基于模型的偏心叶轮前侧盖板泄漏流稳态特性分析.pdf

30 卷 5 期 Vol.30 No.5 工 程 力 学 2013 年 5 月 May 2013 ENGINEERING MECHANICS 298 文章编号：1000-4750(2013)05-0298-07 基于 模型的偏心叶轮前侧盖板 泄漏流稳态特性分析 袁振伟，王海娟，张 妍，张 军 (郑州大学化工与能源学院，河南，郑州 450001) 摘 要：通过数值计算分析了叶轮偏心情况下前侧盖板泄漏流流体的稳态特性。基于一种 bulk-flow 模型建立了 由 3 个非线性偏微分方程组成的流体控制方程。运用有限差分方法和交错网格得到离散化的控制方程，利用 SIMPLE 算法来完成对离散化控制方程的求解。根据计算结果给出了给定条件下叶轮前侧盖板泄漏流流体的稳态 压力分布和速度分布，并分析了叶轮前侧盖板与蜗壳间间隙和叶轮偏心率对叶轮前侧盖板泄漏流流体的稳态压力 分布和速度分布的影响。分析结果表 ：二者对叶轮前侧盖板泄漏流流体的稳态特性具有明显影响。 关键词：离心叶轮；前侧盖板；偏心率；bulk-flow 模型；稳态特性 中图分类号：TH311; O351 文献标志码：A doi: 10.6052/j.issn.1000-4750.20 11.09.0590 A BULK-FLOW ANALYSIS OF STEADY-STATE CHARACTERISTICS OF LEAKAGE FLOW ON AN ECCENTRIC IMPELLER FRONT SHROUD YUAN Zhen-wei , WANG Hai-juan , ZHANG Yan , ZHANG Jun (School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan 450001, China) Abstract: The steady-state characteristics of the leakage flow on an eccentric impeller front shroud are analyzed by numerical calculations. The governing equations, which consist of three nonlinear partial differential equations, are established based on a bulk-flow model. The finite difference method and staggered grid are used to discretize the equations. The SIMPLE algorithm is used to solve the discretized equations. The steady-state pressure and velocity distributions of the leakage flow are displayed, and the influences of the gap between the housing and impeller shroud and the impeller eccentricity on the distributions are analyzed, according to numerical results. It is concluded that the two factors have significant effects on the steady-state characteristics of the leakage flow. Key words: centrif