张吉礼,马良栋,任晓东
ZHANG Ji-li1,MA Liang-dong1,REN Xiao-dong2(1.Dalian University of Technology

• 1:大连理工大学
• 2:杭州市建筑设计研究院有限公司

摘要(Abstract)：

应用FLUENT软件对Ghost离心叶轮内部湍流流动进行了数值研究,其中湍流模型采用雷诺应力模型(RSM),转子和定子的耦合采用混合平面模型(MP)。计算结果与Johnson的试验结果基本一致,表明了RSM能较好的预测离心叶轮内的湍流流动。分析了离心叶轮内部的湍流流动特性,表明边界层内的二次流对低能流体的输运,使叶轮出口形成"尾迹-射流"现象,同时尾迹区的存在造成能量的损失,且尾迹区位置取决于无量纲数Rossby数。
The internal turbulent flow in Ghost centrifugal impeller is investigated numerically by CFD software FLUENT.And the Reynolds stress model(RSM) is used to simulate turbulent flow.The mixing plane model(MP) is provided to couple the rotor and stator.The simulated results are accordance with Johnson's experimental results,which show that the turbulent flow in centrifugal impeller can be predicted well by RSM.The internal turbulent flow distribution in different cross section of the impeller is analyzed.The results show that the low energy fluid is transported by secondary flow in the boundary layer,which results in jet-wake flow phenomena at outlet of the impeller.And the jet-wake flow leads to energy loss,whose location depends on Rossby number.

关键词(KeyWords)： 离心叶轮;湍流;二次流;数值模拟
centrifugal impeller;turbulent flow;secondary flow;numerical simulation

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50578049);; 大连市优秀青年科技人才基金项目(2008J23JH024)

作者(Author): 张吉礼,马良栋,任晓东
ZHANG Ji-li1,MA Liang-dong1,REN Xiao-dong2(1.Dalian University of Technology

参考文献(References)：

• [1]Eckardt D.Detailed FlowInvestigations Within a HighSpeed Centrifugal Compressor Impeller[J].ASMEJournal of Fluids Engineering,1976,98:390-402.
• [2]Johnson M W,Moore J.The Development of WakeFlow in a Centrifugal Impeller[J].ASME Journal ofEngineering for Power,1980,102(2):382-390.
• [3]Johnson MW,Moore J.The Influence of FlowRate onthe Wake in a Centrifugal Impeller[J].ASME Journalof Engineering for Power,1983,105(3):33-39.
• [4]Krain H.Swirling Impeller Flow[J].ASME Journal ofTurbomachinery,1988,110:122-128.
• [5]Hathaway MD,Chriss R M,Wood J R.Experimentaland Computational Investigation of the NASA Low-Speed Centrifugal Impeller Field Flow[J].ASMEJournal of Turbomachinery,1993,115:527-542.
• [6]Moore J,Moore J G.Three-Dimensional Viscous FlowCalculations for Assessing the Thermodynamic Perform-ance of Centrifugal Compressors-Study of the EckardCompressor[J].ASME Journal of Engineering forPower,1981,103:367-372.
• [7]刘立军,徐忠.离心叶轮内部三维湍流流动的数值分析[J].工程热物理学报,1996,17(3):296-300.
• [8]赖焕新,康顺,吴克启.离心式叶轮内部湍流及出口“射流-尾迹”结构的成因分析[J].推进技术,2000,21(1):45-48.
• [9]蒋兆麟,罗晟.流体机械叶轮内二次流及尾迹的发展[J].华中科技大学学报,2001,29(1):7-10.
• [10]李魏,王国强,刘立军.离心叶轮内三维紊流流动的数值模拟[J].上海交通大学学报,2000,34(1):143-147.
• [11]刘正先.离心叶轮内三维湍流流场的数值计算与实验比较[J].流体机械,2000,28(4):9-12.
• [12]Rubber P E,Lee K D.Patched Coordinate Systems[J].Applied Mathematics and Computation,1982.235-252.
• [13]Johnson M W.Secondary Flows in Rotating Bends[J].ASME Journal of Engineering for Power,1978,100(4):553-560.