边界形状对高压受限射流扩展稳定性影响

Effects of chamber wall shape on high-pressure gas jet expansionstability in bulk-loaded liquid

关键词:  整装液体  燃气射流  湍流  稳定性  数值模拟  高速录像

Key words:  Bulk-loaded liquid  Combustion-gas jet  Turbulent  Stability  Numerical simulation  High-speed video

摘要:

为了探索整装式液体炮中提高燃烧稳定性的控制方法,探讨了边界形状对高压受限射流扩展稳定性的影响。建立了二维轴对称气液两相湍流模型,对三级阶梯渐扩型、圆锥渐扩型和圆柱型充液室内的燃气射流扩展过程进行了计算。采用高速录像系统,对阶梯渐扩型和圆柱型边界约束下的射流扩展过程进行了观测。计算与实验结果相吻合。研究结果表明,采用阶梯渐扩型边界可提高高压受限射流的稳定性。

Abstract:

In order to explore the control methods to improve the combustion stability in bulk-loaded propellant gun, the effects of chamber wall shape on the high-pressure combustion-gas jet expansion stability were discussed. A 2D axisymmetric gas-liquid two-phase turbulent flow model was developed. The jet expansion processes in the stepped-wall, conical and cylindrical chamber were calculated. The jet expansion processes in the stepped-wall and cylindrical chamber were also recorded by the high-speed video system. The numerical simulation results coincide with the experiments, and the results show that using stepped-wall can improve the stability of combined high-pressure gas jet.