气压对吸气式激光推进冲量耦合系数的影响
Effects of air pressure on impulse coupling coefficient in air breathing laser propusion
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摘要: 保持CO2激光的单脉冲能量为61.4~64.6 J，采用高精度冲击摆系统进行了不同气压下吸气模式激光推进冲量耦合系数的实验测试，分析了对应的高度特性。结果表明：气压为2.8×104～1×105 Pa，即距离地面0～10 km时，冲量耦合系数大约3.5×10-4 N·s·J-1，上下波动幅度低于5%；气压低于2.8×104 Pa，即高度大于10 km时，冲量耦合系数呈二次曲线显著下降；当气压降至1×103 Pa，即距离地面约31 km高度时，耦合系数仅为9.7×10-5 N·s·J-1。Abstract: Keeping the single pulse energy of CO2 laser constant, the impulse coupling coefficients in air-breathing laser propulsion are measured at different air pressure with a high precision impact pendulum system and the altitude characteristics are analyzed. The results indicate that the impulse coupling coefficient is about 3.5×10-4 N·s·J-1 with a fluctuation lower than 5%, when the air pressure ranges from 2.8×104 Pa to 1×105 Pa and the altitude from 0 to 10 km. When the air pressure is lower than 2.8×104 Pa and the altitude higher than 10 km, the impulse coupling coefficients drop apparently in terms of conic. At the pressure of 1×103 Pa and altitude of 31 km, the impulse coupling coefficient is only 9.7×10-5 N·s·J-1.
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