气固两相流动中非球形颗粒所受曳力的数值研究

采用数值计算的方法研究了非球形颗粒在气固两相流动中所受的曳力，在Re＜100的条件下对流经3种具有典型几何特征的非球形颗粒（正方体、圆柱体和圆台体）的流体流动进行了详细的数值计算.通过比较计算结果与文献中所推荐的3种曳力系数修正关系发现：Ganser方法与本文计算结果符合最好.通过对两种不同颗粒摆放条件的流动进行计算发现：对于不同的颗粒与来流角度，非球形颗粒所受到的曳力具有较大的差别.

NUMERICAL SIMULATION OF DRAG FORCE ON NON-SPHERICAL PARTICLE IN GAS-PARTICLE TWO-PHASE FLOW

Study of the effect of non-spherical particle on drag for ce was carried out by using numerical simulation. At Re<100, the flow over t hree different non-spherical particles (cube, cylinder and frustum) was calcula ted with N-S equations. In particular,three promising correlations for the dra g coefficient of non-spherical particle were critically examined with the compu tational results. The best method appeared to be that of Ganser which used the equal volume sphere diameter and the sphericity of particle. Comparing the resu lts obtained by two different cylinders arrangements, the axis of cylinder perpe ndicular to the coming flow direction and parallel to that, the divergence betwe en these two cases was very obvious.