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Active flow control on a square-back road vehicle

Cerutti, J.J., Sardu, C., Cafiero, G. and Iuso, G. (2020) Active flow control on a square-back road vehicle Fluids, 5 (2), 55.

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Abstract

An experimental investigation focused on the manipulation of the wake generated by a square back car model is presented. Four continuously-blowing rectangular slot jets were mounted on the rear face of a 1:10 commercial van model. Load cell measurements evidence drag reduction for different forcing configurations, reaching a maximum of 12% for lateral and bottom jets blowing. The spectral analysis of the pressure fluctuations evidence, for all forced cases, an energy attenuation with respect to the natural case, especially close to the shedding frequency. An energy budget highlighted the most efficient forcing configurations accounting for both the drag reduction and the power required to feed the blowing system. Two main configurations are considered: the maximum drag reduction and the best compromise, yielding 5% drag reduction and a convenient energy balance. Particle Image Velocimetry (pPIV) and stereoscopic PIV (sPIV) experiments were performed allowing the three-dimensional reconstruction of the wake in the three considered configurations. Consistently with static and fluctuating pressure measurements, sPIV results reveal a dramatic change in the wake structure when the jets blow in the maximum drag reduction configuration. Conversely, the best compromise configuration reveals a wake structure similar to the natural one.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Cerutti, J.J.
Sardu, C.
Cafiero, G.g.cafiero@surrey.ac.uk
Iuso, G.
Date : 21 April 2020
DOI : 10.3390/fluids5020055
Copyright Disclaimer : © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : Active flow control; Bluff body wake; Drag reduction; Stereoscopic PIV
Depositing User : Clive Harris
Date Deposited : 11 May 2020 21:37
Last Modified : 11 May 2020 21:37
URI: http://epubs.surrey.ac.uk/id/eprint/856378

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