复合推进剂中铝粉粒度对分布燃烧响应和粒子阻尼特性影响

Effects of Different Aluminum Particle Sizes in Composite Propellant on Distributed Combustion Response and Particle Damping

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。

According to the aluminized composite propellants with different initial particle sizes,the characteristics of the particle damping of condensed phase combustion products and the distribution combustion response were researched. The result shows that,particle damping is dependent on the particle size distribution of the condensed phase combustion products and the oscillation frequency,which is reasonably insensitive to the initial aluminum particle sizes. On the aspect of estimating the particle damping,the particle damping computed using the mono-sized particles were different from the value in the experiment,with the relative error more than10 percent. Thus,further improvement on the prediction method is needed. On the aspect of distributed combustion response,the distributed combustion response is sensitive to the initial aluminum particle sizes in the same oscillation frequency,that is,the bigger the sizes of the initial aluminum particles are,the higher the combustion driven in the combustion,which is not good in solid rocket motor from a combustion instability point of view.