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Open AccessArticle

CFD Simulation of Defogging Effectivity in Automotive Headlamp

Brno University of Technology, Faculty of Mechanical Engineering, 61669 Brno, Czech Republic
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Energies 2019, 12(13), 2609; https://doi.org/10.3390/en12132609
Received: 30 May 2019 / Revised: 24 June 2019 / Accepted: 3 July 2019 / Published: 7 July 2019
(This article belongs to the Special Issue Computational Fluid Dynamics (CFD) 2018)
In the past decade, the condensation of internal air humidity in automotive headlamps has become more prevalent than ever due to the increased usage of a new light source—LEDs. LEDs emit far less heat than previously-used halogen lamps, which makes them far more susceptible to fogging. This fogging occurs when the internal parts of the headlamp fall to a temperature below the dew point. The front glass is most vulnerable to condensation due to its direct exposure to ambient conditions. Headlamp fogging leads to a decrease in performance and the possibility of malfunctions, which has an impact not only on the functional aspect of the product’s use but also on traffic safety. There are currently several technical solutions available which can determine the effectivity of ventilation systems applied for headlamp defogging. Another approach to this problem may be to use a numerical simulation. This paper proposes a CFD (computational fluid dynamics) simulation with a slightly simplified 3D model of an actual headlamp, which allows simulation of all the phenomena closely connected with fluid flow and phase change. The results were validated by real experiments on a special fogging–defogging test rig. This paper compares three different simulations and their compliance with real experiments. View Full-Text
Keywords: headlamp; fogging; defogging; CFD; condensation; dew point headlamp; fogging; defogging; CFD; condensation; dew point
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Guzej, M.; Zachar, M. CFD Simulation of Defogging Effectivity in Automotive Headlamp. Energies 2019, 12, 2609.

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