Establishment of the scaling laws for laser ignition and combustion of B/KNO3 pyrotechnics and their application to laser ignition thrusters

为实现高性能激光点火推力器，实验得到了B/KNO_3在不同低压下的燃烧速率。燃烧速率在背景压力< 0.01 MPa时基本不变，随背景压力的增大而增大。空间用B/KNO_3推进剂的压力指数变化很大，在真空条件下为0，在常压条件下几乎为1，这对B/KNO_3推进剂的点火和燃烧性能有重要影响。这些数据被纳入激光点火模型，得到了与实验相当一致的结果。

The burning rates of B/KNO_3 under different low pressures were experimentally obtained to realize high performance laser ignition thrusters. The meas-ured burning rate was almost constant with the background pressure less than 0.01 MPa and it increased with increasing background pressure. The pressure exponent has a wide variation between 0 (in vacuum) and almost 1 (at atmospheric pressure), which has a sig-nificant impact on the ignition and combustion performance of B/KNO_3 propellant for space use. These data were incorporated into a laser ignition model and yielded fairly good agreement with experiments.