航空发动机进气畸变发生器畸变特性研究

Research on Distortion Characteristics of Aircraft Engine Inlet Distortion Generator

采用数值模拟的方法对某航空发动机进气畸变发生器进行了三维仿真分析,获取了不同流量下畸变发生器下游的畸变指数,并与试验结果进行了详细比较。结果显示数值模拟与试验的周向畸变指数IDC及径向畸变指数IDR存在一定差异,但分布趋势基本吻合,且IDR数值模拟与试验结果的吻合性较IDC更好;畸变发生器后流场发展显示从0.35D到0.65D处,高压区和低压区之间掺混非常强烈,在0.65D处之后至1.55D处,掺混的强度已经大幅减弱,在0.65D至1.55D区域,该畸变发生器可以产生较为稳定的畸变气流。

The numerical simulation was conducted on an aircraft engine inlet distortion generator,obtained distortion index under different flow condition,and a detailed comparison with the test results.It is showed that there are some differences in numerical simulation and experimental of distortion index,but the distortion index trends coincide.The flow field after distortion generator showed that there are strongly blend in the upstream region of 0.65D,the blend substantially weakened downstream of 0.65D.In the region of 0.65D to 1.55D,the distortion generator can generate stable distortion airflow.