The Effect of Single Dielectric Barrier Discharge Actuators in Reducing Drag on an Ahmed Body

Saber Karimi,Arash Zargar,Mahmoud Mani,Arman Hemmati

doi:10.3390/fluids5040244

Abstract

The feasibility of a single dielectric barrier discharge (SDBD) actuator in controlling flow over an Ahmed body, representing a simplified car model, has been numerically and experimentally investigated at Reynolds numbers of 7.68×105 and 2.25×105. The Ahmed body had slant angles of 25∘ and 35∘. The results showed that SDBD actuators could significantly enhance the aerodynamic performance of the Ahmed body. Several arrangements of the actuators on the slant surface and the rear face of the model were examined to identify the most effective arrangement for drag reduction. This arrangement resulted in an approximately 6.1% drag reduction. This improvement in aerodynamic performance is attributed to the alteration of three-dimensional wake structures due to the presence of SDBD, which coincides with surface pressure variations on the slant and rear faces of the Ahmed body.

Highlights

Controlling the flow around ground vehicles has been studied extensively for drag reduction purposes, leading to improved efficiency
We begin by looking at the results associated with implementing the single dielectric barrier discharge (SDBD) actuators at five different locations and two Reynolds numbers (7.68 × 105 and 2.25 × 105 )
The size of the separation bubble and reattachment point of the separated flow depend on the Reynolds number, which agrees with findings of M

Summary

Introduction

Controlling the flow around ground vehicles has been studied extensively for drag reduction purposes, leading to improved efficiency. The combination of these improvements reduces the fuel consumption in ground transportation vehicles, and green-house gas emissions associated with them. Based on previous studies in this field, it is clear that active flow control methods can be efficiently used for reducing the drag force of bluff bodies. Dielectric barrier discharge (DBD) actuators are used as an active control method based on this principle The characteristics of these actuators, such as their applicability on a surface without significant change of geometry, fast time-response, small size and static parts, motivate their applications in a wide range of industries [5]

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