流体在内管做轴向运动的偏心环空中的速度分布

Velocity distribution of fluid in eccentric annuli with the inner cylinder reciprocating axially

建立了双极坐标系下牛顿流体在内管做轴向周期性往复运动的偏心环空中非定常流的控制方程,对流体的轴向速度分布用有限差分法进行了数值求解,绘制了速度分布曲线,分析了内外管的偏心距、内管的冲程和冲次对流体在偏心环空中速度分布的影响.分析结果表明:随着偏心距减小,最宽和最窄间隙处的速度分布越来越接近;随着内管的冲程和冲次的增加,内管的轴向往复运动对速度分布的扰动增大.

The governing equations of unsteady flow of Newtonian fluid in eccentric annuli with the inner cylinder reciprocating axially in bipolar coordinate system are established.The equations are solved numerically in finite difference method for Newtonian fluid and the curves of velocity distribution are plotted.The effects of the eccentricity between the inner cylinder and the outer cylinder,the stroke and frequency of the inner cylinder on the velocity distribution of the fluid in eccentric annuli are analyzed.The results show that velocity distribution in the widest clearance is close to that in the narrowest clearance with the eccentricity decreasing,and that the perturbation of velocity distribution is aggravated with the stroke and frequency increasing,which is caused by the inner cylinder reciprocating axially.