CFD DEPARTMENT

DESIGN AND IMPLEMENTAION OF AERODYNAMIC DEVICE IN AUTOMOBILES TO INCREASE MILEAGE

 

Scope of Project:

The usage of automobiles is in predictable in day to day life which is common among people for travelling in Indian economic condition. More Indian families prefer family cars like Tavera, Innova, Qualis, ECT… for long drives. But, these family cars provide less mileage when compared to sedan class and small cars. In order to increase the mileage of car we have implemented aerodynamic device which is known as cut section of wing on ceiling of a car. When the car is in motion at the average speed of about 120km/hr the aerodynamic device generates sensible lift force which tries to pull the car from ground and the weight of car acts downwards which pushes the car towards ground. Each force cancel each other and the net force will be the subtraction of lift force generated by aerodynamic device and this would reduce Gross Vehicle Weight. By the known phenomena Miles Per Gallon of a vehicle which can be improved by reducing the GVW.

 

Geometry and Mesh:

The different retro fitting model geometry designed with Catia Design software.

 

Fig: Aerodynamic Model of Vehicle without Retro Fitting

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig: Aerodynamic Model of Vehicle with Retro Fitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Analysis:

The CFD simulation carried out on Vehicle with different retro fitting model. Sequent optimization had done step by step until the required lift force generation.  

 

Fig: Streamline flow over on Flap wing with vehicle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig: Streamline Flow over on Split Flap Retro Fitting on Vehicle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig: Streamline over on Modified Aerofoil flap Retro Fitting on Vehicle.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Conclusion:

Reducing GVW and recirculation zones on car will leads to fuel economy are known phenomena. Hence, the analysis results from ANSYS CFX software confirm the above statement and reflect that our AD is capable to reduce GVW and recirculation zones behind the car. At the same time fuel economy gained on car by this device will be affected by drag force generated on AD. From the analysis reports we found that drag produced by AD is in the form of induced drag which can be eliminated by drag reducing techniques (especially we can eliminate induced drag by designing AD with Winglets). If drag on AD is reduced we can surely get even better fuel economy on automobiles in the history. We hope that our project will become a grand success and implemented on all automobiles in the future.