Aerodynamic Effects of Indy Car Components

Katz, Joseph; Garcia, Darwin

doi:10.4271/2002-01-3311

Cited by 20 publications

(18 citation statements)

References 6 publications

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“…The experiments by Diasinos and Gatto were detailed enough to allow useful validation of the present numerical approach in terms of choice of turbulence model to describe the complexities of the wake, despite the scale being an order of magnitude below that of an actual racing car (25) . Subsequent to this, a full-scale wing and wheel model was constructed to investigate the flow features at a more appropriate Reynolds number.…”

Section: Geometry and Setupmentioning

confidence: 99%

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On the interaction of a racing car front wing and exposed wheel

Diasinos

Doig

Barber

2014

Aeronaut. j. (1968)

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A numerical investigation of generic open-wheel racing car wing and wheel geometry has been conducted, using original sub-scale experimental data for validation. It was determined that there are three main interactions that may occur, identifiable by the path that the main and secondary wing vortices take around the wheel. Interaction 'A' occurs when the main and secondary wing vortices both travel outboard of the wheel; interaction 'B' is obtained when only the main wing vortex passes inboard of the wheel; while interaction 'C' sees both wing vortices travel inboard of the wheel. The different interactions are achieved when geometric changes to the wing affect the pressure distribution about the endplate, either by altering the magnitude of suction generated by the wing or by changing the locations of peak suction and vortices relative to the wheel's stagnation regions. As a result, the influence that the wing and wheel have on each other -in comparison to the same bodies in isolation -varies, resulting in significant consequences for downforce and drag.

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Section: Geometry and Setupmentioning

confidence: 99%

“…An experimental investigation of open-wheeler aerodynamics was conducted by Katz (25) , including the effect of increasing front wing downforce on total vehicle downforce of a 25% scale model. An elevated ground rather than a rolling road was used to represent the ground.…”

Section: Introductionmentioning

confidence: 99%

On the interaction of a racing car front wing and exposed wheel

Diasinos

Doig

Barber

2014

Aeronaut. j. (1968)

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“…Although these types of wings are exposed to the undisturbed freestream, their interaction with the vehicle is not always linear. Katz & Garcia (2002) reported one of the more complicated front wing/vehicle interactions. This wind tunnel study, with moving and stopped ground plane, focused on open-wheel (Indytype) race cars, and the generic shape of the front wing with flaps is shown in the upper inset to Figure 7.…”

Section: Figurementioning

confidence: 99%

“…Circular symbols represent vehicle total loads and square symbols represent loads on the front wing only. [Reprinted with permission from Katz & Garcia (2002), SAE Paper 2002-01-3311 c 2002 the distance between the two front wheels. However, earlier (unpublished) studies show an unfavorable interaction between the wing-tip vortices and the wheels, clearly favoring the narrower wing-span design.…”

Section: Figurementioning

confidence: 99%

Aerodynamics of Race Cars

Katz

2006

Annu. Rev. Fluid Mech.

Self Cite

196

118

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Race car performance depends on elements such as the engine, tires, suspension, road, aerodynamics, and of course the driver. In recent years, however, vehicle aerodynamics gained increased attention, mainly due to the utilization of the negative lift (downforce) principle, yielding several important performance improvements. This review briefly explains the significance of the aerodynamic downforce and how it improves race car performance. After this short introduction various methods to generate downforce such as inverted wings, diffusers, and vortex generators are discussed. Due to the complex geometry of these vehicles, the aerodynamic interaction between the various body components is significant, resulting in vortex flows and lifting surface shapes unlike traditional airplane wings. Typical design tools such as wind tunnel testing, computational fluid dynamics, and track testing, and their relevance to race car development, are discussed as well. In spite of the tremendous progress of these design tools (due to better instrumentation, communication, and computational power), the fluid dynamic phenomenon is still highly nonlinear, and predicting the effect of a particular modification is not always trouble free. Several examples covering a wide range of vehicle shapes (e.g., from stock cars to open-wheel race cars) are presented to demonstrate this nonlinear nature of the flow field.

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“…Katz [18] published a work regarding the incorporation of vortex generators onto the ends of the underbody of an Indycar. In it he graphically represented his data from Katz et al [19,20] which shows that the lift of the car was very low at low ride heights about and the drag coefficient was reduced from 0.2 to 0.18 with addition of vortex generators.…”

Section: Vortex Generatormentioning

confidence: 99%

CFD Analysis of Car Body Aerodynamics Including Effect of Passive Flow Devices – A Review

Ahmed¹

2016

IJRET

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With the emphasis lying on increasing fuel efficiency of vehicles in order to combat rising fuel prices and environmental challenges the manufacturers are thinking beyond the conventional vehicle systems by focusing on its aerodynamics. Aerodynamic drag exceeds 50 per cent of the total resistance to motion at speeds above 70km/hr, and above 100 km/hr it is the most important factor. The review is done to identify the various shortcomings of the automotive designers when it is in regards to flow separation of air at the rear of the vehicle which causes most of the losses. This paper focuses on the work already done in the field of aerodynamics starting with Ahmed Body. It is a bluff body with adjustable rear slant angle and the basis upon which the aerodynamicists test their models. And then, moving onto passive aerodynamic enhancements for automobiles like vortex generators and diffusers whose various dimensional modulations were discussed with several steps leading to its advancement in vehicle body design. This brings to the simulation, Computational Fluid Dynamics (CFD) and its role in this analysis was covered. CFD has been modified a lot from the beginning to increase the accuracy of its predictions. So the paper lists various simulation techniques studied by the previous researchers in order to understand the wake region behind the car which has been notoriously difficult to predict till date. Several aspects of aerodynamic drag that need further analysis to improve the aerodynamic were highlighted.

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Aerodynamic Effects of Indy Car Components

Cited by 20 publications

References 6 publications

On the interaction of a racing car front wing and exposed wheel

On the interaction of a racing car front wing and exposed wheel

Aerodynamics of Race Cars

CFD Analysis of Car Body Aerodynamics Including Effect of Passive Flow Devices – A Review

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