Aerdynamic thesis

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Aerdynamic thesis

The aerodynamics of a container freight train - eTheses Repository

Robert Paasch Aerodynamic improvements in automotive racing can have a significant effect on vehicle performance.

Recent developments in Formula SAE Society of Automotive Engineers have included the design and implementation of aerodynamic devices such as inverted wings and undertrays to improve performance. In this work the literature of undertray technology is presented and a design of an undertray for the Global Formula Racing car is developed.

Computational Fluid Dynamics simulations are used to iterate the design and discover the effect on the downforce developed of various vehicle parameters such as speed, ride height and roll.

Aerdynamic thesis

Predicted performance is then tested using on-track data and statistical analysis is preformed on lap times from a back-to-back comparison to identify the gain of the undertray. My signature below authorizes release of my thesis to any reader upon request.

Robert Paasch for his support and advice throughout this work as well as the Global Formula Racing team for their support of the project.

I would also like to thank my committee members for their time and expertise. Since the competitions inception inthe cars have been evolving and changing and there has been no single design that stands out as "the best.

Theoretical Fluid Dynamics and Turbulence Group

One development that seems to be more common of late is the use of downforce producing aerodynamic elements []. Downforce is the vertical force that is produced from aerodynamic loads instead of mass.

A tires coefficient of friction will decrease with added vertical force. This means that a lightweight car will be able to make more efficient use of its tires than a heavier car and will be able to accelerate faster in any direction.

Aerodynamic elements, however, produce vertical load on the tires with very little added mass, giving the tires more grip and allowing the car higher acceleration [7].

These elements come in many forms, but the major contributors to downforce are inverted wings and underbody diffusers. Design of aerodynamic elements for race cars is complex due to the body interactions between the elements and the car, wheels, etc, and has in the past been mostly an experimental science [7, 8].

Recent developments in computational fluid 2 dynamics CFD and also computer technology have allowed the simulation of aerodynamics to accurately predict the downforce, flow patterns and many other features of the air flow around the vehicle. This simulation can greatly reduce the cost and time needed to test aerodynamic elements.

In this work the design of a Formula SAE undertray is developed using CFD and verified with on-track testing to determine actual vehicle performance increase. Like a venturi there is a nozzle that increases the velocity of the air underneath the vehicle, a throat where the maximum velocity is reached and a diffuser where the air is slowed back down to free stream velocity.

Bernoulli's Equation shows us that as the local velocity increases relative to the free stream velocity the local pressure is decreased. Using this lower pressure under the vehicle and the higher pressure on top, downforce can be created.

Like a venturi, the efficiency of an undertray is only as good as the efficiency of the diffuser section [12]. Due to its high visibility relative to the rest of the undertray, there are some common misconceptions in the race car industry to how a diffuser works [10].

First is that the diffuser is what actually creates all of the downforce of the undertray and second is that the diffuser expands the air under the 3 vehicle causing lowered pressure.

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Both of these concepts are false since the role of the diffuser is to slow the air under the vehicle back down to free stream to reduce the drag and increase the overall undertray efficiency, and as it is an open system with gaps around the edges it is unable to expand the air to cause a density change.

With these things in mind, it is the diffuser angle and entrance location that drives the undertray performance.

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The location of the entrance of the diffuser greatly affects where the low pressure occurs on the vehicle undertray.+= sn THE PRACTICAL CALCULATION OF THE AERODYNAMIC CHARACTERISTICS OF SLENDER FINNED VEHICLES by James. S.

Aerodynamics (Mechanics of Flight)--Science Tracer Bullet

Barrowman A Dissertation Submitted to the Faculty of the School of Engineering The basic objective of this thesis is to provide a practical method of . In the present thesis, the effect of tunnel length on the flow and pressure inside is investigated. The investigation uses computational fluid dynamics techniques (CFD), in .

With these results and the predictive tool, the in-house capability at the Naval Postgraduate School to generate such data for future missile designs has been successfully enhanced.

Our research in aerodynamic design is in the development of design methods and their application to the design of flight vehicles, ground vehicles, and wind power devices. We have developed design approaches and methods for natural-laminar-flow (NLF), low Reynolds number, and high-lift airfoils.

the aerodynamics of the knuckleball pitch: an experimental investigation into the effects that the seam and slow rotation have on a baseball by. aerodynamic properties of bicycle wheels in the wind tunnel, namely translational drag, rotational drag and side force.

Both disk wheels and spoked wheels were tested. It was found that disk wheels of different hub widths have different aerodynamic properties with the 53mm wide Zen disk wheel requiring the lowest total power of the wheels tested.

aerdynamic thesis - Dormitory