Aerodynamics of a convex bump on a ground-effect diffuser

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dc.contributor.authorEhirim, Obinna
dc.contributor.authorKnowles, Kevin
dc.contributor.authorSaddington, A. J.
dc.contributor.authorFinnis, Mark V.
dc.date.accessioned2018-12-12T10:04:45Z
dc.date.available2018-12-12T10:04:45Z
dc.date.issued2018-04-19
dc.description.abstractA ground-effect diffuser is an upward-sloping section of the underbody of a racing car that enhances aerodynamic performance by increasing the downforce, thus improving tire grip. The downforce generated by a diffuser can be increased by geometric modifications that facilitate passive flow control. Here we modified a bluff body equipped with a 17° diffuser ramp surface (the baseline/plane diffuser) to introduce a convex bump near the end of the ramp surface. The flow features, force and surface pressure measurements determined in wind-tunnel experiments agreed with previous studies but the bump favorably altered the overall diffuser pressure recovery curve by increasing the flow velocity near the diffuser exit. This resulted in a static pressure drop near the diffuser exit followed by an increase to freestream static pressure, thus increasing the downforce across most of the ride heights we tested. We observed a maximum 4.9% increase in downforce when the modified diffuser was compared to the plane diffuser. The downforce increment declined as the ride height was gradually reduced to the low-downforce diffuser flow regime.en_UK
dc.identifier.citationEhirim OH, Knowles K, Saddington AJ, Finnis MV. (2018) Aerodynamics of a convex bump on a ground-effect diffuser. Journal of Fluids Engineering, Volume 140, Issue 9, 19 April 2018, Article number 091102; Paper No: FE-17-1625en_UK
dc.identifier.cris22120087
dc.identifier.issn0098-2202
dc.identifier.urihttps:doi.org/10.1115/1.4039518
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13720
dc.language.isoenen_UK
dc.publisherJournal of Fluids Engineeringen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectaerodynamicsen_UK
dc.subjectground-effect diffuseren_UK
dc.subjectconvex-surfaceen_UK
dc.subjectpressure-recoveryen_UK
dc.subjectdownforceen_UK
dc.titleAerodynamics of a convex bump on a ground-effect diffuseren_UK
dc.typeArticleen_UK

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