Abstract
Abstract In this study, measurements of the turbulence characteristics for a turbulent boundary layer flow past porous windscreen are reported. Measurement analysis includes maximum mean velocity reduction, maximum Reynolds stress reduction, turbulence intensity profile, turbulent velocity power spectrum, and Reynolds stress structure in the wake region of the windscreen. Results show that the maximum Reynolds stress reduction along the downstream distance from windscreen decays faster than the maximum mean wind speed reduction. The turbulence intensity profiles exhibit self-preserving in the wake region of windscreen for the cases of 15%, 30% and 50% porosity. Power spectrum analysis exhibits that most of the energy containing eddies in the wake region of the windscreen shift to the lower frequencies as the windscreen porosity increases. Quadrant analysis results show that the sweep and ejection events dominate the Reynolds stress contributions in the wake region of windscreen. The Reynolds stress contribution difference between sweep and ejection events becomes significant as the distance from the wall and downstream distance behind the windscreen decrease.
Published Version
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