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The effect of oscillatory boat-tail flaps on the near wake of a prototypical heavy vehicle
Luleå tekniska universitet.
Department of Mechanical and Aerospace Engineering, Monash University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2010 (English)In: Proceedings of the ASME Fluids Engineering Division summer conference 2010: presented at ASME 2010 3rd Joint US-European Fluids Engineering Division summer meeting, August 1 - 5, 2010, Montreal, Canada ; [jointly with the 8th International Conference on Nanochannels, Microchannels, and Minichannels (ICNMM), and the 7th International Symposium on Fluid Structure Interactions, Flow-Sound Interations, and Flow-Induced Vigrations & Noise (FSI2 & FIV+N)], New York: American Society of Mechanical Engineers , 2010, Vol. 1, Symposia – Parts A, B, and C, 2641-2647 p.Conference paper, Published paper (Refereed)
Abstract [en]

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

Place, publisher, year, edition, pages
New York: American Society of Mechanical Engineers , 2010. Vol. 1, Symposia – Parts A, B, and C, 2641-2647 p.
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Fysik
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URN: urn:nbn:se:ltu:diva-35692DOI: 10.1115/FEDSM-ICNMM2010-30629Scopus ID: 80055023704Local ID: a56d8c2c-15b8-4888-94a0-a5b470287373ISBN: 978-0-7918-4948-4 (print)OAI: oai:DiVA.org:ltu-35692DiVA: diva2:1008945
Conference
ASME 2010 Joint US-European Fluids Engineering Summer Meeting : 01/08/2010 - 05/08/2010
Note
Godkänd; 2011; 20111114 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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Fredriksson, Sverker

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