涡脱落撞击潜入式喷管引起低频压力振荡研究  

Study on low frequency pressure oscillations induced by vortex impacting on submerged nozzle

作　　者：杨羽卓 郜冶[1] 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001

出　　处：《固体火箭技术》2016年第4期456-462,469,共8页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(11372079)

摘　　要：通过不同障碍高和不同加质的冷流数值模拟,着重研究碰撞频率(碰撞处压力振荡频率)与强度(碰撞处p_(rms)/p_(mean))对于SRM内压力振荡幅频特性的作用程度。研究结果表明,SRM内压力振荡幅度与碰撞处的压力振荡大小为相同量级。当碰撞强度较小时,碰撞只起到增强声场的作用;当碰撞强度较大时,碰撞产生的压力振荡随碰撞强度的增加逐渐覆盖淹没声场。SRM内压力振荡的幅频特性主要由涡脱落碰撞强度决定,一般只呈现低频且具有非声非线性特征。Cold flow numerical simulation of different obstacle＇s height and different mass flow injection was developed to study the effect of vortex impact frequency and intensity on pressure oscillations magnitude-frequency characteristic in chamber. The results show that the pressure oscillation amplitude in chamber and at the location of impact has the same order of magnitude. The impacts only strengthen acoustic field when the impact strength is not strong,but with the increase of impact strength,the pressure oscillation induced by impact gradually covers acoustic field. The pressure oscillations magnitude-frequency characteristic in chamber is mainly decided by the frequency and strength of vortex impacting,which usually presents low frequency,nonlinear and non-acoustic.

关 键 词：不稳定燃烧 涡脱落 压力振荡 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]