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针对含硼推进剂固体火箭冲压发动机内硼颗粒聚团的着火过程开展了系统研究,考虑硼颗粒聚团内部气相扩散及颗粒聚团与周围环境的传热传质过程,建立了一维硼颗粒聚团着火模型,详细分析了环境总压、环境气体温度、氧气摩尔分数、聚团半径、聚团孔隙率以及硼颗粒粒径对硼颗粒聚团的着火温度和着火延迟时间的影响规律。结果表明:硼颗粒聚团能够在比单颗粒硼着火温度更低的环境温度下实现着火,且着火温度随聚团半径、氧气摩尔分数的增加而降低,随环境总压、聚团孔隙率以及硼颗粒粒径的增加而增大;硼颗粒聚团着火延迟时间随环境气体温度、氧气摩尔分数和颗粒聚团孔隙率的增加而减小,随硼颗粒粒径的增加而增大。在较高的环境总压下,硼颗粒聚团的着火延迟时间随环境总压增加而增大。
Aiming at the ignition process of boron particle agglomeration in boron rocket propellant solid rocket ramjet engine, a systematic study was made on the ignition process of boron particle agglomeration in boron rocket propellant ramjet engine. Considering the internal gas phase diffusion and the heat and mass transfer process between particle agglomeration and the surrounding environment, The influence of total ambient pressure, ambient gas temperature, oxygen mole fraction, agglomeration radius, agglomeration porosity and boron particle size on the ignition temperature and ignition delay time of agglomeration of boron particles were analyzed in detail. The results show that the agglomeration of boron particles can ignite at a lower ambient temperature than the ignition temperature of single particle boron, and the ignition temperature decreases with the increase of agglomeration radius and oxygen mole fraction. With the total ambient pressure, agglomeration porosity and Boron particles increased with increasing particle size. The ignition delay of agglomeration of boron particles decreased with the increase of ambient gas temperature, oxygen mole fraction and porosity of agglomerate, and increased with the increase of particle size of boron particles. At higher ambient total pressure, the ignition delay of agglomeration of boron particles increases with the increase of total ambient pressure.