The effect of oscillatory boat-tail flaps on the near wake of a prototypical heavy vehicle

Martin Johansson, John Sheridan, Sverker Fredriksson

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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Abstract

Due to the increased interest in the aerodynamics of truck /trailer combinations as a means to reduce their fuel consumption, experiments have been conducted on a model of a trailer to study possible changes in its near wake arising form attached aft-flaps. The model was fitted with vertical flaps on both sides of the back plate, which were set to oscillate at given frequencies and amplitudes. Experiments were carried out using the PIV system in a Water Channel at Monash University. The oscillation of the flaps perturbed the flow in such a way that the shear layer was significantly changed and the roll up of vortices was moved further upstream, causing a rise in the rate of entrainment and a shorter reattachment length. It also had the effect of a reduced wake size and higher velocities within the wake. These are all effects that are consistent with an increase in the base pressure at the back plate of the trailer and therefore also a reduced drag coefficient, since they are strongly connected.

Original languageEnglish
Title of host publicationASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting Collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels, FEDSM2010
Pages2641-2647
Number of pages7
Volume1
EditionPARTS A, B AND C
DOIs
Publication statusPublished - 2010
EventASME Fluids Engineering Division Summer Meeting (FEDSM) 2010 - Montreal, Canada
Duration: 1 Aug 20105 Aug 2010
Conference number: 3rd
http://proceedings.asmedigitalcollection.asme.org/volume.aspx?volumeid=15675

Conference

ConferenceASME Fluids Engineering Division Summer Meeting (FEDSM) 2010
Abbreviated titleFEDSM 2010
CountryCanada
CityMontreal
Period1/08/105/08/10
OtherASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting, FEDSM 2010 Collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
Internet address

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