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固液火箭发动机中,内弹道的计算、流场与性能分析等都需要确定燃料表面的退移速度,常规的热重分析、差热分析因升温速率太慢,与发动机环境的高升温速率差别很大,得到的热解速率误差大。采用了热板实验装置测量高升温速率环境下的固体燃料退移速率。采用高速摄影和超声波传感器进行动态测量,对比了摄影测量和超声波测量的结果,得到了超声波测量得到了热解过程中的退移速率与低密度聚乙烯表面温度的关系。
Solid-liquid rocket engine, the internal trajectory calculation, flow field and performance analysis, etc. need to determine the fuel surface of the migration speed, conventional thermal analysis, differential thermal analysis due to the heating rate is too slow, high temperature heating rate difference with the engine environment Large, large pyrolysis rate error. A hot plate experiment was used to measure the rate of solid fuel evacuation under high heating rate conditions. Using high-speed photography and ultrasonic sensor for dynamic measurement, the results of photogrammetry and ultrasonic measurement were contrasted. The relationship between the rate of retrogradation and the surface temperature of low-density polyethylene was obtained by ultrasonic measurement.