Potential of Porsche Reference Cars for Aerodynamic Development

Cogotti, F.; Pfadenhauer, Michael; Wiegand, Thomas E. von

doi:10.1007/978-3-319-67822-1_15

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…Furthermore, during tunnel calibration, the flow field in the test section was adapted to the flow field on the road with the aid of full-scale reference vehicles. 10 The unique key feature of the tunnel is the interchangeable belt system. This comprises a five-belt configuration for series car development and a single wide-belt configuration which is mainly used in race car development weighing more than 20 tonnes each.…”

Section: Introductionmentioning

confidence: 99%

The aerodynamic development of the new Porsche Cayenne

Wolf¹

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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With significantly enhanced performance, the third generation of the Porsche Cayenne is even more closely oriented towards the principles of sports cars. In addition to improving the driving-dynamic characteristics, the aim of the development was to lower the drag as a contribution towards the reduction of fuel consumption and emissions. Increasing performance and a simultaneous reduction of drag are conflicting objectives, which led to a number of aerodynamic challenges during the development of the new Cayenne. In addition to detailed aerodynamic optimisations, the solution for the new Cayenne consisted of an extended adaptive aerodynamic concept, which enables a compromise between fuel consumption, performance, and comfort depending on the driving condition. The first part of the concept comprises an extended air flap system that, for the first time, enables complete closing of all cooling air inlets in the front end. The second part of the concept is reserved for the top-of-the-range V8 Turbo model and consists of a multifunctional deployable roof spoiler that adapts to the aerodynamic characteristics of the relevant driving condition and features an air-brake function as a highlight.

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Section: Introductionmentioning

confidence: 99%

The aerodynamic development of the new Porsche Cayenne

Wolf¹

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The analysis of isolated wheels has provided an understanding of the flow structures generated by wheel rotation and contact with the moving ground. Analysis has reported on the upper shoulder vortices and jetting vortices from the contact patch [9][10][11][12], which are generated by the oncoming flow reaching the contact region between the wheel and ground. As the flow cannot pass through the contact patch in the case of a slick tyre [9][10][11], static pressure increases rapidly and projects the flow spanwise around the wheel to form the jetting vortices.…”

Section: Introductionmentioning

confidence: 99%

“…Analysis has reported on the upper shoulder vortices and jetting vortices from the contact patch [9][10][11][12], which are generated by the oncoming flow reaching the contact region between the wheel and ground. As the flow cannot pass through the contact patch in the case of a slick tyre [9][10][11], static pressure increases rapidly and projects the flow spanwise around the wheel to form the jetting vortices. Studies by Cogotti [10] and Axon [12] demonstrated the importance of the rotating tyre and contact patch modelling to accurately depict the flow field around the wheel and the relevant forces.…”

Section: Introductionmentioning

confidence: 99%

“…As the flow cannot pass through the contact patch in the case of a slick tyre [9][10][11], static pressure increases rapidly and projects the flow spanwise around the wheel to form the jetting vortices. Studies by Cogotti [10] and Axon [12] demonstrated the importance of the rotating tyre and contact patch modelling to accurately depict the flow field around the wheel and the relevant forces. Inadequate modelling or inadequate representation of this wheelground contact region can influence the description of forces acting on the wheel [10,13].…”

Section: Introductionmentioning

confidence: 99%

“…Studies by Cogotti [10] and Axon [12] demonstrated the importance of the rotating tyre and contact patch modelling to accurately depict the flow field around the wheel and the relevant forces. Inadequate modelling or inadequate representation of this wheelground contact region can influence the description of forces acting on the wheel [10,13]. Previous studies [7,14] have lowered the wheel into the ground plane in order to represent the contact patch, but it generally results in a lack of contact resolution.…”

Section: Introductionmentioning

confidence: 99%

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A Detailed Numerical Study on Aerodynamic Interactions of Tandem Wheels on a Generic Vehicle

Radovic,

Salehi,

Diasinos

2023

Fluids

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Wheels contribute significantly to the aerodynamic performance of ground vehicles. Many studies have focused on investigating a single wheel either in isolation or in a wheelhouse. However, there has been less focus on the flow field around a rear wheel, especially when considering varying proximity to the front wheel, despite its importance on aerodynamic forces. In this study, a generic reference body is modified and fitted with a rear wheel within a wheelhouse and analysed while the wheel spacing varies. Reynolds-Averaged Navier–Stokes (RANS) modelling was employed to allow for multiple variations to be considered and the model produced results in good agreement with experimental results. The results confirm that two upper rear wheelhouse outflow vortices are only present when the wheel spacing is short. It was found that the drag values were minimal for the wheel spacing at a critical distance of 1.5 wheel diameters. At this wheel spacing, the formation of the outboard jetting vortex is prevented at the rear wheel, and hence, the rear wheel drag is reduced by more than 10%. Any further reduction in the spacing does not provide any drag benefits. Also, the outflow from the front wheelhouse is projected further away from the body, drawing flow from the rear wheelhouse into the outboard jetting vortex.

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