无隔道进气道RCS特性实验研究

选定无隔道进气道口面参数,在不同的极化方式下对无隔道进气道及皮托式进气道进行了电磁散射特性实验研究。比较了2种进气道的雷达散射截面(RCS),得到了各个口面参数对无隔道进气道RCS的影响规律。研究结果表明:无隔道进气道是1种低RCS进气道;鼓包相对来流附面层的高度略低于1.2时最好,唇罩锯齿角在120°~135°最佳,唇罩内切角在60°时较好,鼓包相对唇口的位置在0.7~0.8时较好。终端开口与转动风扇的比较表明,无隔道进气道的后向散射主要来源于外罩唇口的电磁波散射。

Experimental Research on RCS of Bump Inlet

The Radar Cross Section (RCS) of bump inlet with alterable mouth parameters and a Pitot inlet have been investigated by experiment.The paper compares RCS of the bump inlet with RCS of the Pitot inlet and finds out the influence of mouth parameters on RCS of bump inlet.The results show that:①the bump inlet is a sort of inlets with low RCS; ②the ratio of the height of the bump to the thickness of inflow boundary layer should be appreciably less than 1.2; ③the angle between two top edges of the lip can be chosen between 120°and 135°; ④a 60°angle between the side edge of lip and horizon is optimal; ⑤the location of the bump relative to the lip would be best set between 0.7 and 0.8.The comparison results of the bump inlet with opening terminal and with rotating fan at the outlet indicate that the electromagnetic scattering comes mostly from the mouth of inlet .