Turbulence Characteristics of Large-Scale Boundary Layer in Wind Tunnel Generated with Active Turbulence Grid

Abstract

Turbulence characteristics of boundary layer in wind tunnel generated by active turbulence grid have been experimentally investigated. Through the measurement with an x-type how wire, the experimental data of turbulence statistics, including higher-order moment, was accumulated, and it was found that the Reynolds shear stress of boundary layer significantly increases with the active turbulence grid. Then, the skewness and flatness factors of velocity fluctuations revealed that large-scale fluid motions in the outer layer played a predominant role in the generation of turbulence of boundary layer.