针对当前广泛应用于低排放燃气轮机燃烧室中的空气雾化喷嘴，采用大涡模拟（Large Eddy Simulation，LES）和流体体积法（Volume of Fluid，VOF）研究了其在流动模糊（Flow Blurring，FB）和流动聚焦（Flow Focusing，FF）模式下射流一次破碎过程的差异。结果表明：两种模式的射流一次破碎过程均可分为3个阶段，气液交界面波动阶段、射流发展阶段和射流破碎阶段；喷嘴内部回流区的演变决定了气液交界面的波动程度，流动模糊模式下射流在后两个阶段的径向速度和形态变化程度均远高于流动聚焦模式，气泡回流过程在其射流破碎阶段占据主导地位，液体管道内气泡分布位置与涡的强度呈正相关。

Airblast atomizer is widely used in low emission gas turbine combustor at present. The difference of airblast atomizer in primary breakup process in flow blurring (FB) and flow focusing (FF) modes was studied using large eddy simulation and volume of fluid (LESVOF) method. Results show that the primary breakup process of jet in two modes can be divided into three stages, such as the fluctuation of airliquid interface, development of liquid jet and liquid jet breakup; the evolution of the recirculation zone inside atomizer determines the fluctuation degree of airliquid interface. In the later two stages, the radial velocity and changes in jet morphology in flow blurring mode are higher than that in flow focusing mode. The bubble reflow process plays a dominant role in the liquid jet breakup stage, and the bubble distribution position inside liquid tube is positively correlated with the intensity of the vortex.

V231.2

国家科技重大专项（J2019-Ⅲ-0012-0055）