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The application of laser diagnostics to cycling aerodynamics

Citation

Crouch, TN and Barry, N and Venning, JA and Burton, D and THompson, MC and Sheridan, J, The application of laser diagnostics to cycling aerodynamics, Proceedings of the Seventh Australian Conference on Laser Diagnostics in Fluid Mechanics and Combustion, 9-11 December 2015, Melbourne, Australia, pp. 161-165. ISBN 978-0-646-94892-8 (2015) [Refereed Conference Paper]


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Abstract

To improve the aerodynamic performance of cyclists, detailed information of the flow field is required around these highly three-dimensional bluff-body geometries. Using traditional measurement techniques with cyclists in a wind tunnel, it is often difficult or impractical to acquire detailed flow field surveys. In this paper two examples are discussed where highresolution Particle Image Velocimetry has been undertaken in a water channel to investigate the wake dynamics of a single pedalling cyclist and the flow between multiple cyclists. These areas have previously been difficult to measure experimentally using intrusive measurement techniques. The first example provides a comparison of the phase-averaged wake of a 1:4.5 scale pedalling cyclist/bicycle combination in the water channel and that of a full-scale cyclist mannequin of similar geometry and position in a wind tunnel. The second example shows an application of PIV to measure the flow field between two drafting cyclists. Good agreement is observed between the large-scale wake of the scale model and full-scale mannequin despite an order-of-magnitude difference in Reynolds number. The drafting model shows that for spacings greater than a bike length, the trailing rider has negligible effect on the wake of the upstream rider

Item Details

Item Type:Refereed Conference Paper
Keywords:cycling aerodynamics, vortex flow, fluid dynamics
Research Division:Engineering
Research Group:Interdisciplinary Engineering
Research Field:Fluidisation and Fluid Mechanics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Venning, JA (Mr James Venning)
ID Code:115603
Year Published:2015
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-03-31
Last Modified:2017-05-01
Downloads:15 View Download Statistics

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