Aerodynamics of a cycling wheel in crosswind by coaxial volumetric velocimetry

C. Jux; A. Sciacchitano; F. Scarano

doi:10.18409/ispiv.v1i1.202

Aerodynamics of a cycling wheel in crosswind by coaxial volumetric velocimetry

^*Corresponding author for this work

Aerodynamics

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

The aerodynamic characteristics of a modern road cycling wheel in crosswind are studied through force measurements and 3D velocimetry in TU Delft’s Open Jet Facility. The performance of the 62 mm deep rim is evaluated for two tire profiles, and yaw angles up to 20◦ . All measurements are executed at 12.5 m/s (45 km/h) freestream- and wheel-rotational velocity. The wheel’s rim-tire section in crosswind is found to behave similar to an airfoil at incidence, ultimately resulting in a reduction of the wheel’s aerodynamic resistance with increasing yaw angle magnitude. This trend, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to be dependent on the tire surface texture and varies between 14◦ and 20◦.

Original language	English
Title of host publication	14th International Symposium on Particle Image Velocimetry
Number of pages	11
DOIs	https://doi.org/10.18409/ispiv.v1i1.202
Publication status	Published - 2021
Event	14th International Symposium on Particle Image Velocimetry - virtual event Duration: 1 Aug 2021 → 5 Aug 2021 Conference number: 14

Conference

Conference	14th International Symposium on Particle Image Velocimetry
Abbreviated title	ISPIV 2021
Period	1/08/21 → 5/08/21

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

3D PIV
Wheel aerodynamics
Cycling aerodynamics
Pressure analysis
Coaxial volumetric velocimetry

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10.18409/ispiv.v1i1.202

202-Article Text-570-1-10-20210929Final published version, 12.5 MB

Cite this

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title = "Aerodynamics of a cycling wheel in crosswind by coaxial volumetric velocimetry",

abstract = "The aerodynamic characteristics of a modern road cycling wheel in crosswind are studied through force measurements and 3D velocimetry in TU Delft{\textquoteright}s Open Jet Facility. The performance of the 62 mm deep rim is evaluated for two tire profiles, and yaw angles up to 20◦ . All measurements are executed at 12.5 m/s (45 km/h) freestream- and wheel-rotational velocity. The wheel{\textquoteright}s rim-tire section in crosswind is found to behave similar to an airfoil at incidence, ultimately resulting in a reduction of the wheel{\textquoteright}s aerodynamic resistance with increasing yaw angle magnitude. This trend, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to be dependent on the tire surface texture and varies between 14◦ and 20◦.",

keywords = "3D PIV, Wheel aerodynamics, Cycling aerodynamics, Pressure analysis, Coaxial volumetric velocimetry",

author = "C. Jux and A. Sciacchitano and F. Scarano",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ; 14th International Symposium on Particle Image Velocimetry , ISPIV 2021 ; Conference date: 01-08-2021 Through 05-08-2021",

year = "2021",

doi = "10.18409/ispiv.v1i1.202",

language = "English",

booktitle = "14th International Symposium on Particle Image Velocimetry",

}

TY - GEN

T1 - Aerodynamics of a cycling wheel in crosswind by coaxial volumetric velocimetry

AU - Jux, C.

AU - Sciacchitano, A.

AU - Scarano, F.

N1 - Conference code: 14

PY - 2021

Y1 - 2021

N2 - The aerodynamic characteristics of a modern road cycling wheel in crosswind are studied through force measurements and 3D velocimetry in TU Delft’s Open Jet Facility. The performance of the 62 mm deep rim is evaluated for two tire profiles, and yaw angles up to 20◦ . All measurements are executed at 12.5 m/s (45 km/h) freestream- and wheel-rotational velocity. The wheel’s rim-tire section in crosswind is found to behave similar to an airfoil at incidence, ultimately resulting in a reduction of the wheel’s aerodynamic resistance with increasing yaw angle magnitude. This trend, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to be dependent on the tire surface texture and varies between 14◦ and 20◦.

AB - The aerodynamic characteristics of a modern road cycling wheel in crosswind are studied through force measurements and 3D velocimetry in TU Delft’s Open Jet Facility. The performance of the 62 mm deep rim is evaluated for two tire profiles, and yaw angles up to 20◦ . All measurements are executed at 12.5 m/s (45 km/h) freestream- and wheel-rotational velocity. The wheel’s rim-tire section in crosswind is found to behave similar to an airfoil at incidence, ultimately resulting in a reduction of the wheel’s aerodynamic resistance with increasing yaw angle magnitude. This trend, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to be dependent on the tire surface texture and varies between 14◦ and 20◦.

KW - 3D PIV

KW - Wheel aerodynamics

KW - Cycling aerodynamics

KW - Pressure analysis

KW - Coaxial volumetric velocimetry

U2 - 10.18409/ispiv.v1i1.202

DO - 10.18409/ispiv.v1i1.202

M3 - Conference contribution

BT - 14th International Symposium on Particle Image Velocimetry

T2 - 14th International Symposium on Particle Image Velocimetry

Y2 - 1 August 2021 through 5 August 2021

ER -

Aerodynamics of a cycling wheel in crosswind by coaxial volumetric velocimetry

Abstract

Conference

Bibliographical note

Keywords

Access to Document

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Cite this