Active drag reduction of a simplified car model using a combination of steady actuations

B. F. Zhang, Y. Zhou, Suet To

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


Active drag reduction of an Ahmed model with a slant angle of 25° is experimentally investigated based on a combination of steady blowing over the rear window and behind the vertical base. The Reynolds number Re examined is 0.9 × 105- 2.7 × 105. Steady blowing S1was applied along the upper edge of the rear window, which has been demonstrated to be effective in suppressing the recirculation bubble on the slanted surface. This actuation led to a drag reduction up to 12%. Steady blowing S2was deployed along two side edges of the rear window to break the well-known longitudinal C-pillar vortices, reducing drag by around 6%. Steady blowing S3and S4were applied along the upper and lower edges of the base to control the upper and lower recirculation bubbles behind the base to raise the base pressure, producing a drag reduction up to 12% and 15%, respectively. The combination of the four actuations achieved an impressive drag reduction of 25%, greatly higher than any previous drag reduction reported and in fact very close to the target set by automotive industries.
Original languageEnglish
Title of host publicationProceedings of the 19th Australasian Fluid Mechanics Conference, AFMC 2014
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9780646596952
Publication statusPublished - 1 Jan 2014
Event19th Australasian Fluid Mechanics Conference, AFMC 2014 - Melbourne, Australia
Duration: 8 Dec 201411 Dec 2014


Conference19th Australasian Fluid Mechanics Conference, AFMC 2014

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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