固体药柱燃烧断裂边界一维流场特性

CHARACTERISTICS OF 1 D FLOW FIELDS ON THE BOUNDARY OF COMBUSTION FRACTURE IN SOLID PROPELLANT

关键词:  固体推进剂  推进剂燃烧  侵蚀燃烧裂纹  火焰传播

Key words:  Solid propellant  Propellant combustion  Erosive burning crack  Flame propagation

摘要:

以发动机燃烧室增压为条件，详细模拟了固体药柱燃烧断裂边界一维流场的特性。高温燃气在燃烧室增压驱动下注入药柱裂纹，在裂纹内形成压力波和火焰锋的传播过程。压力波前和封闭的裂纹顶端会产生拍击作用，使得裂纹顶端的压力迅速增加，进而在燃烧室增压率增大的方向上，裂纹顶端相继出现火焰减速传播、压力突升、超前点火和火焰加速传播等现象。这就找到了国内外学者在一维假设下发现的各现象之间的内在联系，并描述了四种不同的火焰传播曲线。

Abstract:

The characteristics of 1 D flow fields were simulated on the boundary of combustion fracture in solid propellants on the condition of pressurization in chamber The high temperature combustion gas was drived into crack by the pressurization,so that there were spreading processes of pressure wave and combustion flame When the pressure wave front got to the close tip of the crack,there must be a shock which would make the pressure increasing rapidly at the tip port Therefor,in the direction of pressurization rate inceasing,there must be the phenomena of flame spreading deceleration、abrupt pressurization、prior ignition and flame spreading acceleration one after another at the crack tip So the internal relations are established among the phenomena which were described in literatures,and four kinds of combustion flame spreading curves are described in this paper