摘要
利用VOF(volume of fluid)方法对旋流式喷嘴气液两相流动进行了数值模拟。分析了缩放型出口结构功能和其内的流场特征。结果表明,喷嘴出口处液膜厚度和速度分布存在周向不均匀性。旋流室与出口段的结构连接方式较充分地利用了旋流室的加速功能,但也会造成流场方向强烈扭曲。随入口压力增大,出口液体的径向、切向和轴向速度均增大,而液体速度方向变化微小。收缩段和喉部上部对液体有加速作用;喉部能较平滑的引流;扩张段损耗了液体速度,但足够长的扩张段有控制液体喷淋方向作用。
The numerical simulation on gas-liquid two-phase flow of a swirl nozzle was presented by VOF(Volume of Fluid) method.The analysis focused on the structural function of convergent-divergent outlet portion and the flow characteristics inside.The results show that the shape and velocity distribution of the liquid film at the exit are asymmetrical.The linking method between swirl chamber and outlet portion makes better use of swirl chamber to accelerate liquid,meanwhile,causing the direction of the flow field strongly distorted.With the increment of the inlet pressure,the radial,tangential and axial velocities of the liquid at the exit increase but the flow direction of the liquid changes slightly.The convergent segment and the upper part of the throat have accelerating effect on the liquid film.The throat transfers the flow smoothly.The flow velocity is attenuated through the divergent segment,but the spray angle is restricted with the divergent segment long enough.
出处
《热科学与技术》
CAS
CSCD
北大核心
2012年第2期176-181,共6页
Journal of Thermal Science and Technology
基金
辽宁省自然科学基金计划资助项目(20102031)
关键词
旋流喷嘴
VOF方法
两相流
数值模拟
缩放型出口
swirl nozzle
volume of fluid(VOF) method
two-phase flow
numerical simulation
convergent-divergent outlet
