# Drag Reduction System In Automobile

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Numerical Analysis of Drag Reduction System in Automobile ABSTRACT Aerodynamic drag plays a very vital role in speed and stability of the automobile. Too much drag reduces the speed and efficiency while too little drag creates very much instability in the vehicle. DRS or drag reduction system is a very useful tool in formula one motoracing where they use it to reduce drag & gains speed advantage. Hence this article is concentrated on analysis of drag reduction with different speed of the formula one car numerically. A rear wing model which is a very vital part of the DRS is designed using CATIA Vr520 software and simulating analysis is made using ANSYS 14.0 software. With a mesh relevance of +30000,…show more content…
Here more wing angle and surface creates more down force which in turn reduces speed. But here the rear wing is splitted into two set of aerofoil which is connected to each other. The upper aerofoil is one large single element whereas the lower one is responsible for creating down force. The lower wing when tilted to a certain angle which creates a low pressure region to create more down force below the car. The position of two wings should be relative to each other as if they were very close then the resultant force will be in opposite direction and thus cancel each other. Two wings produce more down force as the lift coefficient increases and the drag decreases. Table 1. Calculated value of Air Resistance Determination of Air Resistance Air resistance is the resistance offered by air to the movement of a vehicle. The air resistance has an influence on the performance, ride and stability of the vehicle and depends upon the size and shape of the body of the vehicle, its speed and the wind velocity. The last term should be taken into account when indicated, otherwise it can be neglected. Hence in general, air resistance is calculated as shown [10], Ra = Ka AV2 A = Projected Frontal Area,…show more content…
Wings in closed position. The rear wing is designed by using the modelling software CATIA Vr5. In modelling the time is spent in producing the complex 3-Dimensional models and the risk involved in design and manufacturing process is minimised. While designing, a gap of 10.51 mm is left between both end edges of the wings which shows the wings are in closed position i.e. DRS is Off (fig 1). Similarly another wing is designed having a gap of 50 mm between both end edges which shows the wings are in opened position i.e. DRS is On (fig 2). The wing length is kept constant i.e. 1650 mm. Later both the wings are imported to ANSYS software for analysis work. ANSYS 14.0 software has the latest CFD used for simulating the air flow. The file is imported from CATIA to ANSYS by saving it in .igs format. The imported model is meshed having a mesh relevance of +30,000. After constraining the meshed model, it is subjected to boundary conditions and an air pocket is created to simulate the air flow inside it. Air velocity of 320 km/hr, 300 km/hr and 280 km/hr are striked over both the designed wing surface. A solver mode in ANSYS calculates the result without