Experiments were carried out to assess the influence of spanwise spacing between adjacent orifices of an air-jet vortex-generator (AJVG) array on their separation-control effectiveness. The array was applied to a 24° compression-ramp-induced shock-wave / turbulent boundary-layer interaction at \(M_{\infty } = 2.52\) and \(Re_{\theta } = 8225\). Three spanwise oriented AJVG arrays of small, intermediate, and large jet spacings were studied. Their influence on the mean-flow organisation and turbulence quantities was assessed using flow visualisations and planar particle image velocimetry across multiple measurement planes. The streamwise vortices induced by the AJVGs incited different control effects depending on the degree of interaction between adjacent vortices. The array with intermediate spacing achieved the most favourable effects with reductions in separation length and area of about \(25\%\) and \(52\%\), respectively. This reduction was brought about by the formation of stable, interacting streamwise-elongated coherent vortices downstream of jet injection and the associated entrainment of high-momentum fluid. The smallest jet spacing incites vortex interactions to adverse strength, breaking up the coherent structures and even increasing separation. The AJVGs with the largest spacing display characteristics similar to single jets in crossflow, with only a local modification of the separation region. Turbulent quantities are amplified both by the jets and the separation-inducing shock; AJVG control reduces the amplification across the shock-wave/boundary-layer interaction and the intermediate jet spacing is most effective also here.

进行了实验以评估喷气涡流发生器 (AJVG) 阵列的相邻孔之间的翼展间距对其分离控制效果的影响。该阵列应用于\(M_{\infty } = 2.52\)和\(Re_{\theta } = 8225\)处的 24° 压缩斜坡诱发的冲击波/湍流边界层相互作用. 研究了三个小、中和大射流间距的翼展方向 AJVG 阵列。使用跨多个测量平面的流动可视化和平面粒子图像测速评估它们对平均流动组织和湍流量的影响。由 AJVG 引起的流向涡流会根据相邻涡流之间的相互作用程度引发不同的控制效果。具有中间间距的阵列取得了最有利的效果，分离长度和面积减少了约\(25\%\)和\(52\%\)， 分别。这种减少是由于在射流喷射下游形成稳定的、相互作用的流向拉长的相干涡流以及相关的高动量流体夹带。最小的射流间距会引发涡流相互作用以产生不利的强度，破坏连贯的结构，甚至增加分离。具有最大间距的 AJVG 显示出类似于横流中的单射流的特性，只是对分离区域进行了局部修改。湍流量被射流和引起分离的冲击放大；AJVG 控制减少了冲击波/边界层相互作用的放大，中间射流间距在这里也是最有效的。