Drag Reduction in the Sedan Car by Implementing Diffuser to Improve the Fuel Efficiency

This paper focuses on studying the effect of diffuser in improving the fuel economy by reducing drag force and also improving the vehicle stability. Due to complex geometry (presence of axles, exhaust pipes, etc.), we tend to neglect the underbody of the sedan car. But, due to the irregular projections, drag is created. To reduce drag, we introduce diffuser which increases fuel economy. In the upcoming decade, electric cars will dominate the automobile industry. Introducing diffuser will serve its purpose irrespective of its type. In this paper, four different ramp angles are taken, and its effect is studied using computational fluid dynamics (CFD). Simulations are done on a sedan type car model (Honda city). By attaching diffuser with increased length from the body and various angles are studied at that length, it is found that the drag force is significantly reduced, and also the vehicle stability is improved.