Study of Influence of MRF Method on the Prediction of the Engine Cooling Fan Performance

2011 ◽  
Author(s):  
Yuji Kobayashi ◽  
Itsuhei Kohri ◽  
Yukio Matsushima
Keyword(s):  
Fan Performance ◽  
Engine Cooling ◽  
Cooling Fan

Determination of Suitable MRF-Region for Practical Prediction of Engine Cooling Fan Performance

2011 ◽  
Author(s):  
Yuji Kobayashi ◽  
Itsuhei Kohri ◽  
Yukio Matsushima
Keyword(s):  
Predictive Accuracy ◽  
Boundary Surface ◽  
Cooling Systems ◽  
Automotive Engine ◽  
Fan Performance ◽  
Multiple Parameters ◽  
Engine Cooling ◽  
Cooling Fan ◽  
Practical Accuracy

Recently, CFD technology has become popular to the prediction of the engine cooling performance for the design of the automotive engine cooling systems. Particularly, the practical prediction of the cooling fan performance is one of the important issues. In the design phase of the vehicle development, combinations of multiple parameters are generally examined. Certainly, the unsteady calculations such as LES or LBM, which require high resolution of the space, give good accuracy meanwhile they spend much time for their executions so that they are not always practical. Therefore, the steady RANS coupling with MRF method is indispensable. However, it has been pointed out that, in case of complicated layout around the fan of an actual vehicle, the size of the MRF-region dominates predictive accuracy while the symmetry of the flow structure is taken account. Then, in this study, attracting on the discontinuity at the boundary surface of the MRF-region, authors found the method to determine adequate MRF-region to predict the fan performance in practical accuracy. This paper deals with the outline of the method and their applications.

Application of acoustic analogy to automotive engine-cooling fan noise prediction

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 1095-1098 ◽  
Author(s):  
Jeonghan Lee ◽  
Kyungseok Cho ◽  
Soogab Lee
Keyword(s):  
Noise Prediction ◽  
Acoustic Analogy ◽  
Fan Noise ◽  
Automotive Engine ◽  
Engine Cooling ◽  
Cooling Fan

A Rational Approach to the Aerodynamics of Engine Cooling System Design

1968 ◽  
Vol 183 (1) ◽  
pp. 69-84 ◽  
Author(s):  
M. G. Paish
Keyword(s):  
Motor Vehicle ◽  
Cooling System ◽  
Original System ◽  
Production Costs ◽  
Rational Approach ◽  
Test Vehicle ◽  
Secondary Importance ◽  
Cooling Systems ◽  
Engine Cooling ◽  
Cooling Fan

The aerodynamic inefficiencies of motor vehicle cooling systems are generally of secondary importance to their production costs. However, the advent of the inexpensive moulded fan has meant that an improvement in cooling system aerodynamics can be more readily achieved which could reduce costs and radiator sizes, with the additional benefits of predictable performance and improved economy. In the investigation described, the design objective was to meet the top gear cooling targets entirely with ram-induced airflow, and to design the engine driven fan so that it consumed negligible power for top gear conditions, whilst being capable of meeting the cooling targets in the intermediate gear ratios. The work divided itself into the following three sections: (1) The prediction and achievement of the maximum ram-induced airflows. (2) Designing the cooling fan to be effectively free-wheeling and, therefore, consuming negligible power during top gear motoring, and to measure the performance of the resulting fan throughout the ram and fan assisted airflow regimes. (3) Designing and predicting the performance of a cooling system which was subsequently built and installed in a test vehicle in order to check its performance and making an overall comparison with regard to the original system. The paper shows that the design objectives were closely achieved. The 1·7 litre test vehicle was cooled satisfactorily with a one foot square radiator with the expenditure of only 0·9 hp in the cooling system when travelling at 70 mile/h.

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