Author(s): Md. Rezaul Karim Sikder and Mohammad Zoynal Abedin

Abstract: Due to higher prices, limited supply and negative impacts on the environment by fossil fuel, automobile industries have directed their concentrations in reducing the fuel consumption of vehicles to achieve the lower aerodynamic drag. As a consequence, numerous researches have been carried out throughout the world for getting the optimum aerodynamic designs with lower drag and decreases fuel consumption. Hence, experimental investigation has been done for various passenger bus models using a wind tunnel. Two demo base models are considered for the analysis namely model-1 made of a plastic body and model-2 made of metal body. Some extensive modifications are done in the bus body such as the front and rear side area which helps to reduce the aerodynamic drag of the bus. The experimental analysis for the drag forces, drag coefficient and fuel consumption have been done for model-1 & 2 as well as for their respective modified models. For base model-1, the drag force is reduced as 0.027 N, the drag coefficient, Cd is reduced as 0.30 and fuel savings 19.50%. For base model-2, the drag force is reduced as 0.062 N, the drag coefficient, Cd is reduced as 0.37 and fuel savings 22.20%.

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