【摘要】 通过实验、机理分析和数值模拟系统地分析了大气模式激光推进中抛物面型推力器的热力冲击问题。在分析激光推进中存在的4种热载荷(入射、辐射、透射和运流)的基础上,建立了相应的热力耦合动态计算方法。多脉冲推进的计算温升与实验结果吻合。计算表明,入射吸收和高温辐射是造成抛物面型激光推力器温升的主要原因,并预测推力器在熔化前首先发生拉伸破坏,揭示了激光推进中热力冲击破坏的机理和严重性。更多还原

【Abstract】 The experiment,mechanism analysis and numerical simulation were conducted to systemically explore impulsive thermomechanical response of parabolic laser thrusters for air-breathing mode laser propulsion.Based on analysis on the four thermal loads of incident,radiation,transmission and convection consisting in laser propulsion,the corresponding thermal mechanical coupling and dynamic computational method was established.The temperature rises of thrusters loaded by multi-pulses agree well with the experimental results.The computational results indicate that the incident absorption and high-temperature radiation are the prime reasons for the temperature rise of the parabolic laser thrusters.Researches show that the thrusters will go through the tensile failure before their melting,which open out the mechanism and the severity of the thermal-mechanical shock damage.更多还原