Effect of steady airflow field on drag and downforce

The purpose of this study is to examine the effect of the steady airflow field of a rear spoiler on the coefficients of drag (C<sub>D) and downforce C<sub>DF. The type of spoiler is suggested as a two-jointed arm model that mimics the flapping flight mechanism of the Canada goose. Computational fluid dynamics (CFD) technique was used for the steady airflow analysis of a vehicle implemented with various spoiler topologies. The authors evaluated C<sub>D and C<sub>DF due to the three types of airfoils and the five phases of each airfoil. The authors obtained the following conclusions from the results: (1) The authors found that the best cases for C<sub>D and C<sub>DF were the case of Phase 5 and symmetry airfoil, and the case of Phase 1 and reverse airfoil, respectively. (2) It is clear that C<sub>D becomes the largest at Phase 1 of the reverse airfoil, since the eddy magnitude at the rear of the vehicle is the largest, and C<sub>DF also becomes the largest during that phase, since the pressure distribution on the upper surface of the spoiler is very large. (3) As Phase 1 moves to Phase 5 in the same type of airfoil, it is advantageous for CD and disadvantageous for C<sub>DF, respectively.

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  • English

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  • Accession Number: 01597481
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 11 2016 10:23AM