带中心支板侧压进气道流场特性研究

应用表面油流和压力测量实验技术,辅助计算模拟手段,考察了两种不同形式的中心支板对侧压式进气道流场特性的影响.结果表明:进气道内部由于侧壁斜激波和支板诱发的斜激波的汇合引起了侧壁和顶板边界层的大尺度分离现象,使进气道性能受到了极大影响.后掠支板后移避免了支板和侧壁诱导斜激波的汇合,分离现象相对较弱,有利于进气道性能的提高;支板前掠可以提高流量捕获,但导致边界层分离加剧,对减少总压损失不利.

Investigation on flow pattern of sidewall compression scramjet inlet with single central strut

Flow feature in a sidewall compression scramjet inlet with central strut was investigated using surface oil flow visualization,pressure measurements and numerical simulation.Two types of sidewall scramjet inlets were studied with a back swept strut and a forward swept strut respectively.Appropriate strut location can avoid the interaction of shocks induced by side wall and strut,and generate smaller boundary layer separation,which is favorable for improving the inlet performance.The inlet with forward strut is good for increasing capture ratio,but increases the total pressure loss for larger boundary layer separation.