游泳衣料的表面摩阻测量

本文介绍用二维激光流速仪对游泳衣料的局部表面摩阻作对比性实验的一组测量结果.由于游泳衣表面为具有高度柔弹性的粗糙壁面,所以表面摩阻系数的值由离壁面稍远的对数律层的速度分布求得.实验结果表明,不同衣料的表面摩阻的差别可达90%左右,国产的单向弹性奥纶游泳衣的表面摩阻系数最小.由此可知,这种具有纵向纹理的衣料对于减少水对运动员的阻力最为有利.

Skin Friction Coefficients of Swimming Cloths

Local skin friction coefficients of several swimming cloths are measured by a two-component laser-Doppler velocimetric system in a comparative experiment.As the surface of cloths are very rough and flexiable,the skin friction has to be estimated from the layer with logarithmic velocity distribution.Results indicate that the differences between skin frictions of different cloths approach to 90% and the cloths made in Dalian with one-directional exansibility is the best for swimming dressing.