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A Study on the Improvement of a Dirt Contamination Phenomenon in a Heavy-Duty Truck
Published May 19, 2010 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
The aerodynamic characteristics of heavy-duty trucks have become more and more important in recent vehicle designs. Hence, detailed knowledge of the flow field around vehicle is essential to improved fuel efficiency and reduced dirt contamination on the vehicle body surface. Especially, in the case of trucks driving off-road and on a wet road, dust generated by tire/soil interaction spoils not only the vehicle appearance, but also safety of the field of view because of adhesion to the body surface, side window, and exterior mirror. In this study, in the first step, full scale wind tunnel test was performed to verify the effectiveness of digital wind tunnel. In this stage, prediction results on the aerodynamic coefficients and surface pressure on the front face of trailer were compared with those of wind tunnel test. In the second step, simulation process concerning dirt contamination was also established by using digital wind tunnel with high accuracy. As a result of this study, it is confirmed that the digital wind tunnel results regarding surface pressure and drag force agrees well with those of full scale wind tunnel test. A new simulation process which enables to investigate the practical problems such as dirt contamination is developed.