Mesh numbers vary widely depending on the simulation being done and the computational power available. Scale models are usually cheaper to create parts for than a full-scale car and are easier to handle and store. Turn-around time also needed to be relatively quick, on the order of a few days, so that the design could progress and be finalized in the typical three month design cycle of Oregon State University Formula SAE. 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. The disadvantages are that you have to correct for the scale of the vehicle and that often the design used on the scale model will be conservative for the full scale car, meaning that it can be improved more . After 40 design iterations the final undertray can be seen in Figure 4. This is beneficial to the vehicle performance as it will distribute more load to the inside tires, increasing traction.
Marks are awarded for the performance of the vehicle in each of these tests as well as on the fuel economy of the vehicle during the endurance event. For automotive external aerodynamics there are two major areas of testing: 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. It can also be seen that the center of pressure migrates forward with speed. The exit to the wind tunnel is then placed many car lengths behind the geometry and is considered a pressure outlet . Mechanical, Industrial, and Manufacturing Engineering. Flow visualization for on track testing is also limited and can generally only be oil streaking or yarn tufts .
Using this as a starting point, the undertray design was iterated to come to a final design. Robert Paasch Aerodynamic improvements in automotive racing can have a significant effect on vehicle performance.
These vortices can also be used along the sides of the undertray creating a “false seal” that also increases downforce . There is not space in this abstract to include those profiles.
Small variances in things like wind speed, thesjs location and vibration can skew measurements. Pictures from the simulation can be seen in Figure 5 and Figure 6. The angle of the diffuser relative to the ground affects the magnitude of downforce that is created [7, ]. Since the simulation will be of an open wheeled car the tires should be rotating and the ground set to a moving ground or frictionless.
Help Center Find new research papers in: This can be seen in Figure In order to properly capture the data werodynamics car must be equipped with data acquisition and the proper sensors to detect lift, drag and balance .
Figure 7 shows the simulated aerodynamic behavior of the vehicle through speeds that are expected to see during the Formula SAE competition.
Design and Validation of a Front Wing for a Formula SAE car
A tilt test of the vehicle is also performed to simulate cornering and the determination of the height of the centre of gravity of the vehicle. Made available in DSpace on T 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. The boundary conditions were set as follows for the simulations unless otherwise noted: 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.
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 aerkdynamics developed. To move the center of pressure of the undertray or the balance, the low pressure concentration can be moved by changing the aerorynamics of the diffuser entrance more forward or rearward.
The wind tunnel testing of a half-scale model determined that a lift coefficient of Home Graduate Thesis Or Dissertation.
(PDF) AERODYNAMIC DESIGN OF A FORMULA SAE RACE CAR | Fernando Quijije –
When the vehicle is cornering, the body will have a certain yaw angle and will also have some roll. Mechanical, Industrial, and Manufacturing Engineering.
Aerodynamics for Formula SAE: Mechanical, Industrial, and Manufacturing Engineering. The first option would be to just test lap times on a closed course . Also included in the figure are the baseline values of the vehicle without any aerodynamic elements. Figure 4 Final undertray aerdoynamics part alone and part on the car.
Submitted by Karl Jensen jensenka onid.
Like a venturi, the efficiency of an undertray is only as good as the efficiency of the diffuser section . Development of a rolling road wind tunnel research facility for the aerodynamic design of a Formula SAE race car. Computational fluids analysis was used for the design of the body and aerrodynamics of the vehicle.
(PDF) Aerodynamic Undertray Design for FSAE – Thesis | sylvain mbutot –
Jensen, Karl Karl Eugene. As seen in the literature, rotating tires have a significant effect on the flow field around the vehicle. Aerodynamic improvements in automotive racing can have a significant effect on vehicle performance.