Abstract
The interaction of underhood flow with external aerodynamics is part of the main topics for the development of automotive aerodynamics. In particular, the location and design of cooling air exits as well as the mass flow through the radiator package are considered to be important factors. The DrivAer is an open-source, aerodynamic reference model, which has a realistic overall geometry compared to rather simple, generic shapes such as the SAE body. The model is flexible in use as it provides different rear end and wheel designs. The open-grille upgrade of the DrivAer enhances the potential of the body towards a reference model for more detailed, open cooling investigations.
In the present study, the 40% scale Mock-Up DrivAer model of the Technical University of Munich was upgraded with underhood flow for wind tunnel tests with moving ground simulation. The wind tunnel measurements covered different underhood flow configurations including variations for the pressure drop of the radiator package and different locations for cooling air exits – both for different rear end shapes of the model. Additionally, the effect of underhood flow on the aerodynamics of both the notchback and the estateback rear end were calculated for six different radiator packages using DDES simulations with OpenFOAM®.
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Abbreviations
- DDES:
-
Delayed Detached-Eddy Simulation
- DES:
-
Detached-Eddy Simulation
- LES:
-
Large Eddy Simulation
- RANS:
-
Reynolds Averaged Navier-Stokes Equations
- SA:
-
Spalart-Allmaras turbulence model
- TUM:
-
Technical University of Munich
- WTA:
-
Wind Tunnel A (Large Wind Tunnel TUM)
- \( A_{c} \) :
-
Closed area of the perforated sheets
- \( A_{o} \) :
-
Open/exposed area of the perforated sheets
- \( A_{o} /A_{c} \) :
-
Openness ratio of the perforated sheets
- \( C_{D} \) :
-
Drag coefficient
- \( C_{L,f} \) :
-
Front lift coefficient
- \( C_{L,r} \) :
-
Rear lift coefficient
- \( \Delta C_{D,c} \) :
-
Effect of underhood flow on drag coefficient \( C_{D} \)
- \( \Delta C_{L,f,c} \) :
-
Effect of underhood flow on front lift coefficient \( C_{L,f} \)
- \( \Delta C_{{L,{\text{r}},c}} \) :
-
Effect of underhood flow on rear lift coefficient \( C_{L,r} \)
References
Technical University of Munich, DrivAer Model. http://www.drivaer.com. Accessed 9 July 2017
Heft, A.I., Indinger, T., Adams, N.A.: Introduction of a New Realistic Generic Car Model for Aerodynamic Investigations, SAE Technical Paper 2012-01-0168 (2012)
Mack, S., Indinger, T., Adams, N.A., Unterlechner, P.: The Ground Simulation Upgrade of the Large Wind Tunnel at the Technische Universität München, SAE Technical Paper 2012-01-0299 (2012)
Mack, S., Indinger, T., Adams, N.A., Blume, S., Unterlechner, P.: The interior design of a 40% scaled DrivAer body and first experimental results. In: Proceedings of the ASME 2012 Fluids Engineering Summer Meeting (2012)
Heft, A.: Aerodynamic Investigation of the Cooling Requirements of Electric Vehicles (Ph.D. thesis). Dr. Hut Verlag, München (2014)
Heft, A., Indinger, T., Adams, N.A.: Experimental and numerical investigation of the DrivAer model. In: Proceedings of the ASME 2012 Fluids Engineering Summer Meeting FEDSM2012-72272 (2012)
Heft, A.I., Indinger, T., Adams, N.A.: Systematic optimization of the cooling duct system of electric vehicles. In: 31st AIAA Applied Aerodynamics Conference, Fluid Dynamics and Co-located Conferences (AIAA 2013-2520) (2013)
Miao, L., Mack, S., Indinger, T.: Experimental and numerical investigation of automotive aerodynamics using DrivAer model. In: ASME. International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, vol. 3 (2015). 17th International Conference on Advanced Vehicle Technologies; 12th International Conference on Design Education
Collin, C., Mack, S., Indinger, T., Müller, J.: A numerical and experimental evaluation of open jet wind tunnel. SAE Int. J. Passeng. Cars Mech. Syst. 9(2), 657–679 (2016)
Wittmeier, F., Kuthada, T.: Open grille DrivAer model - first results. SAE Int. J. Passeng. Cars Mech. Syst. 8(1), 252–260 (2015)
Kuthada, T., Wittmeier, F., Bock, B., Schoenleber, C.: The effects of cooling air on the flow field around a vehicle. SAE Int. J. Passeng. Cars Mech. Syst. 9(2), 723–732 (2016)
Matsumoto, D., Haag, L., Indinger, T.: Investigation of the unsteady external and underhood air flow of the DrivAer model by dynamic mode decomposition methods. In: Proceedings of the JSAE Annual Spring Congress, 25–27 May 2016
Simmonds, N., Pitmann, J., Tsoutsanis, P., Jenkins, K., Gaylard, A., Jansen, W.: Complete Body Aerodynamic Study of three Vehicles, SAE Technical Paper 2017-01-1529 (2017)
Haag, L., Kiewat, M., Indinger, T., Blacha, T.: Numerical and experimental investigations of rotating wheel aerodynamics on the DrivAer model with engine bay flow. In: Proceedings of the ASME 2017 Fluids Engineering Division Summer Meeting FEDSM2017-69305 (2017)
Spalart, P.R., Allmaras, S.R.: A One-Equation Turbulence Model for Aerodynamic Flows, AIAA Paper 92-0439 (1992)
Spalart, P.R., Jou, W.H., Strelets, M., Allmaras, S.R.: Comments on the feasibility of LES for wings and on a hybrid RANS/LES approach. In: Advances in DNS/LES, pp. 137–147 (1997)
Spalart, P.R., Deck, S., Shur, M.L., Squires, K.D., Strelets, M.K., Travin, A.K.: A new version of detached-eddy simulation, resistant to ambiguous grid densities. Theor. Comput. Fluid Dyn. 20, 181–195 (2006)
Spalart, P.R.: Detached-eddy simulation. Ann. Rev. Fluid Mech. 41, 181–202 (2009)
Islam, M., Decker, F., de Villiers, E., Jackson, A., Gines, J., Grahs, T., Gitt-Gehrke, A., Comas i Font, J.: Application of Detached-Eddy Simulation for Automotive Aerodynamics Development, SAE Technical Paper 2009-01-0333 (2009)
Shih, T.H., Povinelli, L.A., Liu, N.S., Che, K.H.: A generalized wall function for complex turbulent flows. In: Proceedings of the 8th Aerospace Science Meeting and Exhibit sponsored by the AIAA (2000)
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Collin, C., Müller, J., Islam, M., Indinger, T. (2018). On the Influence of Underhood Flow on External Aerodynamics of the DrivAer Model. In: Wiedemann, J. (eds) Progress in Vehicle Aerodynamics and Thermal Management. FKFS 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-67822-1_14
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DOI: https://doi.org/10.1007/978-3-319-67822-1_14
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