侧喷孔分布对多股燃气射流在充液室中扩展特性的影响

EFFECTS OF THE DISTRIBUTION OF LATERAL ORIFICES ON EXPANSION OF MULTIPLE COMBUSTION GAS JETS IN WATER-FILLED CHAMBER

该文对火药燃烧形成的多股高压燃气射流从模拟弹头头部喷入柱形充液室的过程进行了数值研究。采用雷诺平均N-S方程结合可实现k-ε湍流模型来描述单个中心泰勒空腔和多个侧面泰勒空腔在受限液体环境中的扩展过程,同时分析了侧面喷孔个数对燃气扩展的影响。数值结果表明,减少侧面喷孔的个数,泰勒空腔的剖面形状并未发生明显变化,相邻侧面泰勒空腔的汇聚过程变慢,泰勒空腔充满充液室的时间增加。侧面喷孔的个数减少,泰勒空腔内部的静压趋于稳定,流场内径向截面的平均总压降低。

The injection of multiple high-pressure combustion gas jets which is developed by the combustion of powder in a cylindrical water-filled chamber is numerically studied. The Reynolds average Navier-Stokes equations and the k-ε realizable turbulent model are adopted to describe the expansion of a single central Taylor cavity and several lateral Taylor cavities in this limited water environment. The effects of the number of lateral orifices on the gas expansion are discussed. The numerical results show that, when the number of lateral orifices decreases, the shape of Taylor cavities on the section in axial direction has no significant change, but the convergence of adjacent lateral Taylor cavities appears later and the time of Taylor cavities to fill the chamber increases. With a decreasing number of lateral orifices, the static pressure in Taylor cavity tends to be stable and the average total pressure on the section in radial direction decreases.