为了降低流体通过变径时的局部阻力,让边界形状与流线最大限度的重合,避免流动过程产生的旋涡消耗能量,从而达到减阻的目的.为了找到流体通过变径时的流线的运动方程,对此提出了一种变径减阻的方法.%In order to reduce the local resistance of the fluid when it passes through the structure of changing diameter make the boundary shape coincide with the streamline to the maximum extent,and avoid the vortex generated in the flow process consuming energy,so as to achieve the purpose of drag reduction. In order to find the equation of motion of the streamline when the fluid passes through the the structure of changing diameter, a reducing drag method is proposed.
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