格栅对进气道的气动性能和电磁散射特性的影响

EFFECT OF HONEYCOMB ON AERODYNAMIC PERFORMANCE AND RADAR CROSS SECTION OF INLET

给出了在进气道内加装格栅对进气道的气动性能和电磁散射特性的影响。结果表明，格栅明显地降低了Ｓ弯进气道出口二次旋流，且使原始单涡旋流消失，出口流场畸变度减小，进气道的雷达散射截面值显著降低，但同时也降低了进气道出口截面上的平均总压恢复系数。还给出了格栅几何尺寸的影响，及设计中如何选择格栅尺寸。

A honeycomb is utilized to reduce the radar cross section (RCS) value of inlets. The effects of the honeycomb on the total pressure distortion, the swirl of secondary flow and total pressure recovery of the S shaped inlet are described. The experimental results show that the honeycomb with stealthy material can greatly reduce the RCS value of inlets and change the property of tha radar cross section. The honeycomb also can improve the aerodynamic performance of inlets. It reduces the degree of total pressure distortion and the swirl of secondary flow, and it can even make the bulk swirl disappear.