动态射流控制附面层的分离

CONTROL OF SEPARATION BY DYNAMIC AIR JETS

本文介绍了利用动态涡流器的流向涡和垂直于型面振动的射流所产生的横向涡的联合作用来控制大攻角下翼型表面附面层分离的实验。实验结果表明 :两种涡的作用能有效地同时推迟附面层分离和提前其再附着 ,使分离区大大缩小 ,附面层内的速度分布相应变得极为饱满。

Results about the effects on separation of an aerofoil at high angle of attack by air jets producing streamwise vortex of alternating circulation and spanwise vortex fluctuating up and down above the surface are given.Combined effects of the above two kinds of jets are also investigated.The actions of the mentioned jets both cause the retardation of separation and earlier reattachment.The suitable design and arrangement of the jets gain reduction of 76% separation bubble length.