Fundamentals in Coanda Flap Design

Radespiel, Rolf; Burnazzi, Marco

doi:10.1007/978-3-319-11967-0_7

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…A photograph of the test model is shown in Figure 3, with the screw holes on the model's surface all filled in the test. the main wing was fixed with a hinge, and the TE slot was easily established at the position where the main wing and flap were connected [13]. This will be introduced into the Numerical Calculation section to determine the position of the LE slot.…”

Section: Air Supply Device and Methodsmentioning

confidence: 99%

“…The LE and TE slots were set at 3%c and 63%c, respectively, from the LE, and these slots were typically tangent to the surface. The TE of the main wing was fixed with a hinge, and the TE slot was easily established at the position where the main wing and flap were connected [13]. This will be introduced into the Numerical Calculation section to determine the position of the LE slot.…”

Section: Test Modelmentioning

confidence: 99%

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Experimental Investigation on the Combined Blowing Control of a Hybrid Wing Body Aircraft

et al. 2023

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Combined blowing was performed on a Hybrid Wing Body (HWB) aircraft through wind tunnel testing at a Reynolds number of 1.75 × 106. The full cycle of separation and reattachment under the control of combined blowing was implemented using Computational Fluid Dynamics (CFD), and the mechanism of combined blowing inhibiting separation was analyzed. The aerodynamic characteristics of the baseline and the independent effects of the blown deflected trailing edge (TE), blown leading edge (LE), and combined blowing on the TE and LE were investigated. The results clearly show that combined blowing can inhibit the development of cross-flow, reduce the accumulation of a boundary layer at the tip, and inhibit the flow separation effect. The effect of using seamless simple flaps alone to increase the lift is limited; blowing control is required to enhance the lift further. Applying the blown deflected TE can improve the lift linear segment, so that 30° flap achieves the lift gain of 40° flap without control, while the drag coefficient is approximately 0.02 smaller, but the stall gradually advances. Using the blown LE can significantly increase the stall angle from 12° to 18°. However, the lift linear segment remains unaffected. In particular, combined blowing can achieve the control effect of improving the lift linear segment, delaying stall, and decreasing drag. Moreover, the maximum lift coefficient is approximately 0.19, and the lift-to-drag ratio increment in the control state with a 30° flap deflection angle is above 2.2 in the angle of attack range of 4° to 12° compared to the uncontrolled state with a 40° flap deflection angle.

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Section: Air Supply Device and Methodsmentioning

confidence: 99%

Section: Test Modelmentioning

confidence: 99%

Experimental Investigation on the Combined Blowing Control of a Hybrid Wing Body Aircraft

et al. 2023

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“…Coanda flaps can provide such flexibility. Figure 12 displays the range of maximum lift coefficients that can be obtained with different leading-edge devices and with and without suction, with a 65° Coanda flap (20,21) . Suited combinations of leading-edge device and suction open up a very broad range of achievable lift coefficients.…”

Section: Tangential Blowingmentioning

confidence: 99%

Active flow control for high lift with steady blowing

et al. 2016

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The general picture of research in active flow control for aircraft applications has been continuously changing over the last 20 years. Researchers can now obtain design sensitivities by using numerical flow simulations, and new optical experimental methods can be used that measure flow field data non-intrusively in planes and volumes. These methodological advances enabled significant knowledge increase. The present paper reviews recent progress in active flow control by steady blowing. It appears that two strategies of blowing deserve particular attention. The first uses tangential blowing of thin wall jets to overcome the adverse pressure gradients from locally very large flow turning rates. This approach exploits the potentials of the Coanda effect. The second strategy employs oblique blowing of air jets designed to generate longitudinal vortices in the boundary layer. The longitudinal vortices provide convective redistribution of momentum in the boundary layer, and they also enhance turbulent momentum transport. The sensitivities of these two approaches as observed in fundamental flow investigations and in applications to high-lift aerofoils are described and suited efficiency parameters of blowing are analysed.

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