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In this study the aerodynamic characteristics of 1/32 scale truck and trailer model were examined in a wind tunnel. The acting drag force to model truck and trailer combination is calculated and aerodynamic drag coefficient is determined. The wind tunnel tests were carried out in the range of 159 000 -453 000 Reynolds numbers. In order to improve the aerodynamics structure of truck-trailer, one spoiler, one passive air channel and three different redirector is produced in three dimensional printer. These aerodynamic parts respectively added to base truck-trailer model and obtaining aerodynamic improvement rates compared. According to wind tunnel test results, the aerodynamic improvement rates are respectively 14.78%, 18.06%, 23.15%and 20.70%. The lowest drag coefficient was determined as 0,584on model-3 of truck-trailer model.

Bir otobüs modeli etrafındaki akış yapısının CFD yöntemi ile incelenmesi ve sürükleme kuvvetinin pasif akış kontrol yöntemi ile iyileştirilmesi The investigation of flow characteristic around a bus model by CFD method and improvement of drag force by passive flow control method Yazar(lar)

In this study, aerodynamic structures of the heavy vehicle consisting of truck and trailer was investigated with computational fluid mechanics method. The force measurement were performed on the model car and aerodynamic drag coefficient (CD) were determined numerically in 4 different speeds on the Fluent® program. Numerical analysis of flow were made on the 59 000 -844 000 Reynolds number. The effect of trailer additional to truck was determined to aerodynamic drag coefficient. The friction and pressure induced distributions were determined of total aerodynamic resistance. The images of flow structure were obtained around the truck trailer. The zones that was forming aerodynamic resistance were determined.

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