两相流中柱状固粒对流体湍动特性影响的研究

Research on the Effect of Cylinder Particles on the Turbulent Properties in Particulate Flows

对含柱状固粒的两相流场 ,建立了包含柱状固粒对流场影响的流体脉动速度方程 ,在求解脉动速度方程的基础上 ,经平均得到流体的湍流强度和雷诺应力· 将该方法用于槽流湍流场的求解 ,并与单相流实验结果进行了比较· 计算中变化柱状固粒的参数 ,给出了固粒的体积分数、长径比、松驰时间对流场湍动特性的影响 ,说明粒子对流场的湍动特性起着抑制作用 ,其抑制的程度与粒子的体积分数、长径比成正比 。

The fluid fluctuating velocity equations which include the term of cylinder particles were established. The turbulent intensity and Reynolds stress of fluid were obtained by averaging fluctuating velocity based on the solution of the fluctuating velocity equations. Above approach was used to solve the channel turbulent flows, and computational results were compared with the experimental ones for the case of single phase flow. The effects of volume fraction of particles, the ratio of particle length to diameter and the particle relaxation time on turbulent properties were illustrated by changing cylinder particle parameters. It is shown that particles play a restraining role to turbulent properties in the flows. The degree of restraint is directly proportional to the volume fraction of particle, the ratio of particle length to diameter and inversely proportional to particle relaxation time.