论文部分内容阅读
点火延迟是脉冲推力器设计中需要考虑的重要因素之一。为研究点火延迟对自激式脉冲推力器的性能影响,以HAN基(Hydroxylammonium Nitrate)单组元推进剂为例,建立自激式脉冲推力器工作过程的仿真模型,分析了点火延迟时间的变化对推力器的压强、流量、推力及平均比冲的影响规律。结果表明,点火延迟会强化脉冲推力器的压强爬升过程,随着点火延迟时间的增大,一个脉冲循环中的推进剂燃烧持续时间和整个脉冲周期均会明显缩短,同时挤压腔压强峰值和燃烧室压强峰值以及推力器的平均推力水平也会显著升高,但点火延迟的变化基本不会影响脉冲周期内的平均比冲。点火延迟提供了一条调节脉冲工作特性的可能途径,研究点火延迟特性对自激式脉冲推力器的探索与应用具有重要的指导意义。
Ignition delay is one of the important factors to be considered in the design of pulse thrusters. In order to study the influence of ignition delay on the performance of self-excited pulsed thruster, a simulation model of the working process of self-excited pulsed thruster was established with Hydroxylammonium Nitrate single component propellant as an example. The variation of ignition delay time The influence of thruster pressure, flow, thrust and average specific impulse. The results show that the ignition delay will intensify the pressure rise of the impulse thruster. As the ignition delay time increases, the combustion duration of the propellant in one impulse cycle and the entire impulse duration will be significantly shortened, The peak pressure of the combustion chamber and the average thrust level of the thruster also increased significantly, but the change of the ignition delay basically did not affect the average specific impulse in the pulse period. Ignition delay provides a possible way to adjust the operating characteristics of the pulse. Studying the characteristics of ignition delay has an important guiding significance for the exploration and application of the self-excited pulse thruster.