Improving The Aerodynamic Performance Of Midi Bus Passenger Vehicle Using A Rear End Spoiler (Using CFD)

Abstract

When A Body Is Moving Through Air It Faces A Resistance Force Which Is Acting In The Direction Opposite To The Direction Of Motion Of A Moving Body, Which Is The Aerodynamic Drag. The Primary Reason Of This Study Is To Improve The Aerodynamic Performance Of Toyota HiaceMidi Bus Vehicle By Adding A Spoiler At Different Angle At The Rear End Of The Existing Car Model Without Changing Its Body Styling Which Will Result In Better Aerodynamic Performance Than The Existing Car Model. Both Computational Fluid Dynamics (Cfd) And Experimental Approaches Are Applied To Analyze The Turbulence Features Which Will Result In A Better Aero dynamic Performance Than The Baseline Model. Solid work Flow Simulation Is Used ToPerform The Computational Analysis Which Is Later Verified By Wind Tunnel Testing Of The Baseline Model. A 1/10 Scaled Down Generic Toyota Hiace Midi Bus Model That Is Modeled With Solid Work Was Used As The Base Line Model. Improvement In Drag Coefficient Were Obtained In Models With Spoilers Adjusted At Zero Degree But This Resulted In An Increase In Lift Coefficient Than The Baseline Model. A Drag Reduction Of 0.255% Was Achieved In Model One But The Lift Coefficient Increases Than The Baseline Model By 3.454%. Model Two With A Spoiler Having A Gap Of 5 Cm Adjusted At Zero Degree Was Used And It Resulted In An Increase In Aerodynamic Drag By 3.5% But It Resulted Decrement In Aerodynamic Lift By 46.19% Than The Baseline Model. Model Three A Spoiler Adjusted At 5 Degree Reduces The Aerodynamic Lift By 63% Which Is Better Than Model Two And The Resulted Increase In Drag Coefficient Was4.95% Which Is Slightly Higher Than Model Two. Model Four Spoiler Adjusted At 10 Degree Reduces The Lift Coefficient By 99.975% Which Is Higher Than All The Models But The Resulting Increase In Drag Coefficient Was Almost Increase In Double Than Model Two Which Is7.32%.Model Two Is The Preferred Model Because Of It Has A Better Improvement In Lift Coefficient Without Affecting Significantly The Drag Coefficient