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发展了一种高分辨率和灵敏度的彩色纹影技术,研究高超声速条件下Edney Ⅳ型激波相互作用。解决了制作彩色滤光片的关键技术,采用特制的彩色滤光片代替了传统纹影系统中的刀口,高速彩色相机曝光时间60μs,帧频6242fps。将光源限制在0.5mm×20mm的狭缝内以提高系统灵敏度。实验在马赫数为5的激波风洞内进行,Edney Ⅳ型激波相互作用由15°斜劈和20mm直径钝头体产生,来流静压和静温分别为1800Pa和100K。数值模拟采用迎风格式求解三维RANS方程。实验得到了清晰的彩色纹影照片,细致地呈现了Edney Ⅳ型激波相互作用的波系结构和马赫数为1.2的超声速射流。数值计算与实验结果很好地吻合,共同揭示了Edney Ⅳ型激波相互作用机制和钝头体表面局部高压区域的形成原因。
A high-resolution and sensitive color profiling technique has been developed to study the Edney type IV shock interaction under hypersonic conditions. Solve the key technology of making color filters, using a special color filter instead of the traditional Wenjing system blade, high-speed color camera exposure time 60μs, frame rate 6242fps. The light source is limited to 0.5mm × 20mm slit to improve system sensitivity. Experiments were carried out in a shockwave wind tunnel with a Mach number of 5. The Edney type IV shock interaction was caused by a 15 ° wedge and a 20 mm diameter blunt body with a flow static pressure and static temperature of 1800 Pa and 100 K respectively. Numerical simulation solves the three-dimensional RANS equation with windward format. Experiments have been clear color stripe photos, detailed presentation of the Edney type IV shock wave structure and Mach number supersonic jet 1.2. The numerical results agree well with the experimental results, revealing the interaction mechanism of Edney IV shock and the formation of local high pressure area on the blunt body surface.