Numerical Analysis of Flow in the Gap between a Simplified Tractor-Trailer Model and Cross Vortex Trap Device
Heavy trucks are aerodynamically inefficient due to their un-streamlined body shapes, leading to more than of 60% engine power being required to overcome the aerodynamics drag at 60 m/hr. There are many aerodynamics drag reduction devices developed and this paper presents a study on a drag reduction device called Cross Vortex Trap Device (CVTD) deployed in the gap between the tractor and the trailer of a simplified tractor-trailer model. Numerical simulations have been carried out at Reynolds number 0.51×106 based on inlet flow velocity and height of the trailer using the Reynolds-Averaged Navier-Stokes (RANS) approach. Three different configurations of CVTD have been studied, ranging from single to three slabs, equally spaced on the front face of the trailer. Flow field around three different configurations of trap device have been analysed and presented. The results show that a maximum of 12.25% drag reduction can be achieved when a triple vortex trap device is used. Detailed flow field analysis along with pressure contours are presented to elucidate the drag reduction mechanisms of CVTD and why the triple vortex trap configuration produces the maximum drag reduction among the three configurations tested.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3593100Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 170
 K.R. Cooper, “National Research Council of Canada,” Springer Link, vol. 19 pp.9-28, 2004.
 D. L. W. K. C. Ilhan Bayraktar, "An Assessment of drag reduction devices for heavy trucks using design of experiments and computaitonal fluid dynamics," in SAE, 2005.
 M. M. F. B. Mustapha Hammache, "Aerodynamic forces on truck model, including two trucks in tandem," California Path Program, pp. 1-25, 2001.
 L. L. H. A. Thomas Curry, "Reducing aerodynamic drag and rolling resistance from heavy duty trucks: Summary of available technologies and applicability to chinese trucks.," MJ Bradley and Associates LLC, California, 2012.
 Y. Z. T. Charles, "Impact of gap size between two bluff bodies on the flow”, in ASTFE, Portoroz, 2017.
 R. M. Wood, "Road transport technology," (Online). Available: http://road-transport-technology.org/Proceedings/9%20-%20ISHVWD/Session%209/A%20Discussion%20of%20a%20Heavy%20Truck%20Advanced%20Aerodynamic%20Trailer%20System%20-%20Wood.pdf. (Accessed 26 04 2019).
 N. C. Pradeep Kumar, "Enhancement of Aerodynamic efficiency of truck-trailer," International Journal of Innovative Research in Science, Engineering and Technology, vol. 5, no. 6, pp. 9563 - 9573, 2016.
 M. B. F. Hammache, "On the aerodynamics of tractor-trailers. In: The Aerodynamics of Heavy Vehicles: Trucks, Busses and Trains," Springer, Monterey, 2002.
 J. Allan, "Aerodynamic drag and pressure measurements on a simplified tractor-trailer model," Journal of Wind Engineering and Industrial Aerodynamics, vol. 9, pp. 125-136, 1981.
 S. K. Jan Osth, "The flow around a simplified tractor-trailer model studied by large eddy simulation," Journal of Wind Engineering and Ind Aerodynamics, vol. 102, pp. 36-47, 2012.