中文摘要：

为了研究整装式液体发射药火炮燃烧稳定性的控制方法，针对渐扩型药室结构，建立了含能气体射流在液体工质中扩展的两维模型，应用FLUENT应用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。探讨了渐扩型结构尺寸、喷气压力和喷口直径参数变化对射流扩展形态的影响，获得了射流场等温线、等压线和等密度线图。结果表明：当渐扩尺寸比为0．8、喷气压力大于30MPa、喷孔直径大于2mm时，气体射流发展不稳定，气液湍流掺混强烈。模拟出的射流轴向扩展速度和实验结果基本吻合。

英文摘要：

To study the method of controlling the combustion stabillty in bulk-loaded liquid propellant gun, a 2-D model of gas jet expansion process in the stepped-wall chamber was developed. The unsteady process of gas jet interaction with llquid was simulated by the commercial software FLUENT. The influences of chamber configuration, jet pressure and nozzle diameter on jet shape were discussed. The isothermal and isobaric graphs and density isograms of gas jet field were obtained. Results show that when the stepped-wall chamber dimension ratio is 0.8, and jet pressure is more than 30 MPa, or nozzle diameter is more than 2 mm, gas jet expansion process is unsteady. Mixing process between gas and liquid is strong. The calculated expansion displacement of gas jet is in good agreement with the experimental data.