无叶扩压器失速的三维可压缩流模型

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (11): 1725-1730.

无叶扩压器失速的三维可压缩流模型

沈枫1，竺晓程1，刘鹏寅1，杜朝辉1，陈化2

（1. 上海交通大学机械与动力工程学院，上海 200240； 2. 霍尼韦尔涡轮技术有限公司，上海 201203）

收稿日期:2010-11-12 出版日期:2011-11-30 发布日期:2011-11-30
基金资助:
国家自然科学基金面上项目(51076101)

A Three-Dimensional Compressible Flow Model on Vaneless Diffuser Stall

(1.School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Honeywell Turbo Technologies Ltd, Shanghai 201203, China)

Received:2010-11-12 Online:2011-11-30 Published:2011-11-30

摘要/Abstract

摘要： 为了研究离心压缩机系统内无叶扩压器的失速问题，提出了一种三维可压缩模型.采用奇异值分裂（SVD）方法求解离散后的三维可压缩流欧拉方程，得到了无叶扩压器失速时的临界流量系数和失速团相对转速.研究显示，在无叶扩压器较长的情况下，入口马赫数对临界流量系数和失速团相对转速都有重要影响.此外，无叶扩压器临界流量系数还受到无叶扩压器出入口半径比、扩压器入口平均流动的轴向分布以及叶片后弯的影响.实验比较显示，三维模型的预测结果相比二维模型更为准确.

关键词: 离心压缩机, 无叶扩压器, 失速, 三维模型, 可压缩流动

Abstract: A three-dimensional compressible flow model was presented to study the occurrence of rotating waves in vaneless diffusers of centrifugal compressors. Solutions to the discrete 3D Euler equations for compressible flow were obtained via singular value decomposition (SVD) method. Critical inlet mass flow rate of vaneless diffuser stall and relative rotating speed of stall cell were calculated. The effects of inlet Mach number were studied and the results show that both critical inlet mass flow rate and rotating wave speed vary with inlet Mach number especially when the diffuser is long. In addition, critical inlet mass flow rate and rotating wave speed are also influenced by diffuser outlet/inlet radius ratio, departure from axial uniform distribution of the undisturbed radial velocity at the diffuser inlet, and impeller back swept angle. Finally, a comparison with experimental results in open literature was made, and the results of 3D model show better agreement than those of 2D model.

Key words: centrifugal compressor, vaneless diffuser, stall, 3D modeling, compressible flow

中图分类号:

U463.1

沈枫1，竺晓程1，刘鹏寅1，杜朝辉1，陈化2. 无叶扩压器失速的三维可压缩流模型[J]. 上海交通大学学报（自然版）, 2011, 45(11): 1725-1730.

参考文献

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收稿日期：20110204

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