The Ring of Fire for in-Field Sport Aerodynamic Investigation

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Abstract

A novel measurement system, the Ring of Fire, is deployed which enables the aerodynamic drag estimation of transiting cyclists. The system relies upon the use of large-scale stereoscopic PIV and the conservation of momentum within a control volume in a frame of reference moving with the athlete. The rider cycles at a velocity of approximately 8 m/s, corresponding to a torso based Reynolds number of 3.2 × 105. The measurements upstream and in the wake of the athlete are conducted at a rate of 2 kHz within a measurement plane of approximately 1000 × 1700 mm2. The non-dimensional, ensemble-averaged streamwise velocity fields compare well to literature and the ensemble-averaged drag area shows a rather constant value along the wake with an uncertainty of 5%. A comparison with wind tunnel force balance measurements shows discrepancies which may be partly attributed to the bike supports and stationary floor in the wind tunnel measurements. The 25% drag difference measured between a rider in upright and time-trial position, however, matches literature well.
Original languageEnglish
Title of host publicationProceedings of the 12th Conference of the International Sports Engineering Association (ISEA 2018)
Subtitle of host publicationEngineering of Sport
EditorsHugo G. Espinosa, David R. Rowlands, Jonathan Shepherd, David V. Thiel
PublisherMDPI
Number of pages7
DOIs
Publication statusPublished - 2018
EventISEA 2018: 12th Conference of the International Sports Engineering Association 'Engineering of Sport' - Brisbane, Australia
Duration: 26 Mar 201828 Mar 2018

Publication series

NameProceedings
Number6
Volume2
ISSN (Electronic)2504-3900

Conference

ConferenceISEA 2018: 12th Conference of the International Sports Engineering Association 'Engineering of Sport'
CountryAustralia
CityBrisbane
Period26/03/1828/03/18

Keywords

  • speed sports
  • cycling
  • aerodynamic drag
  • in-field measurement system

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