The Determination Of Aerodynamic Drag Coefficient Of Truck and Trailer Model By Wind Tunnel Tests

Öz

In this study, surface pressure and drag measurements were conducted for a heavy vehicle model consisted of 1/32 scaled truck and trailer which was placed in a wind tunnel. The wind tunnel tests of truck trailer combination were carried out in the range of 117 000 - 844 000 Reynolds numbers. The pressure coefficient (CP) distribution and aerodynamic drag coefficient (CD) on truck and trailer were experimentally determined. The regions forming aerodynamic drag on the truck trailer was determined at the result of the flow visualization. The average drag coefficient (CD) was determined as 0.608 for truck. The drag coefficiens was obtained as 0,704 for truc trailer combination. The drag coefficient (CD ) increased 15.8%, when the trailer was attached to the truck.

Anahtar Kelimeler

• The aerodynamic drag coefficient,wind tunnel,aerodynamic,drag force,pressure coefficient,drag force

Kaynakça

1. Wood, R.M. and Bauer, S.X.S. (2003). Simple and low cost aerodynamic drag reduction devices for tractor-trailer Trucks. SAE Technical Paper, 01–3377, 1-18.
2. Çakmak, M.A," Investigation of vehicles as aerodynamically”, Mühendis Makina, 41, 489, 2000.
3. Wahba, C. E.M., Al-Marzooqi, H., Shaath, M., Shahin, M., and El-Dhmashawy. T. (2012). Aerodynamic Drag Reduction for Ground Vehicles using Lateral Guide Vanes. CFD Letters Vol. 4(2), 68-78.
4. Gilhaus, A, “The influence of cab shabe on air drag of trucks”, Journal of Wind Engineering and Industrial Aerodynamics, 9, 77-87, 1981.
5. Chowdhury, H, Moria H, Ali A, Khan I, Alam, F, Watkins, S, “A study on aerodynamic drag of a semi-trailer truck” 5th BSME International Conference on Thermal Engineering Volume 56, Pages 201–205, 2013.
6. Miralbes, R, “Analysis of Some Aerodynamic Improvements for Semi-Trailer Tankers” Proceedings of the World Congress on Engineering Vol 3 WCE, 4-6 July, London U.K, 2012.
7. Çengel, A, Y, Cimbala J, M, “Fluid Mechanics Fundamentals and Applications”, (Translater. Tahsin Engin, H. Rıdvan Öz, Hasan Küçük, Şevki Çeşmeci), Güven Bilimsel, İzmir, 2008.
8. Sahin C, “Prediction of Aerodynamic Drag Coefficient for Heavy Vehicles with Computational Fluid Dynamics Method” İstanbul Technical Universty, Institute of Science and Technology, Master Thesis, 2008.

9. Apisakkul, K.T., and Kittichaikarn, C. (2005). Numerical analysis of flow over car spoiler. Paper presented The Ninth Annual National Symposium on Computational Science and Engineering Papers ANSCSE-9, Bangkok, Thailand.
10. Desai M., Channiwala S. A., Nagarsheth, H. J. (2008). Experimental and Computational Aerodynamic Investigations of a Car. WSEAS Transactions on Fluid Mechanics Issue 4, Volume 3, 359-366.
11. Hu, Xu-xia., and Wong, E.T.T. (2011). A Numerical Study On Rear-spoiler Of Passenger Vehicle. World Academy of Science, Engineering and Technology, 57, 636-641.
12. Lokhande, B., Sovani, S., and Khalighi, B. (2003). Transient simulation of the flow field around a generic pickup truck. SAE Technical Paper Series, 01-1313, 1- 19.
13. Perzon, S., and Davidson, L. (2000). On transient modeling of the flow around vehicles using the Reynolds equation. International Conference on Applied Computational Fluid Dynamics (ACFD) Beijing China, 720-727.
14. Vaghela, K. (2013).Optimization of Roof Fairing Angle to Reduce the Aerodynamic Drag of Heavy Duty Truck. International Journal of Emerging Technologies in Computational and Applied Sciences IJETCAS, 13-322, 113-117.
15. Solmaz, H., İcingur, Y. (2015). Drag Coefficient Determination Of A Bus Model Using Reynolds Number Independence, IJAET, 4 (3) 146-151.
16. Sarı, M,F. (2007). The Aerodynamic Analysis of Air Resistance Affecting the Front Form of Light Commercial vehicles And Its Effect on Fuel Consumption ion. Osmangazi University, Institute of Science and Technology, Master Thesis, Eskişehir, 28-54.
17. Modi, V.J., Hill, S.St. and Yokomimizo, T. (1995). Drag reduction of trucks through boundary-layer control. Journal of Wind Engineering and Industrial Aerodynamics 54/55, 583-594.
18. McCallen, R., Flowers, D., Owens T.D., Owens, J., Browand, F., Hammache, M.,Leonard, A., Brady, M., Salari, K.,Rutledge, W., Ross, J., Storms, B., Heineck, J. T., Driver,D., Bell, J., Walker, S.,and Zilliac, G. (2000). Aerodynamic drag of heavy vehicles class 7-8: simulation and benchmarking. SAE Technical Paper Series, 01-2209, 1-19.
19. Ogburn, M.J., and Ramroth L.A. (2007). A truck efficiency and GHD reduction opportunities in the Canadian Truck Fleet (2004-2007). Rocky Mountain Instutue Report, Canadian, Canadian, 1-13.
20. Özel, M., Aygün, E., Akansu, Y.E., Bayındırlı, C., Seyhan, M. (2015). The Passive Flow Control around a Truck-Trailer Model. International Journal of, Automotive Engineering and Technologies, Vol. 4, Issue 4, pp. 185 – 192.
21. Akansu, Y.E., Bayındırlı, C., Seyhan, M. (2016). The Improvemet Of Drag Force On A Truck Trailer Vehicle By Passive Flow Control Methods, Journal of Thermal Science and Technology, 36, 1, 133-141.