边界形状对气液相互作用过程的影响  

Influence of Boundary Shape on Interaction Process of Gas and Liquid

作　　者：齐丽婷[1] 余永刚[1] 彭志国[1] 周彦煌[1] 

机构地区：[1]南京理工大学动力工程学院,南京210094

出　　处：《弹道学报》2008年第1期5-10,共6页Journal of Ballistics

基　　金：国家自然科学基金项目(50476043)

摘　　要：为了控制整装式液体发射药火炮燃烧稳定性,针对渐扩形和矩形药室结构,利用高速摄影方法,观察了气体射流在液体中的扩展过程,获得了泰勒空腔的扩展速度.在实验基础上,建立了含能气体射流在液体工质中扩展的二维模型,利用FLUENT软件对非稳态气体射流与液体工质相互作用的过程进行了模拟,获得了气体射流场等温线、等压线和等密度线分布图,分析了边界形状对射流扩展特性的影响.数值模拟结果表明,对于渐扩形边界,气体射流扩展到台阶处有旋涡出现;在相同条件下,矩形边界与渐扩边界相比,气体射流轴向扩展速度大,而径向扩展速度小.计算结果与实验结果吻合较好.In order to control the combustion stability of bulk-loaded liquid propellant gun, the expansion process of gas jet entering liquid was studied by high speed photographic method aiming at the expanding chamber and rectangular chamber. The expansion veloity in Taylor cavity was obtained. Based on the experiments, two-dimensional model of gas jet expansion process was developed. The unsteady interaction process of gas jet and liquid was simulated by the commercial software FLUENT. The isotherm, isobar and isostath graph were obtained in gas jet field. The influence of boundary shape on jet expansion was discussed. The simulation reult shows that for expanding boundary, there is wortex while gas jet expanding to the step. Under the same conditions, compared with expanding boundary, the axial expansion velocity of gas jet of rectangular is high, and the radial expansion velocity is low. The calculated results approximately accord with experimental results.

关 键 词：射流 气液相互作用 液体发射药火炮 

分 类 号：TJ397[兵器科学与技术—火炮、自动武器与弹药工程]