颗粒加入方式对平面射流中颗粒弥散影响的离散涡模拟

Numerical Simulation of Influence of Introducing Mode on Particle Dispersion in Planar Jet by Discrete Vortex Method

用离散涡方法对平面射流进行数值模拟,得到了与实验定量符合的速度场,采用单向耦合的Lagrangian方法模拟了流场中颗粒的弥散.颗粒进入流场的初始径向位置由满足不同概率分布的随机数决定.结果表明:对St 1的颗粒,初始径向位置的概率分布对其弥散的影响不显著;对St^o(1)和St 1的颗粒,弥散显著受到初始径向位置概率分布的影响,其弥散函数在上抛物线形概率分布时最大,均匀分布时次之,截尾高斯分布时最小.

The planar jet flow was numerically simulated by discrete vortex method and time averaged velocity well-coincident with experimental measures was obtained. By means of the one-way coupling Lagrangian method, particles were tracked in the planar jet. The initial radial locations of the panicles at the exit of the plates were determined by random numbers satisfying different probability distributions, which was different from the previous work. The results show that for panicles with St〈1, probability distributions at the initial transverse locations have little influence on their dispersion, but in the case St - o （ 1 ） or St 〉 1, panicle dispersion is affected by the initial probability distributions notably. Particles added into flow with up-parabola distribution on the initial transverse locations obtained maximal dispersion, then with uniform distribution and chopped Gauss distribution in turn.