The entrance to the wind tunnel is placed a few car lengths ahead of the geometry and is considered a velocity inlet [ 19]. Flow visualization for on track testing is also limited and can generally only be oil streaking or yarn tufts . A tires coefficient of friction will decrease with added vertical force. The total marks received from both the static and the dynamic events determine the overall winner of the competition. Data were collected from the four acceleration runs undertaken at the Formula Student Germany competition.
Starting at the diffuser entrance there is a vortex that forms that travels down the length of the diffuser. In this work the literature of undertray technology is presented and a design of an undertray for the Global Formula Racing car is developed. Help Center Find new research papers in: 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. Mesh size was chosen such that all detail of the vehicle was accurately captured and overall cell count was on the order of a million.
There appears to be four major turbulence models that are used in the automotive industries: This extra room was to insure that the boundary conditions could be met with the geometry of the vehicle included. This could be aerodynqmics the simulations lack to accurately model drag. Aerodynamics of High Performance Vehicles.
Jensen, Karl Karl Eugene. Imported CAD geometry was used for all surfaces.
From the literature review it was found that the simulation aerodynamiics the tires was important to the accuracy of the rest of the model [5, ]. The solution to the simulation can be used to observe pressure, velocity, downforce, drag and aerodunamics other fluid properties of interest. A mesh refinement study was conducted and it was determined, given the computational power available, that the optimal mesh for the study of the body and under-tray consisted of approximately 1.
These simulations fsze be very beneficial to the designer as they can give visual aids and data of the interactions that are occurring as well as flow trends that were not thought about before. Recent developments in Formula SAE Society of Automotive Engineers have included the design aerovynamics implementation of aerodynamic devices such as inverted wings and undertrays to improve performance.
I would also like to thank my committee members for their time and expertise. This means that the car could become unstable at higher speeds and the center of pressure may need to be adjusted with add-ons such as gurney flaps on the rear of the diffusers or dive plates in the front. Submitted by Karl Jensen jensenka onid. Master of Science M. Figure 1 Simulation geometry with labels. Downforce is the vertical force that is produced from aerodynamic loads instead of mass.
(PDF) AERODYNAMIC DESIGN OF A FORMULA SAE RACE CAR | Fernando Quijije –
Large vortex generators can be placed at the entrance of the undertray so that the vortices travel along the length of the vehicle, reducing the pressure and increasing downforce [, 14]. Flow visualization for on track testing is also limited and can generally only be oil streaking or yarn tufts . Home Graduate Thesis Or Dissertation. As seen in the literature, rotating tires have a significant effect on the flow field around the vehicle.
Figure 6 Bottom view of undertray with pressure contours and steak lines. Vortices can also be used on other parts of the undertray. The simulations show that there is a significant increase in downforce with only a small increase in drag.
There is not space in this abstract to include those profiles. It was the goal of the present research fssae determine areas where the aerodynamic forces are most performance enhancing by utilising CFD as well as model testing in a wind tunnel equipped with a moving belt ground plane, and then to validate the predictions using on-road measurements.
The difference between the means of the two tests is 0.
The drag coefficient also varied from 0. Design of aerodynamic elements for race tsae 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]. Figure 9 Thfsis of 5 degree yaw with no roll including pressure contours and streak lines. Little work has been published using CFD to help design a Formula SAE car [2,15], and most of the work has been in 2-dimension simulation of airfoils.
Design and Validation of a Front Wing for a Formula SAE car
Figure 8 Downforce with change in ground clearance. Computational fluids tthesis was used for the design of the body and under-tray of the vehicle. Since the airflow around a race car is very turbulent, a model needs to be selected for simulation of the turbulent flow.
For a race car, balance is critical to vehicle performance due to its effects on understeer and oversteer characteristics .
The first option would be to just test lap times on a closed course . Approved for entry into archive by Laura Wilson laura.