Abstract
Bu calismada, modifiye edilerek olusurulmus kamyonetlerin aerodinamik ozellikleri sonlu hacimler metodu ile incelenmistir. Kamyonetler etrafindaki daimi, uc-boyutlu ve turbulansli akislar standart k-epsilon turbulans modeli ile cozulmustur. Acik literaturde bulunan ve deneysel olarak iki-boyutlu-olarak incelenmis bir kamyonet referans alinarak, kasasi uzerinde bir takim modifikasyonlar yapilmistir. Bunun icin, kasanin yanlarinin disinda, ust kismi da duzlemsel bir yuzeyle ortulmustur. Son olarak, kasanin ustu, yanlariyla beraber kamyonet kasasindan kabin ust yuzeyine kadar her tarafindan tamamen kapatilmistir. Yapilan simulasyonlar, referans arac uzerinde yapilan degisikliklerin, direnc katsayisi dikkate alindiginda, araclarin aerodinamik karakteristiklerini iyilestirdigini ortaya koymustur. Orijinal duruma nazaran aracin kabinden kasanin ustune kadar kaplanmasiyla %50, kasanin arka, ust ve yanlarinin kapatilmasiyla %30 ve sadece kasanin arka ve yanlarinin kapatilip ust tarafinin acik birakilmasiyla direnc degerinde, %20 dusus saglanmistir. Direncteki bu azalmalarin sebebi, kasa etrafinda ve kasa ile kabin arasindaki bolgede akis ayrilmasinin onlenmesidir. Kasanin sekli ne olursa olsun, direnc katsayisi Reynolds (Re) sayisinin Re=120103‘e kadar arttirilmasiyla azalmistir. Bu degerden sonra direnc degerleri Re sayisiyla artik cok fazla degismedigi icin bu degerin kritik Reynolds sayisi oldugu gorulmustur.
Highlights
As a subcategory of fluid dynamics, aerodynamics deals with the flow of gaseous, air that passes over the objects like aircrafts, trains, ships, high-rise buildings, wind turbines
The pressure difference created between two edges of the body causes the net aerodynamic force acting on the vehicle to generate a drag against the motion of the vehicle
Three different modifications were done on a reference pickup truck that was found in the open literature
Summary
As a subcategory of fluid dynamics, aerodynamics deals with the flow of gaseous, air that passes over the objects like aircrafts, trains, ships, high-rise buildings, wind turbines. In the present study it is aimed to investigate the aerodynamic performances of some modified pickup trucks by changing their bed designs in terms of pressure contours, flow structure and other non-dimensional numbers such as friction, pressure and drag coefficients. Recent developments in both experimental and numerical techniques enable researchers to deal with the flow around the prototype vehicles, it is still common to work with generic geometries that are very similar to their original counterparts From this point of view, a generic pickup truck that was experimentally studied [1] was taken into account and several modifications were done on its bed to reveal the effects of these structural modifications on the drag coefficients and the flow field for various Reynolds numbers
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