Abstract
Previous wind-tunnel studies were focused mainly on lonely standing windbreaks or wind fences with respect to their wind velocity reduction efficiency and effective shelter distance. In presented wind-tunnel study, we investigated the effects of a three different fence porosities (0.5, 0.25 and 0) embodied in a shelter-like building for coal convey by means of two-component Laser Doppler Anemometry (LDA). The turbulent flow characteristics behind the fences were compared with those performed without the fence. For characterization of the fence effectiveness we used following quantities: wind-speed and turbulence kinetic energy reduction, and time fractions of the turbulent coherent structures associated with the sediment transport (sweeps and outward interactions). Results from mentioned quantities revealed that for the case of embodied fence the shelter construction has significant impact on the flow characteristics behind. The fence of the 0.5 porosity has been indicated as the most shelter effective considering the studied quantities.
Highlights
The windbreaks or wind fences have been studied since the 1940th
The fence shelter efficiency is evaluated as the reduction of the wind velocity and downwind distance for which wind velocity remains below the threshold velocity [1]
We present twofold extension relating to the fence shelter efficiency analysis: construction complexity and turbulent coherent structures
Summary
The windbreaks or wind fences have been studied since the 1940th. The main objectives of these studies remain the same: shelter efficiency and the factors that help to optimize the windbreak or wind fence design with respect to control the particle sedimentation (sand, dust, snow, etc.). The fence shelter efficiency is evaluated as the reduction of the wind velocity and downwind distance for which wind velocity remains below the threshold velocity [1]. Lower porosity brings about higher wind velocity reduction. Higher turbulent intensities, shear stresses and pressures are produced as well. These flow turbulent characteristics are unfavourable to fence efficiency since decreasing the fence shelter distance and enhancing the particle uplift just downstream the fence
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