This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Cooling Performance Investigation of a Rear Mounted Cooling Package for Heavy Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2011 by SAE International in United States
Annotation ability available
The aim of the study was to investigate the cooling performance of two cooling package positions for distribution vehicles by using Computational Fluid Dynamics. The first cooling package was positioned in the front of the vehicle, behind the grill and the second position was at the rear of the vehicle. Each case was evaluated by its cooling performance for a critical driving situation and its aerodynamic drag at 90 km/h, where the largest challenge of an alternative position is the cooling air availability. The geometry used was a semi-generic commercial vehicle, based on a medium size distribution truck with a heat rejection value set to a fixed typical level at maximum power for a 13 litre Euro 6 diesel engine. The heat exchangers included in the study were the air conditioning condenser, the charge air cooler and the radiator.
It was found that the main problem with the rear mounted cooling installation was the combination of the fan and the geometry after the fan. The combination of these parameters for the rear mounted cooling module resulted in a high system restriction and low cooling performance values. To obtain the same cooling performance as the front mounted installation the fan had to rotate 23 % faster, corresponding to 86 % more power for the fan, for a maximum power driving situation. For the rearward installation it was seen that the drag was reduced and no recirculation was present at low velocities as it was for the frontal positioned cooling module. Thereafter the duct after the fan for the rear mounted position was removed and the cooling performance became better than the front positioned cooling module. The conclusions made from the study were that the rearward positioned cooling module was an advantage at lower vehicle velocities, at higher speeds the air inlet has to be redesigned to obtain a more uniform airflow over the heat exchangers as well as obtaining higher cooling performance, and that the combination of the fan and its environment must be carefully matched. Though, this study was based on distribution vehicles mainly operating at lower velocities.
CitationLarsson, L., Wiklund, T., and Löfdahl, L., "Cooling Performance Investigation of a Rear Mounted Cooling Package for Heavy Vehicles," SAE Technical Paper 2011-01-0174, 2011, https://doi.org/10.4271/2011-01-0174.
- Wamei, L. Sundén, B. “A Review of Cooling System in Electric/Hybrid Vehicles,” ASEM Paper IMECE2010-37636 2010
- Lögdberg, O. “Turbulent Boundary Layer Separation and Control,” Doctoral thesis KTH Stockholm 2008
- Barnard, R.H. “Theoretical and experimental investigation of the aerodynamic drag due to automotive cooling systems,” Proc Institute of Mechanical Engineers 214 ImechE 2000
- Santer, R.M. Gleason, M.E. “The Aerodynamic Development of the Probe IV Advanced Concept Vehicle,” SAE Paper 831000 1984
- Williams, J. “Aerodynamic Drag of Engine-Cooling Airflow with External Interference,” SAE Technical Paper 2003-01-0996 2003 10.4271/2003-01-0996
- Kuthada, T. Wiedemann, J. “Investigations in a Cooling Air Flow System under the Influence of Road Simulation,” SAE Technical Paper 2008-01-0796 2008 10.4271/2008-01-0796
- Volvo 3P “Volvo Group Global,” http://www.volvogroup.com Jan. 2011
- Khondge, A.D. Sovani, S.D. Lokhande, B.S. Jain, S.K. et al. “Simulations of the Flow-Field Around a Generic Tractor-Trailer Truck,” SAE Technical Paper 2004-01-1147 2004 10.4271/2004-01-1147
- Gullberg, P. Löfdahl, L. Adelman, S. Nilsson, P. “An Investigation and Correction Method of Stationary Fan CFD MRF Simulations,” SAE Technical Paper 2009-01-3067 2009 10.4271/2009-01-3067
- CD Adapco StarCCM+ Manual , 4.06.011 edition
- Gullberg, P. “Optimization of the Flow Process in Engine Bays - 3D Fan Modeling Strategies,” Licentiate thesis Chalmers University of Technology Gothenburg 2009
- Siqueira, C.R. Motta, M. “Numerical Simulation of a Bus Underhood Flow,” SAE Technical Paper 2003-01-3522 2003 10.4271/2003-01--3522
- Othmer, C. “CFD Topology and Shape with Adjoint Methods,” VDI Fahrzeung- and Verkehrstechnik 13. Internationaler Kongress 2006
- White, F.M. “Fluid Mechanics, 5 th Edition” McGraw-Hill New York 007-124343-7 314 2005