Extensive knowledge exists in the testing of 1/8th scale, Class 8 tractor trailer models within fixed floor wind tunnels. This size of model has proven to correlate well with in a Reynolds number ranging between 1M and 6M. Prior testing is well documented on a Generic Conventional Model (GCM) in the NASA AMES 7x10ft and 12ft wind tunnels. Within this prior research into Heavy Vehicle Aerodynamics, it has been identified on numerous occasions that improved accuracy will allow for greater understanding of the flow field structure in the underbody and internal flow regions. The aim of this paper is to summarize the new research conducted at the Auto Research Center (ARC), a 50% rolling road scale wind tunnel facility in Indianapolis, Indiana. ARC has tested a rolling road 1/8th scale tractor trailer at 50m/s constant dynamic (approximately 1M Re). The model features fully articulated suspension and axle systems, engine bay detail for internal flow simulation, realistic radiator blockage, and an automated model motion system capable of controlling the model in roll, heave, pitch and yaw. To remain consistent with the previous testing conducted by NASA AMES, a replica of the GCM tractor and trailer shapes were used for the upper aerodynamic surfaces. The test objectives initially included a demonstration of correlation between the ARC and NASA wind tunnels with the rolling road switched off. This baseline is then compared to data obtained with the rolling road on, allowing the impact of 18 rotating wheels and tires on the flow structure to be visualized and analyzed. Further studies are presented on the effects of improved detail in the underbody regions, and on the effects of internal and cooling flows as applied to the GCM model. Future work at ARC will use detailed cab bodywork for analysis of specific OEM tractors and trailers.


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