激光能量注入控制Ⅳ型激波干扰的数值研究

Numerical investigation of type Ⅳ shock interaction controlled by laser energy deposition

激光能量注入可以控制Ⅳ型激波干扰,有效地减小钝头体压力载荷.基于有限体积法和分区结构网格划分的高分辨率数值方法,在来流马赫数为3.45的条件下,计算了单脉冲激光能量注入和连续激光能量注入对Ⅳ型激波干扰的影响.研究结果表明：单脉冲激光能量注入后一个较短时期内（50～60 μs）,钝头体表面压力突然升高,随后压力有一个较为明显的下降过程,然后恢复原状态;当注入的连续激光能量较小时,钝头体表面压力略微增大,随着注入能量增大,钝头体表面压力峰值减小;在注入能量到一定程度时,钝头体表面压力峰值减小已不明显.

The injection of laser energy willchange the wave structure and effectively reduce the pressure load on the blunt body surface. A high resolution numerical method based on finite volume method and domain decomposition of structural grid is used to compute the influence of laser single pulse energy and laser continuous energy injected into type IV shock interaction at Maeh number 3.45. The result shows that the pressure on the blunt body surface increases slightly when the injection laser energy with a single pulse is in a relatively short period（50 us to 60 us ）, then it declines quickly, and it restores to the original state at last. The peak of the pressure on the blunt body surface increases slightly after the injection of a little laser energy with continuous deposition, and then decreases quickly with the increase of the laser energy deposition. It is remarkable that the peak of the pressure decreases slowly and tends to be a constant value even the laser energy deposition increases again.