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Viscous Fan Drive Model for Robust Cooling Air Flow Simulation
Technical Paper
2007-01-0595
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
One Dimensional models for front end air flows through the cooling system package are very useful for evaluating the effects of component and front end geometry changes. To solve such models for the air flow requires a robust iterative process that involves a number of non-linear sub-models. The cooling fan (s) constitute a major part of the difficulty, especially when they employ a viscous or “thermal” fan drive. This drive varies the torque coupling between the input and output shafts based on the radiator outlet air temperature. The coupling is achieved by viscous shear between two grooved disks and is regulated by a bimetal strip valve that varies the amount of fluid between the disks. This paper presents a mathematical model by which the input/output speed ratio may be determined as a function of the air temperature and input speed. Coefficients in the model are estimated from standard supplier performance information. The model results in a simple quadratic equation which satisfies the need for robustness.
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Citation
Scott, T. and Xie, Z., "Viscous Fan Drive Model for Robust Cooling Air Flow Simulation," SAE Technical Paper 2007-01-0595, 2007, https://doi.org/10.4271/2007-01-0595.Also In
Reliability and Robust Design in Automotive Engineering, 2007
Number: SP-2119; Published: 2007-04-16
Number: SP-2119; Published: 2007-04-16
SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V116-6; Published: 2008-08-15
Number: V116-6; Published: 2008-08-15
References
- Blair, E.G. “Comparison of Modulated (Viscous) versus On-Off Fan Clutches” SAE Paper 740596 1974
- Pouder, J.M. “Air Sensing Viscous Fan Drive Performance on Charge Air Cooled Engines” SAE Paper 861944 1986
- Pisarski, J.J. “Fuel Savings and Noise Reduction with the Fan Drive” SAE Paper 801013 1980
- Bird, R.B. et. al. Dynamics of Polymeric Liquids , Vol. 1 Fluid Mechanics 2nd Wiley 1987
- Kreith, F. et.al. “Heat and Mass Transfer from a Rotating Disk” ASME Journ. Heat Transfer 1959 95 105
- Owen, J.M. et.al. “Heat Transfer from an Air Cooled Rotating Disk” Proc. Roy. Soc. Lond., Series A 336 1974 453 473
- Ong, C.L. Owen, J.M. “Computation of Flow and Heat Transfer Due to a Rotating Disk” Int. Journ. Heat and Fluid Flow 12 1991 106 115
- Shimada, R. et.al. “Enhancement of Heat Transfer from a Rotating Disk Using a Turbulence Promoter” JSME Int. Journ. 30 1987 1423 1429
- Sparrow, E.M. Kadle, D.S. “Heat Transfer from Rods or Fins Which Extend Radially Outward from a Rotating Shaft” ASME Journ Heat Transfer 106 1984 290 296
- Watel, B. et. al. “Experimental Study of Convection Heat Transfer from a Rotating Finned Tube in Transverse Air Flow” Exp. in Fluids 29 2000 79 90
- Axcell, B.P. Thianpong, C. “Convective Heat Transfer to Rotating Disks with Ribbed Surfaces” Exp. Heat Trans. 14 2001 45 58
- Churchill, S.W. “Combined Free and Forced Convection Around Immersed Bodies” Heat Exchanger Design Handbook , Hemisphere 1983
- Jackson, J.D. et.al. “Investigation of Heat Transfer from an Imposed Axial Flow of Air to a Rotating Disk” Eurotherm Seminar 46, Heat Transfer in Single Phase Flows 4
- Downs, L. “Convective Heat Transfer of Finned Rotating Disks” Mech. Eng. University of Virginia 1992
- Scott, T.C. McDonald, L. “Cooling Fan Modeling to Support Robust AC/Cooling System Simulation” SAE paper 2005-01-1905 2005