含硼富燃料推进剂燃烧机理研究

Investigation on combustion mechanism of fuel-rich propellant based on boron

关键词:  贫氧  富燃料固体推进剂  硼化物推进剂  燃速  燃烧波

Key words:  Oxygen-poor  Fuel-rich propellant  Boron compound propellant  Burning rate  Combustion wave

摘要:

分析了AP包覆硼对含硼富燃料推进剂低压燃烧的影响。通过微热电偶测温和火焰单幅照相技术分别测试含硼富燃料推进剂燃烧波温度分布及燃烧火焰结构; 根据气相温度变化的趋势, 把该推进剂的气相区燃烧又分为三个子区, 并给出了三个子区的厚度, 分析了各区温度变化趋势不同的原因。用扫描电镜对熄火表面形貌进行观察, 并通过能谱仪进行局部元素分析; 该推进剂中断燃烧熄火纵向剖面的实验表明, 该推进剂的燃烧表面存在“沉积层”; 分析认为该“沉积层”由硼、积炭和少量的三氧化二硼组成, 且基本惰性。燃面上“沉积层”的厚度与温度分布曲线中燃面上气相区的厚度基本一致, 认为该推进剂的气相反应在燃面上的惰性“沉积层”中进行。

Abstract:

The difference of the combustion characteristic between two propellants which contain boron coated with and without AP was compared and analyzed. The combustion wave temperature profiles and the flame structures of fuel-rich propellant based on boron were measured by using W-Re micro-thermal couple and flame photo technique. The gaseous phase of the propellant burning was divided three subsections according to the trend of temperature change in gaseous phase, and the thickness of every subsection is given. The cause of different temperature change trend in different subsection was analyzed. The surface appearance and element distribution of extinguished samples were analyzed by JMS-5800 SEM. The experimental results of cutaway view of quenched surface photo of the fuel-rich propellant based on boron showed: there was “sediment” covered on the combustion surface and it was suggested that “sediment” is reactionless. The thickness of “sediment” on the combustion surface and the thickness of gaseous phased on the combustion surface are about equivalent.Thus the gaseous reaction undergo in the “sediment”.