基于接触判断方法的尾喷管堵盖分离运动分析

摘要

In order to study the interaction between the closure and the gas in the initial separation from the nozzle and subsequent process,a simulation model is established by using a numerical method combined with the Contact Detection and Porous Media model,in which a dynamic mesh technique is used to update the meshes of flow field.The research results show that the closure obtains a high impact kinetic energy from the high-pressure gas,.And compared with the practice of reserved gap,Contact Detection and Porous Media model can simulate the delayed effect of the Separation.%为研究堵盖在初始分离及后续过程中与燃气的相互作用,应用CFD和动网格技术,结合接触判断及多孔介质模型,建立了堵盖接触分离及后续运动的物理模型.研究结果表明,堵盖与高压燃气的相互作用,使堵盖获得较高的冲击动能;同时相较于非接触式预留缝隙的处理方法,接触判断耦合多孔介质模型的方法,更准确的模拟出堵盖的分离延迟效应.