Cfd Analysis On Aerodynamic Effect Of Spoiler On Toyota Hiace Midibus Car

Abstract

Most Of The Vehicle In Modern Time Have A Problem In High-Speed Driving In Which Car Balance, Fuel Efficiency, Better Environment Is A Major Criterion For Car Manufacturers. When A Vehicle Travels From Place To Place The Fuel Consumption Is Affected By The Aerodynamic Drag, Lift Weight, Side Forces And Thrust. A Large Percentage Of The Usable Fuel Is Employed In Overcoming The Aerodynamic At Highway Speeds And Therefore If Reduced Could Produce A Large Reduction In The Total Fuel Consumption And Reduce The Negative Environmental Effects. There Are Many Vehicles Used In Ethiopia For Transporting Goods And Peoples From Place To Place. Toyota Hiace Midibus (Dolphin) Is One Of The Many Vehicles That Are Used In Ethiopia For Transportation. The Main Objective Of This Thesis Work Is To Study The Effect Of Spoiler On Aerodynamic Performance Of The Toyota Hiace Midibus (Dolphin) In Order To Improve The Overall Aerodynamic Behaviour Of The Vehicle. The Analysis Were Performed Using Spoiler With Different Angle Of Inclination By Computational Fluid Dynamics (Cfd). A Baseline Model Of The Vehicle Modeled With Solid Works With Scale Of 1:12 Was Analyzed At Various Speeds And Improvement In Drag Coefficient And Lift Coefficient Were Obtained In Models With Spoiler When Compared To The Baseline Model Without Any Add-On Device. A Drag Reduction Of 15.21%, 3.44% And 2.02% Was Achieved On Spoiler With 0 , 8, 12 Angle Inclination Respectively When Compared To The Baseline Model. Because Of The Reduced Drag, The Fuel Consumption Was Reduced By 9.12%. The Lift Coefficient Of The Baseline Was Also Reduced By 65.9%, 33.87% And 26.43% For Spoiler With 8 ,12, 0 Angle Of Inclination Respectively At 120 Kmh. This Reduction In Lift Coefficient Increases The Vehicle Stability At Higher Speed. The Overall Aerodynamic Performance Of The Vehicle Improved Using Spoiler As An Add On Device Which Lead To Better Fuel Economy And Stability Of The Vehicle.