高超声速波系结构的彩色纹影显示技术

针对高超声速流场波系结构复杂、激波相互作用强、激波强度差别大等特点，发展了非侵入式、高灵敏度的彩色纹影流场显示技术，结合彩色滤光片设计技术和高速摄影技术，将彩色纹影系统的空间分辨率提高至0.1 mm 量级，时间分辨率达到1 s量级。在高超声速激波风洞中分别研究了斜激波相互作用产生的正规反射和马赫反射激波结构，以及斜激波与弓形激波相互作用产生的IV 型激波干扰，得到了清晰的彩色纹影照片，细致展现了待测流场的复杂结构，证明了该彩色纹影技术能够为高超声速流场诊断提供有力的技术支撑。

Color schlieren for hypersonic shock wave structures diagnosis

A non-invaded and high resolution color schlieren system was developed to diagnose the hypersonic flow field with complex shock wave structures, intensive shock interactions and different shock intensity. The key technique of color schlieren system is the color filter. A high sensitive color filter with 6 regions is designed. High speed color camera and synchronization technique are employed to meet the needs of high speed photography. Space and time resolution were brought up to 0.1mm and 1s, respectively. Experiments were performed in hypersonic shock tunnel with Mach 5.0 and 6.0. Regular reflection and Mach reflection generated by interaction of oblique shocks, and type IV shock interaction generated by oblique shock and bow shock were detected. Clear color schlieren images were obtained at the 3 conditions. The complex structures of the 3 kinds of shock interactions are disclosed, which proves that the color schlieren system was efficient and reliable. And it also supplies an alternate method in the diagnostics of hypersonic flow field.