微气泡降低平板阻力的研究

A Study on the Drag Reduction of the Plate by Microbubbles

本文根据计算结果,研究了边界层中的微气泡对平板表面摩擦阻力的影响。建立了含有微气泡的平板边界层方程,并采用一种简单的混合长度模型和有限差分方法对该方程进行了数值计算。分析和讨论了某些参数变化对微气泡降阻的影响。计算结果表明,在一定条件下,湍流边界层的表面摩擦阻力可降低60％左右,其数量级和趋势与国外实验结果相比大体上一致。另外,本文对微气泡降阻机理提出了自己看法。

The effect of microbubbles in the boundary layer on the skin friction of the plate is presented in this paper based on the computational results. The equations of the boundary layer containing microbubbles on the plate are established, then calculated employing a simple mixing length model and a finite difference method. The effect of some parameters on microbubbles drag reduction is analysised and discussed. The computational results show the maxmum skin friction reduction is near 60% in the turbulent boundary layer on a certain condition, the order of magnitude and trends of the skin friction reduction are a good agreement with foreign experimental results. In addition, the ideas on the mechanisms of micro-bubbles drag reduction are presented.