攻角动态变化的侧压式进气道风洞实验

在Ma=3.85的风洞中,对一个设计Ma=6起动Ma=2.5的侧压式进气道完成了攻角从0°→8°→0°的连续吹风实验.实验结果表明:0°攻角时进气道顺利起动,当攻角增大到5.7°时,进气道出现不起动;之后在8°到0°的变化过程中,在5.4°时又恢复了起动.另外,随着攻角的增加,流量系数在起动状态下缓慢减小,在不起动状态下急剧减小.实验中还进行了攻角0°→4°→0°的动态连续吹风实验,进气道全程都处于起动状态.

Wind tunnel experiment of sidewall compression inlet with adjustable attack angle

This paper conducted a wind tunnel experiment at Ma=3.85,during which a continual blowing process was finished at the sidewall compression inlet with designed Ma=6 and starting Ma=2.5,when attack angle changed from 0° to 8°,and again to 0°.Experimental results show that,in the case of Ma=3.85,attack angle=0°,the inlet starts smoothly,and the pressure distribution is consistent with numerical simulation to a large degree.In the dynamic process of attack angle changing from 0° to 8°,when it increases to 5.7°,the inlet fails to start.In the dynamic process of attack angle changing from 8° to 0°,when it decreases to 5.4°,the inlet succeeds in startup.What's more,with the increase of attack angle,the flow coefficient decreases when the inlet starts,and it decreases sharply when the inlet doesn't start.When the attack angle changes from 0° to 4°,and again to 0°,the inlet starts in the entire process.