不同湍流模型对插板式进气畸变的数值模拟

Numerical Simulation of Inlet Distortion with Interceptor with Different Turbulence Models

为得出一种较为准确的湍流模型,应用三种湍流模型对插板式进气畸变进行数值模拟,通过与畸变实验实测数据的对比,研究不同湍流模型在插板式进气畸变计算中的预测能力。不同湍流模型计算出的出口流场畸变不同,重整化群k-ε模型得出高压区范围较大,S-A模型过渡区域范围大。结果表明:插板高度为畸变发生器内径的48%时,低压区范围角与实验值较为吻合,插板高度为畸变发生器内径的20%时,低压区范围角偏小。畸变指数的计算值以可实现化k-ε模型最为准确。

In order to get a more accurate turbulence model,three turbulence models have been adopted to simulate inlet distortion with interceptor. Compared with experimental data,the precision of each model to simulate inlet distortion with interceptor was investigated. The flow field distortion computed by each model is different.The area of high-pressure is large by using renormalization group k-ε model and the area of transition section is large by using Spalart-Allmaras model. It is shown that the angle range of low-pressure has better agreement with experimental data when the interceptor height is 48% of the inner diameter of the distortion generator.However,when the interceptor height is 20% of the inner diameter,the angle range of low-pressure is smaller than experimental data. The value of distortion index is more accurate by using realizable k-ε model.