固体推进剂裂纹对流燃烧和扩展的研究分析

AN INVESTIGATION ON CRACK PROPAGATION AND CONVECTIVE COMBUSTION IN SOLID PROPELLANTS

关键词:  固体推进剂  推进剂燃烧  裂纹扩展  爆燃  爆轰

Key words:  Solid propellant  propellant combustion  Crack propagation  Deflagration  Detonation

摘要:

评述了固体推进剂裂纹对流燃烧及扩展的研究，讨论了推进剂裂纹对流燃烧的流场与裂纹的变形、扩展及其之间存在着强耦合作用。初步揭示了在不同的燃烧室压力率下单一裂纹扩展的不同模式，指出裂纹腔内火焰的离散传播、裂纹尖端的压力突升以及对流燃烧条件下的裂纹失稳扩展极可能诱导产生DDT过程，提出了需进一步深入研究的问题。

Abstract:

In solid rocket motors, crack propagation and convective combustion in solid propellants have influence on the interior-ballistic parameters seriously. Investigated results indicate that strong coupling exists among crack deformation, propagation and convective combustion dependent on the achievements of convective combustion, crack dynamic propagation and consideration of the coupling. On the one-dimensional assumption, flame spreading and parameters of convective combustion are studied in details. Crack deformation and propagation is investigated preliminary under convective combustion condition. Experimental research reveals various propagation patterns of single crack under various chamber pressure rates. It was often pointed out in literatures that DDT may be induced by discontinuous flame spreading in cracks, abrupt pressurization at crack tip and unstable crack propagation under convective combustion.