Understanding the flow characteristics over a double compression ramp is crucial for high-speed vehicle design. Leading edge bluntness is a key factor influencing the formation of a separation region on a double compression ramp flow. In the present study, the effect of bluntness on a double compression ramp is investigated experimentally at a nominal Mach number of 4. The test model has 13° and 40° inclinations with respect to the freestream. Five different levels of leading-edge radius, varying from 0.0 to 2.0 mm, were subjected to supersonic wind tunnel tests. Shadowgraph and infrared thermography techniques were employed to visualize the flow features of the double ramp model. Measurements of surface heat-transfer along the centerline of the test model were obtained from the acquired infrared images. It is shown that the leading-edge radius alters the separation characteristics as well as the surface heat-transfer. Possible reasons for such flow characteristics are discussed.

了解双压缩坡道上的流动特性对于高速车辆设计至关重要。前缘钝度是影响双压缩斜面流上分离区域形成的关键因素。在本研究中，以标称马赫数为4的实验研究了钝性对双压缩坡道的影响。测试模型相对于自由流具有13°和40°的倾斜度。超音速风洞测试对五种不同级别的前缘半径（范围从0.0到2.0 mm）进行了测试。阴影图和红外热成像技术被用来可视化双斜坡模型的流动特征。从所获取的红外图像获得沿着测试模型中心线的表面热传递的测量值。结果表明，前沿半径改变了分离特性以及表面传热。讨论了这种流动特性的可能原因。