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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.
In order to explore the influence of the dynamic changes of down-angle under different frequencies on the starting performance of the air intake, a wind tunnel test was carried out with Ma = 3.85 lateral pressure inlet with different frequency, = 2.5 lateral pressure inlet to complete the angle of attack from 0 ° → 8.15 ° → 0 °, the frequency of 0.8,1.6,3.2 Hz and 6 Hz several blowing test results show that: the four frequency states The intake passage can undergo a start-up-no-start-restart process during one oscillation cycle; as the frequency increases, the attack angle does not increase slowly during the first cycle of oscillation, and at a later cycle Inability to change the attack angle sharply reduced.