Numerical Investigation of Unsteady Blowing Through Discrete Slots on a Swept Vertical Tail of Infinite Span

Gebhardt, Anna

doi:10.2514/6.2017-3244

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…values. This is something which has already been observed by Gebhardt [32] who concluded that pulsed blowing is more effective than steady blowing for low C μ values and the opposite conclusion for high C μ values. One can also observe that the higher the freestream velocity, the (slightly) higher the lift increment with sweeping jets.…”

Section: Comparison Between Continuous/pulsed Blowing Segmented Slotsupporting

confidence: 75%

“…Before testing the sweeping jets in the next section, the effect of a segmented slot which will create 3D effects on the flow (contrary to the two previous sections where the effect of the control was mostly 2D) has been investigated like in Gebhart [32]. Since the sweeping jets will blow through isolated slots with a spanwise spacing of several percent of the span, the idea was to investigate the effect of this segmentation of the blowing alone without the additional sweeping effect.…”

Section: Segmented Slotmentioning

confidence: 99%

“…A decrease of the slot width enables a reduction of the mass flow rate to reach the same value of the lift coefficient. In Gebhardt [32], a continuous and a segmented slot were compared and it was observed that a segmented slot enables a reduction of the mass flow rate to reach the same lift increment. The present paper is composed of two parts.…”

Section: Introductionmentioning

confidence: 99%

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Performance Enhancement of a Vertical Tail Model with Sweeping Jets

2020

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Active flow control to delay the flow separation on the rudder of two different models has been investigated in the ONERA L1 wind tunnel. The first model was used as a simplified test case and consisted in a flat plate with a rudder. Different types of actuation were investigated: continuous/pulsed blowing through slots, continuous blowing through segmented slots and sweeping jets. The lift increments of these different types of actuation were compared not only in terms of mass flow rate but also in terms of momentum and power coefficients. Active flow control by sweeping jets was selected to be tested on the second model which is a scale 1:2 vertical tail model of a generic business jet. Side force increments up to 80% were achieved with a 2% value of C μ coefficient. Side force increments of 50% were also reached with a lower C μ value of 0.5%. These side force increments could lead to a reduction of vertical tail plane wetted area and weight and consequently to a reduction of drag cruise and fuel consumption.

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Section: Comparison Between Continuous/pulsed Blowing Segmented Slotsupporting

confidence: 75%

Section: Segmented Slotmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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