Abstract
A numerical simulation is carried out to analyze the flow field of cooling air through the radiator and engine compartment. In order to consider the strong effect of the suction-type flow by the cooling fan at engine idling condition, a potential flow analysis is attempted by the assumption of a line sink located at the position of the cooling fan. The governing equations for steady two-dimensional, incompressible, turbulent flow are solved with the two-equationk-ε model for turbulence. The velocity profiles in the underhood engine compartment and around the front-end of a real vehicle are measured to compare with the numerical results. The agreement between the numerical and experimental results is fairly good. It is concluded that a two-dimensional computation is a fast and efficient tool for predicting the effect of front-end design on the cooling air flow through the radiator.
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Abbreviations
- D fan :
-
Depth of the volume swept by the cooling fan
- D ha :
-
Hydraulic diameter of the cooling air passage
- f :
-
Friction factor
- F :
-
Function of complex variables
- h, h′ :
-
Geometrical parameters (Fig. 1)
- ΔP o :
-
Pressure change through the fan
- Q :
-
Volume flow-rate for line sink
- S :
-
Momentum source term
- u fan :
-
Air velocity at fan location inx direction
- u rad :
-
Cooling air velocity through the radiator
- u, v :
-
Velocity component inx andy direction, respectively
- W :
-
Complex velocity
- αp :
-
Gradient of pressure change through the fan
- ρ:
-
Density of air
- μeff :
-
Effective viscosity
- Φ:
-
Velocity potential
- ζ:
-
Complex variable
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Jurng, J., Hur, N., Kim, K.H. et al. Flow analysis of engine cooling system for a passenger vehicle. KSME Journal 7, 312–319 (1993). https://doi.org/10.1007/BF02953202
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DOI: https://doi.org/10.1007/BF02953202