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高超声速飞行器面临较高的波阻问题。为揭示基于脉冲激光能量沉积的减阻机理,并为激光减阻新方法提供科学指导依据,在马赫数为5.0的高超声速激波风洞内开展了单脉冲激光与弓形激波相互作用过程的实验研究。结合数值模拟结果,揭示了单脉冲激光的减阻机理。通过数值模拟研究了高重频激光与弓形激波相互作用的减阻机理。结果表明:在脉冲激光引致的激波与弓形激波相互作用的特定时刻,钝头体表面附近形成了低压低密度通道,这是钝头体阻力降低的原因。高重频激光引致的激波串可在高超声速流场中追赶合并形成锥形的准静态波,准静态波与弓形激波相互作用增大了弓形激波的脱体距离,弓形激波后压力和温度重新分布,形成相对稳定的流场结构,减阻率达到19%。
Hypersonic vehicles face higher wave resistance issues. In order to reveal the drag reduction mechanism based on pulsed laser energy deposition and to provide a scientific basis for a new laser drag reduction method, the interaction between single-pulse laser and arcuate shock wave is carried out in hypersonic shock wave tunnel with Mach number 5.0 Experimental Study. Combined with the numerical simulation results, the drag reduction mechanism of single pulse laser is revealed. The drag reduction mechanism of interaction between high-frequency laser and arcuate shock wave was studied by numerical simulation. The results show that low pressure and low density channels are formed in the vicinity of the surface of the blunt body at a specific moment when the shock wave caused by the pulsed laser interacts with the bow shock, which is the reason for the decrease of the resistance of the blunt body. High-frequency laser-induced shock wave train can chase and merge in the hypersonic flow field to form a cone quasi-static wave. The interaction between quasi-static wave and arcuate shock wave increases the arcuate shock off-distance, Pressure and temperature redistribution, the formation of a relatively stable flow field structure, drag reduction rate of 19%.