CUED Publications database

Investigation of Passive Porosity as a Means for Bluff-Body Drag Reduction

Gatto, A and Babinsky, H (2017) Investigation of Passive Porosity as a Means for Bluff-Body Drag Reduction. SAE International Journal of Commercial Vehicles, 11. ISSN 1946-391X

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Abstract

Copyright © 2018 SAE International. An investigation into the capability of passive porosity to reduce the drag of a bluff-body is presented. This initial work involves integrating varying degrees of porosity into the side and back faces of a small-scale model to determine optimum conditions for maximum drag reduction. Both force and pressure measurements at differing degrees of model yaw are presented, with the conditions for optimum performance, identified. At a length-based Reynolds number of 2.3 × 106, results showed a maximum drag reduction of 12% at zero yaw when the ratio of the open area on the back face relative to the side faces was between two and four. For all non-zero yaw angles tested, this ratio reduced to approximately two, with the drag benefit reducing to 6% at 10.5 degrees. From a supplementary theoretical analysis, calculated optimum bleed rate into the base for maximum drag reduction, also showed reasonable agreement to other results reported previously.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 25 Jun 2018 20:08
Last Modified: 01 Apr 2021 04:48
DOI: 10.4271/02-11-01-0006