淹没射流流场演化过程研究

摘要：采用大涡模拟方法（LES）研究了淹没射流紊动流场的演化过程，分析了速度、压力、涡量的演化规律和它们之间的内在联系。研究发现，压力场等值线呈一簇簇同心圆分布，沿射流轴线方向圆心高压和圆心低压交错分布，随着射流的进行，同心圆随射流下移并伴有变形、分裂、融合等现象；分析速度场发现射流轴线处存在高速流体团脱落现象，在固定点处的速度和压力大小有很好的负相关关系；分析涡量场发现涡旋的摆动造成了射流主体的摆动，涡旋的存在导致了压力场圆心低压和圆心高压交错分布的现象。

Study on the Flow Field of a Submerged Jet

Abstract: Large eddy simulations(LES) were utilized to explore the turbulent flow field evolution for submerged jet. The evolution of velocity, pressure and vorticity and the inherent relationship among them were analyzed. The results showed that the contours of pressure presented to be a cluster of concentric circles, and high pressure and low pressure circles appeared alternately along the jet axis. As jet impinged, the concentric circles were moving along the jet with deformation, split and merging. In the velocity field, it was found that the mass of high velocity in the axis separated from main flow and the velocity had the just negative correlation with pressure on the same point. It was vortex swing that caused the jet swing and pressure distribution also resulted from vortexes.