矩形波状壁面二维层流运动阻力特性的研究

Study on Resistance Characteristic of Two Dimensional Laminar Flow over Rectangular Wavy Wall

采用有限体积法对雷诺数Re<2000的层流流态下周期性矩形筋条波状壁面阻力特性进行了数值模拟,针对不同无量纲波幅a/h与各种雷诺数的组合,计算了壁面应力分布特性。通过实验与数值法论证结果表明,波状壁面下水流的形状阻力、摩擦阻力随雷诺数增加而增大,提出了周期性矩形波状波边界层流沿程平均水头损失系数ξ的概念,可获平均阻力系数随雷诺数和筋条几何参数间的变化规律,具有实用价值。

Resistance characteristic of laminar flow over rectangular wavy wall was investigated numerically and experimentally. The finite volume method and SIMPLE algorithm were applied to compute the governing equation. Physical model was applied to measure local head losses characteristic, shows that the characteristic of pressure and shear stress distributing on the boundary grows when Reynolds number grows. Besides, the average coefficient of head loss over recrtangular wavy wall was put forward. Finally, the change law of the average coefficient was obtained, when Reynolds number or the geometric parameter of rib changes.