Abstract
Aerodynamic characteristics of two-dimensional, slotted bluff bodies are experimentally investigated. The models consist of a series of thin flat plates arranged to form flat and curved geometries. Flow visualizations, base pressure measurements, mean velocity vector measurements, arid drag force measurements are conducted to analyze the effects of spacing ratio (i.e., porosity), curvature, and a center opening (i.e., vent). Low-porosity model configurations produced stable near-wake patterns with enhanced vortex sheddings downstream. Model curvature reduced drag forces and weakened the vortex sheddings. Stabilizing effect of curvature on the nearwake patterns was also found. A vent combined with large model curvature was found to reduce drag force significantly as well as suppress the vortex sheddings among models with equivalent porosity.
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