弯掠翼叶轮内流二次涡系的计算机数值仿真  

Numerical simulation of internal secondary vortex in skew-swept impellers

作　　者：魏兵海[1] 金海[1] 吴克启[2] 

机构地区：[1]华中科技大学计算机科学与技术学院 [2]华中科技大学能源与动力工程学院

出　　处：《华中科技大学学报（自然科学版）》2003年第8期47-49,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目 (5 0 1 70 6 1 2 ) ;华中科技大学博士后科研专项基金项目 (AA1 831 0 7)

摘　　要：采用非交错网格下的曲率时间尺度K ε湍流模型和纳维 斯托克斯方程线求解 ,对宇宙航空用弯掠叶轮和基准叶轮叶道内部三维粘性速度场进行了数值仿真 ,分析了叶轮流道内部通道涡等复杂二次涡系结构的流谱特性及其对气动性能特别是旋转失速的作用机理 .研究表明 :弯掠叶轮流道内通道涡、刮擦涡有效卷吸翼顶边界层低能流体 ,抑制了翼顶部的流动分离和旋转失速 ,有利于失速裕度的扩大 .A K ε turbulent model improved with curvature timed scale and Navier Stokes equations solver under non staggered grids was employed to investigate the internal secondary vortex flow fields in a skew swept impeller for space aviation and its baseline impeller. The detailed characteristics of the secondary vortex distribution such as passage vortex distribution in the impellers were analyzed. The mechanisms of the skew swept airfoils controlling complex 3 D viscous velocity fields were discussed. The simulation results showed that the passage vortex in the skew swept rotor effectively absorbs low momentum fluid of boundary layer depressing flow separation and stall so as to sufficiently enlarge the stall margin. The numerical simulation results gave the computer aimed designers useful information to improve performance of the designed skew swept impeller.

关 键 词：动力学 曲率时间尺度 K-ε湍流模型 数值仿真 弯掠翼 二次涡系 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] V211.41[自动化与计算机技术—计算机科学与技术]