FSAE AERODYNAMICS THESIS

FSAE AERODYNAMICS THESIS

Figure 5 shows pressure contours of the full car as well as streamlines that travel under it. Using this as a starting point, the undertray design was iterated to come to a final design. Figure 8 Downforce with change in ground clearance. To move the center of pressure of the undertray or the balance, the low pressure concentration can be moved by changing the location of the diffuser entrance more forward or rearward. A plot of the downforce with speed can be seen in Figure Data collected from the car during the endurance event at the Formula Student Germany competition showed that the aerodynamic package was responsible for a significant increase in the performance of the vehicle under braking and during cornering, while the increase in the drag force had only a minimal effect on the top speed which was achieved during the event. 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.

In this work the literature of undertray technology is presented and a design of an undertray for the Global Formula Racing car is developed. Once it is verified the designers have more confidence in using the simulation as a tool. Aerodynamic improvements in automotive racing can have a significant effect on vehicle performance. Using this lower pressure under the vehicle and the higher pressure on top, downforce can be created. 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. These lap times include 20 laps for each run, however, for statistical analysis the first 5 laps were removed for driver warm-up. 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.

Approved for entry xerodynamics archive by Julie Kurtz julie. Aerodynamics for Formula SAE: 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. Downforce is the vertical force that is produced from aerodynamic loads instead of mass.

fsae aerodynamics thesis

Data collected from the car during the endurance event at the Formula Student Germany competition showed that the aerodynamic package was responsible for a significant increase in the performance of the vehicle under braking and during cornering, while the increase in the drag force had only a minimal effect on the top speed which was achieved during the event.

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As seen in the literature, rotating tires have a significant effect on the flow field around the vehicle. 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.

Figure 11 Full data from straight line test including spring force and speed. 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. 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.

Design and Validation of a Front Wing for a Formula SAE car

Also, since racing is a competitive sport, most of the specific information about undertray design is not published. This means that from an aerodynamic standpoint, less roll is desired to maximize downforce.

Figure 9 Simulation of 5 degree yaw with no roll including pressure contours and streak lines. This vortex flow also adds energy to the flow and will delay separation allowing larger diffuser angles [7, ]. A tilt test of the vehicle is also aerodyanmics to simulate cornering and the determination of the height of the centre of gravity of the vehicle.

fsae aerodynamics thesis

For back-to-back comparisons with and without the undertray an asymmetric oval course was set up. The dynamic fxae aim to test the vehicle in all aspects of competition car performance with acceleration, skid pan cornering, autocross and a final twenty-two kilometre endurance test. In this work the literature of undertray technology is presented and a design of an undertray for the Global Formula Racing car is developed.

Flow visualization for on track testing is also limited and can generally only be oil streaking or yarn tufts [10].

The complexity of the CAD geometry depends on what is of interest from the data and how much computing power is available. Figure 6 Bottom view of undertray with pressure contours and steak lines.

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A mesh refinement study was conducted and it was determined, given the computational power available, that the optimal mesh for the study of the thezis and under-tray consisted of approximately 1.

These elements come in many forms, but the major contributors to downforce are inverted wings and underbody diffusers. Since the underbody of the car is of most interest, some sort of boundary layer control needs to be used. In this work the literature of undertray technology is presented and a design of an undertray for the Global Formula Racing car is developed.

Using this as a starting point, the undertray design was iterated to come to a final design. Once separation occurs the downforce is reduced and drag is greatly increased [10].

Design and Validation of a Front Wing for a Formula SAE car

Scale models are usually cheaper to create parts for than a full-scale car and are easier to handle and store. Help Center Find new research papers in: The competition comprises both static and dynamic events. The disadvantages are that you have to aeerodynamics 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 [9]. Submitted by Karl Jensen jensenka onid.

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. The boundary conditions were set as follows for the simulations unless otherwise dsae Half-scale modelling using the wind tunnel rolling road facility gave a aeroodynamics coefficient of 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 [9].

It is clearly evident that the downforce is increased as the mass flow rate and gas temperature increase. thsis

fsae aerodynamics thesis