This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Utilizing CFD Approach for Preeminent Assessment of Defroster Air Flow Distribution and Predicting Windscreen Deicing Behavior
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
Annotation ability available
Adequate visibility through the automobile windscreen is a critical aspect of driving, most often at very low temperatures when ice tends to be formed on the windscreen. The geometry of the existing defroster system needs to be improved in the vehicles, with the main aim of substantial increase in air mass flow reaching the windscreen through defroster nozzles and appropriate velocity distribution over the windscreen, while respecting all packaging constraints. The reason of this study is to investigate the windscreen deicing behavior of a vehicle by means of Computational Fluid Dynamics (CFD) with the main concern of improving deicing process by design an appropriate defroster. Two different defrosters with completely different geometry are considered for this purpose. A detailed full interior model of an existing vehicle is created via CAE tools. A transient simulation is performed and results are extracted to show how a proper design of the defroster will lead to considerable improve in deicing process. It is found that the airflow produced by the second defroster is highly non-uniform and does not cover the whole windscreen area. The heating temperature pattern on the windscreen and defrosted region is affected by this non-uniformity. Thus the air flow distribution of the defroster duct is improved by variety of modification proposals so that the overall time of deicing process decreases.
|Journal Article||Development of SLD Capabilities in the RTA Icing Wind Tunnel|
|Technical Paper||Simulation of Ice Accretion on Airfoils during Flight|
|Technical Paper||Two-Way Flow Coupling in Ice Crystal Icing Simulation|
CitationJahani, K. and Beigmoradi, S., "Utilizing CFD Approach for Preeminent Assessment of Defroster Air Flow Distribution and Predicting Windscreen Deicing Behavior," SAE Technical Paper 2014-01-0688, 2014, https://doi.org/10.4271/2014-01-0688.
- Aroussi, A., Hassan, A., Morsi, Y.S., “Numerical Simulation of the Airflow Over and Heat Transfer through a Vehicle Windshield Defrosting and Demisting System,” Heat and Mass Transfer J., 39: 401-405, 2003.
- Park, W. G., Park, M. S. and Jang, K. L., Flow and Temperature Analysis Within Automobile Cabin by Discharged Hot Air From Defrost Nozzle,” Int. J. Automotive Technology 7(2): 139-143, 2006.
- Kader, M. F., Youn, Y. M., Jun Y. D., Lee, K. B., “Characterization of the HVAC Performance with Defroster Grillers and Instrument Panel Registers,” Int. J. of Automotive Technology 10(3): 305-312, 2009.
- Roy S., Nasr K., Patel P. and AbdoulNour B., “An Experimental and Numerical Study of Heat Transfer off an Inclined Plane Surface Subject to an Impingement Airflow,” Intl. J. of Heat and Mass Transfer 45: 1615-1629, 2002.
- Roy S. and Patel P., “Study of Heat Transfer for a Pair of Rectangular Jets Impinging on an Inclined Surface,” Int. J. Heat and Mass Transfer 46: 411-425, 2003.
- Voller V.R., Prakash C., “A Fixed Grid Numerical Modeling Methodology for Convection-Diffusion Mushy Region Phase-Change Problems,” Int. J. Heat and Mass Transfer 30: 1709-1719, 1987.
- On the Approximation of the Laws of the Member States Relating to the Defrosting and Demisting System of Glazed Surfaces of Motor Vehicle, 78/317/EEC, 21 Dec. 1977.
- Turbulent Flows: Models and Physics, Jean Piquet, revised 2nd printing, Springer, 2001.