部分进气燃气涡轮机叶轮流场数值模拟

Numerical Simulation on Inner Flow Field of Gas Turbine with Partial Inlet Flow

基于求解雷诺平均的NAVIER-STOKES方程组,对部分进气燃气涡轮机叶轮内部流场进行全3D粘性定常数值模拟,研究了涡轮机叶轮内部流场精细结构。研究结果表明,本文所使用的数值模拟方法能够较好地捕捉部分进气燃气涡轮机叶轮内部存在的各种复杂流动结构;叶轮进口燃气超音速,导致叶轮入口产生激波,激波与边界层干涉,造成边界层分离,引起流动损失增大,从而影响叶片的载荷分布和涡轮效率;叶轮通道内部流动呈强3D特性,存在各种旋涡结构;部分进气设计和叶轮高速旋转,使叶轮受到强烈的交变力冲击,对叶片应力分布产生不利影响。该方法为部分进气燃气涡轮机设计及工程应用提供参考。

A three-dimensional,viscous,steady CFD analysis is performed for investigating gas turbine flow field with partial inlet flow,by solving RANS-Navier-Stocks equations and RNG k-？ turbulence model.The inner flow mathemat-ics of turbine is studied in detail.The results show that the inner complex flow characteristics of the turbine can be pre-dicted with the present simulation method;the inlet shock wave and flow separation occur in turbine because of the su-personic inlet flow,leading to worse load distribution on blade and turbine efficiency;strong three-dimensional vortex structures occur in the inner flow of turbine because of the partial inlet flow design and the high speed rotation of turbine;the turbine blades work under the alternating impact force,which imposes a bad effect on the blade stress distribution.This study may offer a reference for the design and engineering application of the gas tur-bine with partial inlet flow.