激励横向射流对超声速混合中流向涡影响的数值研究

摘要

为增强燃料与超声速气流的混合,以达到较好的混合效果,利用FLUENT DES方法对1 kHz激励横向射流对超声速混合中流向涡的影响进行了数值模拟.通过与无激励射流的工况进行对比发现,因大尺度结构的提早形成,激励射流将射流核心中的流向涡对的能量迅速打散,底部涡对迅速扩大并且向上抬升,并夹挤射流核心涡对,最终将之取代,造成流场剧烈变化.对横向射流进行激励有利于增强混合.%In order to achieve the better mixing of fuel and supersonic flow.Numerical investigation of the effect of the transverse1 kHz-excited jet on the streamwise vortex in supersonic mixing was performed by FLUENT DES.The results showed that the excited jet could rapidly break the energy core of transverse jet, which made the bottom vortex pair expanded faster and lifted towards main flows.The lifted vortex pair clipped the core vortex of transverse jet that was replaced finally.It made the flow field changed violently.The excited jet could enhance the mixing better.