The Effects of Wheel Design on the Aerodynamic Drag of Passenger Vehicles
Artikel i vetenskaplig tidskrift, 2019

Approximately 25 % of a passenger vehicle’s aerodynamic drag comes directly or indirectly from its wheels, indicating that the rim geometry is highly relevant for increasing the vehicle’s overall energy efficiency. An extensive experimental study is presented where a parametric model of the rim design was developed, and statistical methods were employed to isolate the aerodynamic effects of certain geometric rim parameters. In addition to wind tunnel force measurements, this study employed the flowfield measurement techniques of wake surveys, wheelhouse pressure measurements, and base pressure measurements to investigate and explain the most important parameters’ effects on the flowfield. In addition, a numerical model of the vehicle with various rim geometries was developed and used to further elucidate the effects of certain geometric parameters on the flow field. The results showed that the most important parameter was the coverage area, and it was found to have a linear effect on the aerodynamic drag. Interestingly, parameters associated with the outer radial region of wheel (rim cover) were also found to be significant, along with the wheel depth of center (flatness). The flowfield measurements showed, again, that the coverage area had the most significant effect, with it directly affecting how much flow passes through the front rim and subsequently affecting features like the near-ground jetting vortex and vortices out of the wheelhouse. In addition, the coverage area also affected the pressure recovery at the base of the vehicle and the wheelhouse pressure. The effects of other parameters are also detailed in the paper. The effects of different coverage area at the front and rear rims on the drag coefficient were investigated, where having a high coverage at the rear reduced drag the most.

Författare

Adam Brandt

Chalmers, Mekanik och maritima vetenskaper, Fordonsteknik och autonoma system

Henrik Berg

Volvo Car Corporation

Micheal Bolzon

Chalmers, Mekanik och maritima vetenskaper, Fordonsteknik och autonoma system

Linda Josefsson

Volvo Car Corporation

SAE Technical Papers

0148-7191 (ISSN)

Vol. 2019 April

Styrkeområden

Transport

Energi

Ämneskategorier

Energiteknik

Farkostteknik

Strömningsmekanik och akustik

DOI

10.4271/2019-01-0662

Mer information

Senast uppdaterat

2019-06-11