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“…Without curved appendices, steady blowing increases base pressure by approximately 5 %, reducing the drag by at most 3 % in the range C µ ∈ [0, 0.015], corresponding to blowing velocities V j /U o ∈ [0, 1.1]. This performance agrees with drag reductions obtained by previous studies with similar steady jet amplitudes in axisymmetric or square-back models (Freund & Mungal 1994;Wassen et al 2010;Krentel et al 2010). In the case of steady blowing, while no difference is measured up to C µ ∼ 7.5 × 10 −3 (V j /U o ∼ 0.55), the Coanda effect improves base pressure recovery at higher blowing velocities.…”
Section: Impact On the Base Pressure And Wake Flowsupporting
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“…Without curved appendices, steady blowing increases base pressure by approximately 5 %, reducing the drag by at most 3 % in the range C µ ∈ [0, 0.015], corresponding to blowing velocities V j /U o ∈ [0, 1.1]. This performance agrees with drag reductions obtained by previous studies with similar steady jet amplitudes in axisymmetric or square-back models (Freund & Mungal 1994;Wassen et al 2010;Krentel et al 2010). In the case of steady blowing, while no difference is measured up to C µ ∼ 7.5 × 10 −3 (V j /U o ∼ 0.55), the Coanda effect improves base pressure recovery at higher blowing velocities.…”
Section: Impact On the Base Pressure And Wake Flowsupporting
“…Rouméas et al (2008) used steady aspiration on the top of the slant: he obtained numerically a drag reduction of 17% and noticed experimentally a suppression of the separation area (Rouméas 2006). Experimental studies were carried out by Leclerc (2008) with synthetic jets (zero net mass flux) at the top slant edge area (8.5% reduction) and by Krentel et al (2010) with pulsed jets at the bottom slant edge (5.7% reduction). Both Krajnovic et al (2009) and Lehugeur (2009) made numerical simulations of the same case: the former obtained a little bit more than 7% reduction using steady blowing and suction at the slant top edge (and also studied several other blowing locations and jet types), while the latter used steady blowing to force the bursting of longitudinal coherent structures, leading to a 6% drag reduction.…”
Section: Introductionmentioning
“…Increasing the momentum coefficient beyond 0.04 provides only small further savings, mostly due to the thrust of the actuation jets. Since this effect would also be present in an application to a real vehicle, we rate the AFC efficiency by calculating the net power savings ∆P/P 0 , as suggested by Krentel et al 30 For the baseline case without actuation the power…”
Section: Flow Characteristicsmentioning