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针对亚声速来流条件下吸气式纳秒激光推进的机理,通过Fluent流体仿真软件,数值模拟不同来流马赫数条件下推进器内外流场的演化过程,分析来流速度对推进性能的影响。结果表明:低速条件下,空气来流强度小,对推进器和激光冲击波的影响较小,冲击波近似自由向外传播,与推进器作用较为充分,使得冲量耦合系数较高;随着亚声速来流的增大,自由空气来流强度增大,推进器所受阻力增大,并抑制冲击波自由传播,加速冲击波耗散,缩短冲击波的有效做功时间,导致冲量耦合系数快速下降。
Aiming at the mechanism of aspirated nanosecond laser propulsion under subsonic flow, the evolution process of flow field inside and outside the propeller under different Mach Mach numbers was simulated by Fluent fluid simulation software, and the influence of flow velocity on propulsion performance was analyzed . The results show that under low speed, the intensity of the air flow is small, the impact on the propeller and the laser shock wave is small, the shock wave propagates almost freely, and the effect of the propeller is more sufficient, making the impulse coupling coefficient higher. With the subsonic speed The increase of flow, the increase of free air inflow, the increase of impeller resistance, the suppression of the free propagation of shock wave, the acceleration of shock wave dissipation and the shortening of the effective work time of shock wave lead to the rapid decline of impulse coupling coefficient.