尖脊(Caret)进气道地面气动特性试验研究

Experimental investigation on gas dynamic performance of caret inlet under takeoff condition

在地面静止状态下试验研究了尖脊进气道气动特性以及唇口厚度对进气道性能影响 ,给出了进气道各侧壁沿程静压分布及其出口总压分布图谱 ,研究了进气口流动特点及其对出口总压畸变流场的影响。试验表明 ,Caret进气道进口存在一大一小的反向旋转涡 ,该旋涡的作用使得进气道高、低压区均旋转了 90°以上。进口下唇口和外唇口厚度对地面静止状态下的进气道总压恢复系数和总压畸变指数有较大的影响 ,为进气唇口厚度的选择提供了依据。

An experimental investigation was carried out for caret inlet′s gas dynamic performance as well as the effect of inlet cowl lip thickness on the performance under takeoff condition The flow characteristics of the inlet and their influence on inlet exit distortion of total pressure were analyzed by means of static pressure distribution along each side of the inlet wall and total pressure contour plots of inlet exit It is shown that there are two counter rotating vortices at inside corner(weaker) and outside corner(stronger) separately on the bottom cowl lip.As a result , the high and low total pressure domains were rotated more than 90 deg from inlet face to exit face of caret inlet It is also shown that the thickness of caret inlet outside and bottom side cowl lips has great influence on its total pressure recovery and total pressure distortion The experimental results may be used in practical design of the caret inlet