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    Experimental and numerical studies on improvement of drag force of a bus model using different spoiler models
    (Inderscience Enterprises Ltd, 2020) Cihan, Bayindirli; Erkan, Akansu Yahya; Mehmet, Celik
    The purpose of this paper is to reduce the drag force of a bus model by using four different spoiler models. The tests carried out at six different free stream velocities and in the range of 3.8 x10(5) - 7.9 x10(5) Reynolds numbers. The drag coefficient (CD) of the bus model was determined as 0.633 in a wind tunnel and 0.645 in Fluent (R) package program. The first spoiler model consists of a combination of airfoil and vortex generator mounted at five different locations (L/H) on bus model to improve the drag force. The drag reduction was obtained in the range of 12.25-4.35% in five different L/H rates by using spoiler 1 model. The spoiler 2 model has airfoil shape and maximum drag coefficient was improved by 3.34% experimentally. A 23.49% reduction was obtained by using spoiler 3 in L/H = 0.1 and 18.49% reduction by using spoiler 4 in L/H = 0.15. The numerical flow analyses were performed at the same wind tunnel conditions at six free stream velocities for the base model and best results for each spoiler model. The drag coefficients of best models were reduced by 11.48% and 8.59%, 15.90% and 19.05% respectively in Fluent (R).
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    Numerical Drag Reduction of a Ground Vehicle by NACA2415 Airfoil Structured Vortex Generator and Spoiler
    (Korean Soc Automotive Engineers-Ksae, 2019) Cihan, Bayindirli
    Using of computational fluid dynamics (CFD) have big advanteges for design process components in the automotive industry. Flow structures around vehicle and drag forces can investigate in CFD without producing real size prototype vehicle. The drag force affect fuel efficiency and drivability too. In this study, the drag coefficient of 1/15 scale minibus model was minimizated by NACA 2415 airfoil structured vortex generator and front spoiler in Fluent (R). Flow analyses were performed at the 5 different free stream velocities in the range of 2.8 x 10(5)-6.6 x 10(5) Reynolds numbers, where the dynamic similarity condition was provided. The drag coefficient of base minibus model was 0.415. The C-D coefficient of the model minibus was decreased 10.94 % with original designed NACA 2415 airfoil structured vortex generator in model 1. In total of 22.59 % drag reduction was obtained by designed front spoiler. The effect of this drag reduction on fuel consumption about 6 12 % at high vehicle speeds.