Experimental study on Ahmed’s body drag coefficient
Dominik Wysocki
University of Technology, 42-201 Częstochowa, PolandArkadiusz Szymanek
University of Technology, 42-201 Częstochowa, PolandAbstract
The work presents an experimental designation of the aerodynamic drag coefficient for two configurations of the Ahmed body model, with slant angle of 25o and with the inactive synthetic jet generator. When analyzing the aerodynamic drag of vehicles, most authors focus on higher Reynolds numbers, describing lower values only by designated trend lines. Which is why the main contribution of this experimental work was to designate the Ahmed’s body drag coefficient for low Reynolds numbers and to verify the obtained results with other authors experiments especially with the trend lines for Reynolds number in the range 0,35x105 – 1,8x105. For data taken from the literature, it can be seen that the value of the drag coefficient for the Ahmed body model decreases when the Reynolds number increases. The results obtained during the experiment show the opposite tendency.
Keywords:
Ahmed body, aerodynamics, wind tunnel, drag coefficient, boundary layerReferences
Ahmed, S. R., G. Ramm, and G. Faltin. 1984. Some salient features of the time-averaged ground vehicle wake. SAE Transactions, 93:473–503.
Crossref
Google Scholar
Bello F. 2011. Numerical study of Ahmed body. Universidad de Malaga. Google Scholar
Bello-Millán F. J., Mäkelä T., Parras L., del Pino C., Ferrera C. 2016. Experimental study on Ahmed's body drag coefficient for different yaw angles. Journal of Wind Engineering and Industrial Aerodynamics, 157:140-144. doi: 10.1016/j.jweia.2016.08.005
Crossref
Google Scholar
Cui W., Zhu H., Xia C., Yang Z. 2015. Comparison of Steady Blowing and Synthetic Jets for Aerodynamic Drag Reduction of a Simplified Vehicle. Procedia Engineering, 126:388-392. doi: 10.1016/j.proeng.2015.11.224
Crossref
Google Scholar
Kadivar M., Tormey D., McGranaghan G. 2021. A review on turbulent flow over rough surfaces: Fundamentals and theories. International Journal of Thermofluids, 10:100077. doi: 10.1016/j.ijft.2021.100077
Crossref
Google Scholar
Maho H. 2016. Concepts for generating lateral aerodynamic forces by means of an asymmetric airflow. AIRSHAPER Department of Computational Fluid Dynamics. Google Scholar
Mäkelä T. 2013. Experimental study of the flow around the Ahmed body. Universidad de Malaga. Google Scholar
Meile W., Brenn G., Reppenhagen A., Lechner B., Fuchs A. 2011. Experiments and numerical simulations on the aerodynamics of the Ahmed body. CFD Letters, 3(1). Google Scholar
Piechna J. 2000. Fundamentals of vehicle aerodynamics. Wydawnictwo Komunikacji i Łączności. Warsaw (in Polish). Google Scholar
Schlichting H., Gersten K. 2000. Boundary-Layer Theory. Springer, 8th edition:29-50. doi: 10.1007/978-3-642-85829-1
Crossref
Google Scholar
Shadmani S., Mousavi Nainiyan S. M., Ghasemiasl R. 2018. Experimental study of flow control over an Ahmed body using plasma actuator. Mechanics and Mechanical Engineering, 22(1):239-251.
Crossref
Google Scholar
Sivaraj G., Parammasivam K. M., Suganya G. 2018. Reduction of aerodynamic drag force for Reducing fuel consumption in road vehicle using basebleed. Journal of Applied Fluid Mechanics, 11(6):1489-1495. doi: 10.29252/jafm.11.06.29115
Crossref
Google Scholar
Sturm H., Dumstorff G., Busche P., Westermann D., Lang W. 2012. Boundary Layer Separation and Reattachment Detection on Airfoils by Thermal Flow Sensors. Sensors, 12(11):14292-14306. doi: 10.3390/s121114292
Crossref
Google Scholar
Talay T. A. 1975. Introduction to the aerodynamics of flight. NASA History Division, Washington, D. C. Google Scholar
Thacker A., Aubrun S., Leroy A., Devinant P. 2012. Effects of suppressing the 3D separation on the rear slant on the flow structures around an Ahmed body. Journal of Wind Engineering and Industrial Aerodynamics, 107-108:237-243. doi: 10.1016/j.jweia.2012.04.022
Crossref
Google Scholar
Wysocki D. 2020. Experimental studies to reduce the aerodynamic drag of a vehicle model using “synthetic jet”. Mateusz Weiland Network Solutions, Poszerzamy horyzonty, 21(3):83-99 (in Polish). Google Scholar
Wang B., Yang Z., Zhu H. 2019. Active flow control on the 25° Ahmed body using a new unsteady jet. International Journal of Heat and Fluid Flow, 79:108459. doi: 10.1016/j.ijheatfluidflow.2019.108459
Crossref
Google Scholar
Zhu L. D., Li L., Xu Y. L., Zhu Q. 2012. Wind tunnel investigations of aerodynamic coefficients of road vehicles on bridge deck. Journal of Fluids and Structures, 30:35-50. doi: 10.1016/j.jfluidstructs.2011.09.002
Crossref
Google Scholar
University of Technology, 42-201 Częstochowa, Poland
University of Technology, 42-201 Częstochowa, Poland
