波瓣混合流场流向涡的数值分析

 借助N-S方程对波瓣喷管混合装置的流场进行了数值分析。采用三维贴体曲线坐标，非交错网格法和K－ε两方程湍流模型，对波瓣喷管内外两侧的气流通道及波瓣喷管下游的混合段流场统一进行了数值计算。得出了速度场和流向涡及正交涡的分布，并对流向涡的发展规律及其对正交涡分布规律的影响作了分析。并对混合管壁面的压力分布和出口速度型与实验值进行了比较。

NUMERICAL ANALYSIS OF STREAMWISE VORTICITY IN THE FLOW-FIELD OF A LOBED-MIXER

A numeriacl analysis on the flow field of a lobed mixer was made by means of N S equations. The computation was achieved on the whole flow field including main flow channel, secondary flow channel located on either side of the lobe and downstream mixing duct. Three dimensional body fitted coordinates and the method of non staggered grids together with k ε turbulence model were used in the computation. The flowfield and distribution of streamwise and normal vorticity were obtained. Analyses were made on the development of streamwise vorticity and its effects on the normal vorticity. Comparisons were also made between computational and experimental data of pressure distribution on the wall of the mixing duct and velocity distribution on the exit of the duct.