Abstract
In today’s world, the freedom to travel is a daily necessity and part of human rights. This premise is directly linked to transport sector causative of air pollution. While the focus is on heavy transport and passenger vehicles, another important segment is represented by special utility vehicles such as the ones for intervention purposes (police, ambulance, etc.). The mandatory presence of warning lights bars has a big impact in aerodynamic performance and hence, in their emissions. The paper studies the influence of a generic lights bar on sedan, hatchback and SUV body types, in three main roof mounting positions – front, median, rear. Through CFD methods it is found that the most unfavourable case is the front mounted lights bar with 6g up to 12g CO2/km (WLTP conditions). The influence of median and rear mounting position is smaller, but still adds 3g to 7g CO2/km. Using streamlines, pressure and shear forces, future work will focus on optimizing the lights bar shape and size, for a reduced SCx impact in overall performance. This topic is considered very important since main cities (including Bucharest) started taxing or banning high pollution vehicles.
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