48. KONG Fanyu, ZHOU Shuiqing, WANG Zhiqiang, et al. Numerical simulation of internal unsteady flow in a vortex pump[J]. Transactions of the CSAM, 2011, 42(1): 44-48.(in Chinese)[6]谢鹏, 朱祖超, 偶国富,等. 小流量高扬程离心旋涡泵的设计与试验研究[J]. 流体机械, 2007, 35(8):1-4. XIE Peng, ZHU Zuchao, OU Guofu, et al. Design and experimental study of small-flow high-head centrifugal-vortex pump[J]. Fluid machinery, 2007,35(8):1-4.(in Chinese)[7]KUOPANPORTTI P, ANDERSON B P, MÖTTÖNEN M. Vortex pump for a Bose-Einstein condensate utilizing a time-averaged orbiting potential trap[J]. Physical review A, 2013, 52(87):453-457.[8]MIHALIC T, GUZOVIC Z, PREDIN A. Performances and flow analysis in the centrifugal vortex pump[J]. Journal of fluids engineering, 2013, 135(1):675-678.[9]QUAIL F J, SCANLON T, BAUMGARTNER A. Design study of a regenerative pump using one-dimensional and three-dimensional numerical techniques[J]. European journal of mechanics B fluids, 2012, 31(1):181-187.[10]QUAIL F J, SCANLON T, STRICKLAND M. Development of a regenerative pump impeller using rapid manufacturing techniques[J]. Rapid prototyping journal, 2010, 16(5): 337-344.[11]闻建龙,沙毅,王军锋,等. 微型自吸旋涡泵的实验研究[J]. 江苏大学学报(自然科学版),2002,23(4): 34-37. WEN Jianlong, SHA Yi, WANG Junfeng, et al. Experimental research of micro vortex pump[J]. Journal of Jiangsu University(natural science edition), 2002,23(4): 34-37.(in Chinese)[12]王春林,司艳雷,赵佰通,等. 旋流自吸泵内部湍流场大涡模拟[J].农业机械学报, 2009, 40(9): 68-72, 97. WANG Chunlin,, SI Yanlei, ZHAO Baitong, et al. Large eddy simulation on interior flow field of rotational flow self-priming pump[J]. Transactions of the CSAM, 2009, 40(9): 68-72, 97.(in Chinese)[13]金玉珍,谢鹏,胡旭东.小流量高扬程离心旋涡泵气液混输扬程的分析[J]. 浙江理工大学学报, 2007, 24(4): 420-423. JIN Yuzhen, XIE Peng, HU Xudong. The head analysis on gas-liquid two-phase mixture flow of small-flow high-head centrifugal-vortex pump[J].Journal of Zhejiang Sci-tech University, 2007, 24(4):420-423.(in Chinese)[14]COLE D, NEAL J S, CONNOLLY M R, et al. Vortex pumps in the crossing lattices regime of highly anisotropic layered super-conductors[J]. Physica C superconductivity, 2006, 437(4): 52-56.