Micro-ramps for shock train control were investigated experimentally in a Mach 1.85 supersonic isolator flow using three device heights. A mechanical flap was mounted downstream and linearly choked, forcing the shock train to travel upstream of the micro-ramp from the exit. Wall static pressure measurements along the primary and corner regions obtained a more complete pressure distribution. Detailed structures of the shock train were recorded using schlieren visualization with circular, horizontal, vertical, and color knife edges. The results show that the wake and wave structures generated by the micro-ramp control the shock train. The taller the device, the stronger the wake and wave structures, and the greater the control. The wake and wave structures shorten or eliminate the Mach stem in the shock train leading edge, causing modification of shocks downstream from pseudonormal to oblique, inhibiting the thickening of the boundary layer that results from shock impingement, slowing down the contraction of the supersonic core flow, and allowing more high total pressure fluid to develop downstream. The wake structure was found to promote the oscillation and upstream motion of the shock train. The wave structure can restrain shock train oscillation and upstream propagation of the downstream adverse pressure gradient, enhancing the resistance backpressure of the flowfield downstream of the micro-ramp.

使用三种设备高度在 1.85 马赫的超音速隔离流中实验研究了用于冲击序列控制的微斜坡。一个机械襟翼安装在下游并线性阻塞，迫使激波列车从出口向上游移动。沿主要和角落区域的壁静压测量获得了更完整的压力分布。使用带有圆形、水平、垂直和彩色刀刃的纹影可视化记录了冲击序列的详细结构。结果表明，微坡道产生的尾流和波浪结构控制着激波列。设备越高，尾流和波浪结构越强，控制力也越大。尾流和波浪结构缩短或消除了激波列前缘中的马赫杆，导致下游激波从伪法向转变为斜波，抑制激波撞击引起的边界层增厚，减慢超音速核心流的收缩，并允许更多的高总压流体向下游发展。发现尾流结构促进了激波列的振荡和上游运动。波浪结构可以抑制激波列振荡和下游逆压力梯度的上游传播，增强微坡道下游流场的阻力背压。发现尾流结构促进了激波列的振荡和上游运动。波浪结构可以抑制激波列振荡和下游逆压力梯度的上游传播，增强微坡道下游流场的阻力背压。发现尾流结构促进了激波列的振荡和上游运动。波浪结构可以抑制激波列振荡和下游逆压力梯度的上游传播，增强微坡道下游流场的阻力背压。