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A Correction Method for Stationary Fan CFD MRF Models
Technical Paper
2009-01-0178
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A common fan model to use in automotive under hood simulations is the Multiple Reference Frame (MRF) model and within the industry, for this specific application, this model is well known to under predict performance.
In this paper we have examined the possibilities of correcting this deficiency with a simple “speed correction”. This is done by testing and simulating a production fan in the Volvo Fan Test Rig for two operating speeds, 1200 rpm and 2400 rpm. Pressure rise, fan power and static efficiency are presented as functions of volumetric flow rate. The simulations verify that using the MRF model the common behavior of under predicting pressure rise and performance of the fan occur. In addition, this work shows that; although the MRF is not predicting fan performance correctly it constitutes a reliable fan modeling strategy. In fact, the classical fan laws apply to the MRF model, and this justifies the suggested procedure of simply “speed correcting” the fan and by doing so a consistent behavior is received. For a standard 750 mm production fan, it is shown that by increasing the fan speed with 14%, throughout the range of operating speeds, one accurately models the pressure rise over mass flow for most of vehicle operating conditions.
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Citation
Gullberg, P., Löfdahl, L., Adelman, S., and Nilsson, P., "A Correction Method for Stationary Fan CFD MRF Models," SAE Technical Paper 2009-01-0178, 2009, https://doi.org/10.4271/2009-01-0178.Also In
References
- Moreau S. et.al “Numerical and Experimental Investigation of Rotor-Stator Interaction in Automotive Engine Cooling Fan Systems” 7th European Conference on Turbomachinery 2007
- Gullberg P. et.al “3D Fan Modelling Strategies for Heavy Duty Vehicle Cooling Installations –CFD with Experimental Validation” FISITA World Automotive Congress 2008