旋流喷嘴内部流场的数值模拟和实验研究  

Numerical and experimental investigation of flow in swirling nozzle

作　　者：尹俊连[1] 焦磊[1] 仇性启[2] 王乐勤[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]中国石油大学机电工程学院,山东东营257061

出　　处：《浙江大学学报（工学版）》2009年第5期968-972,共5页Journal of Zhejiang University：Engineering Science

基　　金：浙江省自然科学基金资助项目(Y107467)

摘　　要：为了揭示旋流喷嘴内部流动机理,有效预测其外部雾化特性,采用VOF多相流模型和RNGκ-ε湍流模型对旋流喷嘴内部的气液两相流动进行了数值模拟.通过对喷嘴结构进行合理的网格划分和特殊边界条件设置,计算了喷嘴内部的速度场、压力场和空气芯的形状尺寸.分别通过激光测速仪和高速摄像仪测量出口速度、空气芯的直径和雾化半锥角,对计算结果进行了验证.结果表明,旋流喷嘴内部流动为Rankine涡结构,其雾化特性如雾化角和液膜厚度等可以通过分析出口处流场得到.The gas-liquid two-phase flow in swirling nozzle was simulated using the VOF （volume of fluid） model and the RNG κ-ε turbulence model in order to investigate the flow mechanism and predict the atomization characteristics efficiently. Through the proper partition of mesh generated for the nozzle structure and the special setting of boundary condition, the velocity field, the pressure field and the dimensions of air core were calculated. Experiments using laser Doppler velocimetry （LDV） and high-speed-photographic camera were carried out to validate the computed values of the velocity at the exit and the dimensions of air core. The simulation results agreed well with the experiment data, including the axial velocity, the spray cone angle and the thickness of the liquid film at the exit. The results show that the internal flow structure in the nozzle is Rankie vortex and the outside atomization characteristics such as the spray cone angle and the thickness of the liquid film can be obtained by analyzing the flow field at the exit.

关 键 词：旋流 VOF(volume of fluid) 两相流 雾化 

分 类 号：TK263.4[动力工程及工程热物理—动力机械及工程]