Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Tire dependence for the aerodynamics of yawed bicycle wheels
https://orcid.org/0000-0002-5107-2368
https://orcid.org/0000-0003-4627-3787
Abstract The aerodynamic characteristics of a modern road cycling wheel in cross wind are studied through force- and planar PIV measurements in the TU Delft Open Jet Facility. The performance of the 62 mm deep rim is evaluated for three tire profiles, and yaw angles up to 24°. 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 phenomenon, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to depend critically on the tire's surface structure. Larger stall angles, resulting in lower resistance, are obtained if the tire profile triggers laminar-to-turbulent boundary layer transition.
Highlights Experimental study of bicycle wheel aerodynamics by balance and PIV measurements. A wheel in crosswind experiences a drag reduction at moderate yaw angles. Stall angle depends critically on tire surface texture. Larger stall angles occur if the tire triggers boundary layer transition.
Tire dependence for the aerodynamics of yawed bicycle wheels
https://orcid.org/0000-0002-5107-2368
https://orcid.org/0000-0003-4627-3787
Abstract The aerodynamic characteristics of a modern road cycling wheel in cross wind are studied through force- and planar PIV measurements in the TU Delft Open Jet Facility. The performance of the 62 mm deep rim is evaluated for three tire profiles, and yaw angles up to 24°. 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 phenomenon, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to depend critically on the tire's surface structure. Larger stall angles, resulting in lower resistance, are obtained if the tire profile triggers laminar-to-turbulent boundary layer transition.
Highlights Experimental study of bicycle wheel aerodynamics by balance and PIV measurements. A wheel in crosswind experiences a drag reduction at moderate yaw angles. Stall angle depends critically on tire surface texture. Larger stall angles occur if the tire triggers boundary layer transition.
Tire dependence for the aerodynamics of yawed bicycle wheels
https://orcid.org/0000-0002-5107-2368
https://orcid.org/0000-0003-4627-3787
Abstract The aerodynamic characteristics of a modern road cycling wheel in cross wind are studied through force- and planar PIV measurements in the TU Delft Open Jet Facility. The performance of the 62 mm deep rim is evaluated for three tire profiles, and yaw angles up to 24°. 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 phenomenon, also referred to as the sail-effect, is limited by the stall angle of the tire-rim profile. The stall angle is found to depend critically on the tire's surface structure. Larger stall angles, resulting in lower resistance, are obtained if the tire profile triggers laminar-to-turbulent boundary layer transition.
Highlights Experimental study of bicycle wheel aerodynamics by balance and PIV measurements. A wheel in crosswind experiences a drag reduction at moderate yaw angles. Stall angle depends critically on tire surface texture. Larger stall angles occur if the tire triggers boundary layer transition.
Tire dependence for the aerodynamics of yawed bicycle wheels
Jux, Constantin (Autor:in) / Sciacchitano, Andrea (Autor:in) / Scarano, Fulvio (Autor:in)
24.12.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Aerodynamics of yawed racing cycle wheels
| Online Contents | 1999
Aerodynamics of yawed racing cycle wheels
| Online Contents | 1999
Aerodynamics of bicycle wheel and frame
| Elsevier | 1990
Bicycle aerodynamics: History, state-of-the-art and future perspectives
| Elsevier | 2020
Thickness Effect for Yawed Surface-Piercing Bodies
| British Library Conference Proceedings | 1992