降压熄火过程复合推进剂燃速的测试研究

激光光斑法是激光阴影技术的实际应用,它是文献1]中激光燃速仪法的发展,但本质有很大差别。激光器发出的激光束照在燃烧的药条上,随药条燃烧,燃面下移逐渐增多的过激光量由一光电池接收并转换为电压信号。如果在激光束上加一整形片,使这种转换具线性关系,并且适当选择和调整放大和记录元件,使在要求的测试精度范围内,每个环节信号转换都具有线性关系。因而,组成一个线性系统。 

MEASUREMENT OF TRANSIENT BURNING RATES OF COMPOSITE PROPELLANTS IN FAST DEPRESSURIZATION

A continuous laser beam is transmitted through the burning surface of a propellant strand and converted in to voltage signal by photocell.The voltage differentiation with respect to time is proportional to the burning rate of the propellant strand.The experimental results show that the burning rate at the start of depressurization remains unchanged,and then decreased with very low frequency oscillation.During the whole depressurization process the transient burning rate is not higher than the quasi steady burning rate at the corresponding pressure and oscillates around quasi steady burning rate,except for a short time after the start of the depressurization.