Experimental study of vortex shedding phenomenon induced by various bluff body geometries for use in vortex flowmeters

Abstract

Studying and understanding the vortex-shedding phenomenon in the wake region of bluff bodies is crucial in most fluid systems. This paper uses wind tunnel experiments to evaluate and assess the downstream flow of five bluff body models with various geometric shapes, including triangle, rectangle, square, trapezoid, and T-shape. The aim is to utilize these shapes in flowmeters and angle sensors (as a novel innovation). The velocity field, turbulence intensity, and vortex shedding frequency of the downstream airflow around these models were examined at different flow angles. Results indicate that rectangular and trapezoidal bluff bodies are more suitable for application in flow angle sensors using vortex than other geometries studied. Based on the results, recommend the T-shaped model over other geometries for use in vortex flow meters. Furthermore, the rectangular bluff body at a 107.5° angle provides the most suitable areas for observing vortices and measuring or calibrating hot-wire anemometer probes.