Abstract
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 language | English |
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Title of host publication | Proceedings of the 19th Australasian Fluid Mechanics Conference, AFMC 2014 |
Publisher | Australasian Fluid Mechanics Society |
ISBN (Electronic) | 9780646596952 |
Publication status | Published - 1 Jan 2014 |
Event | 19th Australasian Fluid Mechanics Conference, AFMC 2014 - Melbourne, Australia Duration: 8 Dec 2014 → 11 Dec 2014 |
Conference
Conference | 19th Australasian Fluid Mechanics Conference, AFMC 2014 |
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Country/Territory | Australia |
City | Melbourne |
Period | 8/12/14 → 11/12/14 |
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes