攻角动态变化对侧压式进气道起动特性影响的风洞试验

为了探寻不同频率下攻角动态变化对进气道起动性能的影响,进行了攻角以不同频率调节的侧压式进气道Ma=3.85的风洞试验.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°→8.15°→0°,频率分别为0.8,1.6,3.2 Hz和6 Hz的数次吹风试验.试验结果表明:四种频率状态下进气道在一个振荡周期中都能经历一个起动—不起动—再起动的过程;随着频率的增加,在进入振荡的第1个周期内不起动攻角缓慢增大,而在之后的周期性变化中不起动攻角急剧减小. 

Wind tunnel experiment of the influence of dynamic change of attack angle on start property of sidewall compression scramjet inlet

In order to explore how the change of attack angle at different frequencies influences the start property of inlet,this paper conducted a wind tunnel experiment for the sidewall compression scramjet inlet with Mach number 3.85 and attack angle at different frequencies.The sidewall compression scramjet inlet,with designed Mach number 6 and start Mach number 2.5,was subject to several flow tests,when attack angle changed from 0°to 8.15° again down to 0°,with the frequency at 0.8,1.6,3.2 Hz and 6 Hz,respectively.Results show that at each frequency,the inlet in a periodic oscillation succeeds to go through a start-unstart-restart process.With the increase of frequency,attack angle gradually goes up in the first periodic oscillation,and sharply goes down in the proceeding periodic oscillation.