Side Force Coefficient Evaluation of a Commercial Bus with Vortex Generators

Ribeiro, Daniel Garcia; Mezarina, Juan Flores; Bravo-Mosquera, Pedro David; Cerón-Muñoz, Hernán Darío; Vaca-Rios, John Jairo

doi:10.26678/abcm.cobem2019.cob2019-1346

Cited by 1 publication

(3 citation statements)

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Section: Methodsmentioning

confidence: 80%

“…The maximum wind speed is 25 m/s with a maximum intensity of turbulence of about 0.15%. Other studies performed at this wind tunnel can be found in Ribeiro et al, 25 Bravo-Mosquera et al, 34 Mezarina et al, 35 Florez et al, 36 and Bravo-Mosquera et al 37 Local temperature and atmospheric pressure were acquired with an ITWH-170 INSTRUTEMP weather station. The drag force was measured with a TE-81 aerodynamic balance (uncertainty of 60.02N), while the dynamic pressure was measured with a Pitot tube connected to a digital micro manometer DP-CALC TSI (uncertainty of 60.1 Pa).…”

Section: Methodsmentioning

confidence: 99%

“…However, the vortices generated at the end of the bus were removed by the use of spoilers, resulting in a drag reduction and a significant enhancement of stability. Previously, Ribeiro et al 25 reported the assessment of the side force coefficient on the present bus using vortex generators. The results showed that vortex generators reduce the side force coefficient at no yawed conditions, however, for yawed conditions, an increase of the side force coefficient was obtained.…”

Section: Introductionmentioning

confidence: 99%

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Drag reduction of a commercial bus with add-on aerodynamic devices

Ribeiro

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Ayala-Zuluaga

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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In the automotive industry, the implementation of drag reduction systems has provided considerable decreases in fuel consumption. These outcomes are in line with the increasing demands of the environmental regulations and consumers’ requirements. Although some studies explain how aerodynamic devices reduce the aerodynamic drag on light and heavy vehicles such as Ahmed bodies and trucks, buses have received almost no attention. For this reason, the flow over the Marcopolo Paradiso 1200 G7 commercial bus and the influence of several aerodynamic devices on the drag force and fuel consumption of the bus are discussed in this article. Three distinct devices (vortex generators, lateral devices, and rails) were proposed after flow visualization tests on the baseline bus. Thus, the entire evaluation consisted of 11 arrangements by combining the three aerodynamic devices. The changes in drag due to all arrangements are estimated using wind tunnel tests, which are validated using Computational Fluid Dynamics simulations. The fuel consumption is evaluated in a simplified long-haul driving cycle between two cities. The devices were able to alter the flow behavior on the bus, resulting in a maximum decrease of 8.63% in the drag coefficient and 3.92% in fuel consumption. Given that the devices used are just first prototypes, we estimate that greater reductions can be achieved with optimized systems. Likewise, this paper probably leads to real applications in other commercial buses due to the evident drag reductions.

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