2011
DOI: 10.1007/s00348-011-1245-5
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Abstract: This paper highlights steady and unsteady measurements and flow control results obtained on an Ahmed model with slant angle of 25°in wind tunnel. On this high-drag configuration characterized by a large separation bubble along with energetic streamwise vortices, time-averaged and time-dependent results without control are first presented. The influence of rear-end periodic forcing on the drag coefficient is then investigated using electrically operated magnetic valves in an open-loop control scheme. Four disti… Show more

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Cited by 99 publications
(51 citation statements)
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“…For each experiment a different rear section of the model was made into which the angled inserts were located. All the tapers were 45mm in length, giving an aspect ratio of 8 The MIRA co-ordinate system is used throughout this work. The origin of the system is located on the tunnel floor at mid-wheelbase, mid-track.…”
Section: The Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…For each experiment a different rear section of the model was made into which the angled inserts were located. All the tapers were 45mm in length, giving an aspect ratio of 8 The MIRA co-ordinate system is used throughout this work. The origin of the system is located on the tunnel floor at mid-wheelbase, mid-track.…”
Section: The Modelmentioning
confidence: 99%
“…This can be achieved through passive optimization, for example geometry changes, vortex generators, flaps, and surface roughness, or using active control, for example, suction, blowing, oscillated suction and blowing, moveable vortex generators or flaps [2][3][4][5][6][7][8][9][10][11]. Active flow control is an attractive option because of the potential freedom it allows for vehicle styling as all that is required externally is the jet orifices.…”
Section: Introductionmentioning
confidence: 99%
“…The issues are important from both fundamental and applicative points of view. Firstly, the reported St values of unsteady flow structures around the Ahmed body of ϕ = 25 • are greatly scattered; the measured or calculated St varies between 0.18 and 0.50 over the rear window (Minguez et al 2008;Thacker et al 2010;Boucinha et al 2011;Heft, Indinger & Adams 2011;Joseph et al 2012) and between 0.36 and 0.53 behind the base (Minguez et al 2008;Boucinha et al 2011;Joseph et al 2012). A summary of St reported in the literature is given in table 1.…”
Section: Introductionmentioning
confidence: 95%
“…For instance, Thacker et al (2010) reported a slight increase in St from 0.22 to 0.25 over the rear window with Re increasing from 4.5 × 10 5 to 9.0 × 10 5 based on hot-wire measurements. But Joseph et al (2012) measured using the hot-wire technique a significant rise in St from 0.33 to 0.50 over the rear window with a change in Re from 4.5 × 10 5 to 6.8 × 10 5 . Finally, numerous investigations to simulate the flow numerically call for a more complete experimental database for the validation of computational fluid dynamics (CFD) codes.…”
Section: Introductionmentioning
confidence: 99%
“…The suction and blowing can be continuous or intermittent (Gilliéron et al (2013)). Joseph et al (2011) have used pulsed jets for flow control on an Ahmed model with 25 • slant angle, they have tested four distinct configurations of flow control: rectangular pulsed jets aligned with the spanwise direction or in winglets configuration on the roof end and rectangular jets or a large open slot at the top of the rear slant. The authors showed that depending on the used configuration the jet velocity or the pulsation frequency or the both are key parameters to optimize the drag reduction, for all studied cases the maximum drag reductions obtained are between 6 and 8%.…”
Section: Introductionmentioning
confidence: 99%