Comparative Study of Drag Reduction of Square-back Vehicle Geometry using Steady blowing and Fluidic Oscillators Method

## Comparative Study of Drag Reduction of Square-back Vehicle Geometry using Steady blowing and Fluidic Oscillators Method

Volume-70 Issue-11
Year of Publication : 2022
Authors : Thanh-Long Phan, Tien Thua Nguyen
DOI : 10.14445/22315381/IJETT-V70I11P225

How to Cite?

Thanh-Long Phan, Tien Thua Nguyen, "Comparative Study of Drag Reduction of Square-back Vehicle Geometry using Steady blowing and Fluidic Oscillators Method," International Journal of Engineering Trends and Technology, vol. 70, no. 11, pp. 232-239, 2022. Crossref, https://doi.org/10.14445/22315381/IJETT-V70I11P225

Abstract
A 3D finite volume method numerical simulation was conducted on the square-back Ahmed model to compare the drag reduction capability and energy efficiency between steady blowing and fluidic oscillators flow control techniques. A parametric study was carried out with various operational conditions of actuators, i.e., the jet angle and velocity of the steady blowing method and the input mass flow rate of each actuator for a fluid oscillator. Applying both active flow control methods leads to an aerodynamic drag reduction of the Ahmed model. Furthermore, the analysis of the near-wake structure revealed a recovery of static pressure on the rear surface of the model. The control energy efficiency was then studied, and the results showed the best efficiency of 8.04 % for the steady blowing method at momentum coefficient C = 2.21 x 10-3 and jet angle θ = 30o. For the fluidic oscillator cases, each actuator had a maximum energy efficiency of 10.88 % at the input mass flow rate of 1.5 kg/h.

Keywords
Active Flow Control, CFD, Drag Reduction, Fluidic Oscillator, Steady Blowing Method.

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