|
|
|
| Effects of diffuser vane on mixedflow pumps performance |
| BING Hao1, CAO Shu-Liang1, TAN Lei2, LU Li3 |
| (1.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; 2.State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; 3.Hydraulic Machinery Department, China Institute of Water Resources and Hydropower Research, Beijing 100038, China) |
|
|
|
|
Abstract A series of vaneddiffusers, which are with various vane inlet angles, vane angle distributions along streamline, leading and trailing edge positions, were designed for a mixedflow pump impeller by using the pointbypoint integration method that was applied to generate the threedimensional camber of vane on the streamlines determined by employing an iterative calculation between two kinds of relative stream surfaces. The vane thickening and leading and trailing edges smoothing were conducted on a plane of conformal mapping.3D turbulent flow fields inside the mixedflow pump with the same impeller but different diffusers were simulated by solving the Reynolds timeaveraged N-S equations and the standard k-ε turbulence equations based on SIMPLE algorithm, and the pump hydraulic efficiencies were predicted, consequently, the correlations of both the vane wrap angle and hydraulic efficiency to different design parameters were obtained. In addition, effects of various design parameters on the mixedflow pump performance were analyzed by means of relative velocity, static pressure and total pressure distributions in the inlet and outlet to the diffusers.The results showed that the diffuser vane inlet angle has the strongest influence on the performance and a reasonably selected inlet angle can reduce the shock loss. The vane angle distributions along streamlines should be selected by considering the control of wrap angle to reduce the hydraulic friction loss in diffuser. The leading edge and trailing edge positions should be selected with the consideration of static pressure recovery ability and hydraulic friction loss across diffuser.
|
|
Received: 26 October 2011
Published: 30 March 2012
|
|
|
|
| ［1］潘中永, 倪永燕, 袁寿其, 等. 斜流泵研究进展［J］. 流体机械, 2009, 37(9): 37-41.Pan Zhongyong, Ni Yongyan, Yuan Shouqi, et al. Overview for research on mixed flow pumps with vaned diffuser［J］. Fluid Machinery, 2009, 37(9): 37-41. (in Chinese)［2］Bonaiuti D, Zangeneh M, Aartojarvi R, et al. Parametric design of a waterjet pump by means of inverse design, CFD calculations and experimental analyses［J］. Journal of Fluids Engineering, 2010, 132(3): 031104［3］Oh H W, Yoon E S. Hydrodynamically detailed performance analysis of a mixedflow waterjet pump using computational fluid dynamics［J］. Journal of Mechanical Engineering Science, 2008, 222(9):1861-1867.［4］Kim S, Choi Y S, Lee K Y. Design optimization of mixedflow pump impellers and diffusers in a fixed meridional shape［C］／／Proceedings of the 10th Asian International Conference on Fluid Machinery, 2010: 287-296.［5］Kim J H, Ahn H J, Kim K Y. Highefficiency design of a mixed-flow pump［J］. Science China Technological Sciences, 2010, 53(1): 24-27.［6］陆森林，曾发林，刘红光，等.消声器中的高次波及其对消声性能的影响［J］.江苏大学学报：自然科学版，2007，28（5）：385-388.Lu Senlin, Zeng Falin, Liu Hongguang, et al. Effects of higher order mode waves on muffler performance［J］. Journal of Jiangsu University: Natural Science Edition, 2007, 28(5):385-388.(in Chinese)［7］秦杰, 徐士鸣. 导叶结构对核主泵性能的影响［J］. 发电设备, 2010(5): 315-318.Qin Jie, Xu Shiming. Influence of guide vane structure on performance of reactor coolant pumps［J］. Power Equipment, 2010(5): 315-318. (in Chinese)［8］李忠, 杨敏官, 王晓坤. 导叶对轴流泵性能影响的试验［J］. 排灌机械, 2009, 27(1): 15-18.Li Zhong, Yang Minguan, Wang Xiaokun. Experimental study of guide vane influence on performance of axial-flow pump［J］. Drainage and Irrigation Machinery, 2009, 27(1): 15-18. (in Chinese)［9］张勤昭, 曹树良, 陆力. 高比转数混流泵导叶设计计算［J］. 农业机械学报, 2008, 39(2): 73-76.Zhang Qinzhao, Cao Shuliang, Lu Li. Research on the guide vane design of high specific speed mixedflow pump［J］. Transactions of the Chinese Society for Agricultural Machinery, 2008, 39(2): 73-76. (in Chinese)［10］邴浩, 曹树良, 谭磊. 混流泵叶轮设计正反问题迭代方法［J］. 排灌机械工程学报, 2011, 29(4): 277-281.Bing Hao, Cao Shuliang, Tan Lei. Iteration method of direct inverse problem of mixedflow pump impeller design［J］. Journal of Drainage and Irrigation Machinery Engineering, 2011, 29(4): 277-281. (in Chinese) |
|
|
|
