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在实验和数值分析IV型激波干扰特性及其对飞行器表面压力和热流影响的基础上,提出采用脉冲激光能量控制IV型激波干扰的方法,以降低飞行器波阻、驻点压力和热流。采用实验和数值方法,研究了100m J单脉冲激光能量与马赫5.0条件下IV型激波干扰的相互作用过程,揭示了单脉冲激光能量控制IV型激波干扰的机理。数值研究了频率为150k Hz的激光能量注入后,激光空气锥的形成及其与IV型激波干扰的相互作用过程,得到了钝头体表面压力、热流和波阻的演化过程。结果表明,沉积高重频的激光沉积方式可以利用相对较少的激光能量形成比较稳定的准静态波结构,进而利用准静态波与IV型激波干扰的相互作用将高能区脱离钝头体表面。在马赫数为5.0的流场中沉积频率为150k Hz、单脉冲能量为5m J的激光能量可使峰值压力、热流和波阻分别降低40%,33%和23%。
Based on the experimental and numerical analysis of the type IV shock disturbance and its influence on the aircraft surface pressure and heat flow, a method using pulsed laser energy to control the type IV shock wave is proposed to reduce the aircraft resistance, stagnation pressure and heat flow. The interaction between the single-pulse 100m J laser energy and the type IV shock wave interference under Mach 5.0 is studied by means of experiments and numerical methods. The mechanism of the single-pulse laser energy control type IV shock wave disturbance is studied. The formation of the laser air cone and the interaction with the type IV shock wave were investigated numerically. The evolution of surface pressure, heat flow and wave resistance of the blunt body was obtained. The results show that the laser deposition method with high repetition rate can form relatively stable quasi-static wave structure with a relatively small amount of laser energy and then use the interaction of the quasi-static wave and the type IV shock wave to separate the high energy region from the surface of the blunt body . Laser energy with a single pulse energy of 5 mJ deposited at 150 k Hz in a flow field with a Mach number of 5.0 reduced peak pressure, heat flow and wave resistance by 40%, 33% and 23%, respectively.