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http://bura.brunel.ac.uk/handle/2438/18176
Title: | Application of Lobed Mixers to Reduce Drag of Boat-tailed Ground Vehicles |
Authors: | Rejniak, AA Gatto, A |
Keywords: | Drag reduction;Lobed mixers;Boat-tailed vehicles |
Issue Date: | 2019 |
Publisher: | Isfahan University of Technology |
Citation: | Journal of Applied Fluid Mechanics |
Abstract: | Minimising the aerodynamic drag of commercial vehicles is important economically and ecologically. This work demonstrates the effective use of lobed-mixing geometries, traditionally used to enhance flow mixing, as a viable, passive flow control method for reducing base pressure drag of boat-tailed ground vehicles. Experiments were performed on a 1/24th-scale Heavy Goods Vehicle representative model at a Reynolds number of 2.3 × 105 with force and hot-wire anemometry measurements used to quantify drag and wake characteristics. Tests on a baseline (no boat-tail), an unaltered boat-tail, and lobed-mixing configurations with varying pitch and height were compared. Overall, the baseline and unaltered boat-tail exhibited good correlation to previous results. This provided confidence in the methodology adopted. Results using lobed mixers showed up to a 10.2% drag reduction with the added vorticity produced acting to fundamentally shift the nature of the wake. This is manifested principally through the generation of counter-rotating vortical structures which enhance crosswise flow entrainment into the base wake. This action is observed to limit flow entrainment towards the ground leading to a higher wake and a characteristic ‘waist’. Enhanced mixing is also demonstrated. Overall, results suggest the suitability of lobed mixers as an effective means for drag reduction of boat-tailed ground vehicles. |
URI: | http://bura.brunel.ac.uk/handle/2438/18176 |
ISSN: | 1735-3572 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
Files in This Item:
File | Description | Size | Format | |
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FullText.pdf | 2.63 MB | Adobe PDF | View/Open |
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