LEBU湍流减阻的展向扩展实验研究

利用大涡破碎器（ＬＥＢＵ）测量和考察了跨越平板湍流表面边界屋的速度型和动量厚度沿展向的分布，结果表明，ＬＥＢＵ的存在有可能扩大了层内流动参数沿展向的非均匀性；此外，还介绍了一个两对反向旋转的纵向涡模型，真实存在于风洞的横截面上，影响了展向非均匀性。使用本文介绍的一种沿展向非均匀性处理方法，对表面湍流摩阻估算的结果与使用摩擦阻力天平直接测量的结果基本一致。

SPANWISE EXTENDED EXPERIMENTAL STUDY ON THE LEBU TURBULENT DRAG REDUCTION

Using large-eddy break-up (LEBU)device the distribution of velocity profiles and momentum thickness cross the turbulent boundary layer on a flat-plate were measured and investigated. The results showed that the presence of LEBU device was able to exaggarate the inherent spanwise non-uniformity of the flow parameters in boundary layer over the plate, and a model about two pairs of counter-rotating longitudinal vortices was introduced which inherently exists in wind tunnel across section and exaggerated the spanwise non-uniformity The results of the plate surface turbulent frication calculated by the spanwise non-uniformity treatment method, introduction in this paper have a good agreement with those measured by the used friction balance.