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针对不同初始铝粉粒度的含铝复合推进剂,对其燃烧产物粒子阻尼特性和铝粒子分布燃烧响应特性进行了试验研究。试验结果表明:粒子阻尼的大小取决于流场中的凝相燃烧产物粒径分布和振荡频率,与推进剂中铝粉初始粒度基本无关;粒子阻尼预估方面,采用单一粒径预估的阻尼值与实际测量的阻尼值相比,仍存在一定的误差(>10%),需要进一步改进;分布燃烧响应方面,在同一振荡频率范围内,分布燃烧响应特性与复合推进剂中初始铝粉粒度有关,即初始铝粉粒度越大,在燃烧过程中产生的分布燃烧增益越大,这对于发动机燃烧的稳定性是十分不利的。
Aiming at the different initial aluminum powder particle size of aluminum-containing composite propellant, the particle damping characteristics of combustion products and the combustion response characteristics of aluminum particles were studied. The experimental results show that the size of particle damping depends on the particle size distribution and oscillation frequency of the condensed phase combustion products in the flow field and is basically independent of the initial particle size of the aluminum powder in the propellant. For the particle damping estimation, There is still some error (> 10%) compared with the actual measured damping value, which needs further improvement. In the aspect of distributed combustion response, in the same oscillation frequency range, the distribution of combustion response and initial aluminum particle size in composite propellant , Ie, the larger the initial aluminum particle size, the larger the combustion gain in the distribution during combustion, which is very unfavorable for the combustion stability of the engine.