点火管传火孔射流场数值计算

Calculation of Jet Flow from a Vent Holes in a Center-Core Igniter

中心点火管传火孔射流场直接影响火炮膛内的点火传火过程。根据中心点火管的工作特征,建立了中心点火管传火孔射流场的二维/轴对称数学模型。依据CE/SE方法的思想,推导了二维CE/SE算法,用于数值计算传火孔射流场复杂波系的产生、演变与发展的过程。计算结果显示,传火孔射流场存在着激波和膨胀波等波系,并且相互影响,相互作用。计算表明,CE/SE方法具有很强的捕获强间断的能力。

The jet flows from vent holes in a center-core igniter strongly influence the process of ignition in guns. The two-dimensional mathematic models were set up to describe the jet flow for a vent hole in a center-core igniter. Based on the idea of the space-time conservation element and solution element （CE/ SE） method, a new CE/SE method was constructed for solving this two-dimensional equations of jet flow. The process of generation and development for complex waves of jet flow were simulated by this CE/SE method. Shocks and expansion waves for jet flow are observed, those complex waves are affected each other. The numerical simulation show that the CE/SE method deduced in this paper can effectually capture strong discontinuity such as shock.