Development of advanced circulation control wing high-lift airfoils

Englar, Robert J.; Huson, Gregory G.

doi:10.2514/3.44996

Cited by 68 publications

(20 citation statements)

References 2 publications

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“…However, these designs also produced very high drag [6]. Such high drag levels associated with a blunt, large radius trailing edge can be prohibitive under cruise conditions when Circulation Control is no longer necessary.…”

Section: Introductionmentioning

confidence: 99%

Computational Evaluation of the Steady and Pulsed Jet Effects on the Performance of a Circulation Control Wing Section

Liu

Sankar

Englar

et al. 2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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Circulation Control technology is a very effective way of achieving high lift forces required by aircraft during take-off and landing. This technology can also directly control the flow field over the wing. Compared to a conventional high-lift system, a Circulation Control Wing (CCW) can generate comparable or higher lift forces during take-off/landing with fewer or no moving parts and much less complexity. In this work, an unsteady three-dimensional Navier-Stokes analysis procedure has been developed and applied to Circulation Control Wing configurations. The effects of 2-D steady jets and 2-D pulsed jets on the aerodynamic performance of CCW airfoils have been investigated. It is found that a steady jet can generate very high lift at zero angle of attack without stall, and that a small amount of blowing can eliminate vortex shedding at the trailing edge, a potential noise source. It is also found that a pulsed jet can achieve the same high lift as a steady jet at lower mass flow rates, especially at a high frequency, and that the Strouhal number has a more dominant effect on the pulsed jet performance than just the frequency or the free-stream velocity.

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Section: Introductionmentioning

confidence: 99%

Computational Evaluation of the Steady and Pulsed Jet Effects on the Performance of a Circulation Control Wing Section

Liu

Sankar

Englar

et al. 2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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show abstract

“…The dimensionless slot height is h/c = 0.001 for this case. In the cross section the airfoil with a dual-radius flap is shown in Figure 16 [15]. Figure: 16 A dual-radius circulation control airfoil [15] A flap of about 10% chord radius pivots around a hinge.…”

Section: Test Case 3 Cross-section Of An Aircraft Wing With Blown Flapmentioning

confidence: 99%

“…In the cross section the airfoil with a dual-radius flap is shown in Figure 16 [15]. Figure: 16 A dual-radius circulation control airfoil [15] A flap of about 10% chord radius pivots around a hinge. Because the upper surface of the flap has such a curvature that the Coanda effect can be exploited even at higher flow turning angles.…”

Section: Test Case 3 Cross-section Of An Aircraft Wing With Blown Flapmentioning

confidence: 99%

Blowing jets as a circulation flow control to enhancement the lift of wing or generated power of wind turbine

Dumiţrache¹,

Frunzulică²,

Dumitrescu³

et al. 2014

INCAS BULLETIN

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The goal of this paper is to provide a numerical flow analysis based on RANS equations in two directions: the study of augmented high-lift system for a cross-section airfoil of a wing up to transonic regime and the circulation control implemented by tangentially blowing jet over a highly curved surface due to Coanda effect on a rotor blade for a wind turbine. This study were analyzed the performance, sensitivities and limitations of the circulation control method based on blowing jet for a fixed wing as well as for a rotating wing. Directions of future research are identified and discussed.

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“…Circulation control has been proposed as a simpler and more effective alternative to the usual high-lift devices 1 . Circulation control is an active flow control device that increases the lift coefficient without the use of complex components in freestream flow.…”

Section: 2circulation Control Technologymentioning

confidence: 99%