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了解旋转管式膜分离器内的流体流动对于了解其分离机理甚为重要。论文首先介绍膜分离器的结构，得出定常流动时膜分离器环隙间流体切向速度表达式和分布曲线；然后建立了流体运动N-S方程，采用摄动法和贝塞尔函数方法, 得出流动失稳时内筒的临界转速，导出环隙间流体径向速度和流线的近似表达式。当内筒转速超过临界转速时, 环隙间将生成Taylor涡。最后，绘制了环隙间径向速度分布曲线和Taylor涡流线。
Understanding the fluid flow within a rotating tubular membrane separator is important to understand its separation mechanism. Firstly, the structure of the membrane separator is introduced, and the expression and distribution curve of the fluid tangential velocity in the annular space of the membrane separator during steady flow are obtained. Then, the NS equation of fluid motion is established. By using perturbation method and Bessel function method, The critical rotational speed of the inner cylinder when the flow is unstable is deduced. The approximate radial flow velocity and the approximate expression of the flow line are derived. When the inner cylinder speed exceeds the critical speed, ring vortex will generate Taylor vortex. Finally, the radial velocity distribution curve between the annulus and the Taylor eddy current curve are plotted.