Jensen, Karl Karl Eugene. There is not space in this abstract to include those profiles. According to the data, the majority of the downforce seems to be produced at the rear. 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. Computational fluids analysis was used for the design of the body and under-tray of the vehicle. Hammond A large amount of wind tunnel testing was carried out including:
Enter the email address you signed up with and we’ll email you a reset link. The boundary conditions were set as follows for the simulations unless otherwise noted: Aerodynamic improvements in automotive racing can have a significant effect on vehicle performance. The exit to the wind tunnel is then placed many car lengths behind the geometry and is considered a pressure outlet . Home Graduate Thesis Or Dissertation. For back-to-back comparisons with and without the undertray an asymmetric oval course was set up. Home Graduate Thesis Or Dissertation.
Skip to main content. Made available in DSpace on T Figure 5 shows pressure contours of the full car as well as streamlines that travel under it.
My signature below authorizes release of my thesis to any reader upon request. The boundary conditions were set as follows for the simulations unless otherwise noted: For automotive external aerodynamics there are two major areas of testing: You do not have access to any existing collections.
In order to properly capture the data the car must be equipped with data acquisition and the proper sensors to detect lift, drag and balance . For external aerodynamics there is a “wind tunnel” box that is placed around the model. Once it is verified the designers have more confidence in using the simulation as a tool.
Design and Validation of a Front Wing for a Formula SAE car
Half-scale modelling using the wind tunnel rolling road facility gave a lift coefficient of Like a venturi, the efficiency of an undertray is only as good as the efficiency of the diffuser section .
These numbers were chosen based from the literature of what the CFD simulations would predict with the resources available. This work has no parents. Full details of the effect of adding the aerodynamic features, and a comparison with the CFD and wind tunnel test predictions will be given in the full paper. Wind tunnel testing fssae broken down into two areas of full-scale testing and model testing.
It can be seen that with small changes in ride height there are large changes in aerodynamic loads.
Downforce is the vertical force that is produced from aerodynamic loads instead of mass. The problem that occurs however is that there are complex interactions between all parts of the undertray as well as the car body, making design an uncertain area. The test calculated a p- value of 0. arodynamics
(PDF) Aerodynamic Undertray Design for FSAE – Thesis | sylvain mbutot –
Figure 11 Full data from straight line test including spring force and speed. The drag coefficient also varied from 0. Click here to sign up. You may create a new collection.
You may create a new collection. In this work the literature of undertray technology is presented and a design of an undertray for the Global Formula Racing car is developed. For this case the downforce increased to 62 pounds and it can also be seen in the figure that it will cause a roll moment on the car that will want to roll the car into the corner. From Figure 14 it can be seen that the lap times with the undertray are faster than without.
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 . Initial design and performance prediction. Two of the three available axes from the accelerometer were utilised to determine the braking, acceleration and cornering performance of the vehicle. Aerodynamics for Formula SAE: This can lead to a stabilizing effect at higher speeds but also means that the car will become less responsive and have a tendency to understeer.
The effect of vehicle ride height can be seen in Figure 8. Jensen, Karl Karl Eugene.
The first option would be to just test lap times on a closed course . Scale models are usually cheaper to create parts for fhesis a full-scale car and are easier to handle and store.