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Experimental and CFD study of slotted Krueger flaps aerodynamics in critical locations

Experimental and CFD study of slotted Krueger flaps aerodynamics in critical locations Some recent effort showed that usage of Krueger flaps helps to maintain laminar flow in cruise flight. Such flaps are positioned higher relative to the chord to shield the leading edge from the insect contamination during take-off. The flap passes several through critical intermediate position during the deployment to its design position. The purpose of this paper is to analyse the aerodynamics.Design/methodology/approachTo better understand such flow phenomena, the combined approach of computational fluid dynamics and experimental methods were used. Flow simulation was performed with in-house finite volume Navier–Stokes solver in fully turbulent unsteady RANS regime. The experimental data were obtained by means of force and pressure measurements and some areas of the flow field were examined with 2 C particle image velocimetry.FindingsThe airfoil with flap in critical position has a very limited maximum lift coefficient. The maximum achievable lift coefficient during the deployment is significantly affected by the vertical position of the trailing edge of the flap. The most unfavourable position during the deployment is not the flap perpendicular to the chord, but the flap inclined closer to it is the retracted position.Research limitations/implicationsThe flap movement was not simulated either in the simulation or in the experiment. Only intermediate static positions were examined.Practical implicationsA better understanding of aerodynamic phenomena connected with the deployment of a Krueger flap can contribute to the simpler and lighter of kinematics and also to decrease time-to-market.Originality/valueLimited experimental and computational results of Krueger flap in critical positions during the deployment are published in the literature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Numerical Methods for Heat & Fluid Flow Emerald Publishing

Experimental and CFD study of slotted Krueger flaps aerodynamics in critical locations

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Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
0961-5539
eISSN
0961-5539
DOI
10.1108/hff-09-2019-0687
Publisher site
See Article on Publisher Site

Abstract

Some recent effort showed that usage of Krueger flaps helps to maintain laminar flow in cruise flight. Such flaps are positioned higher relative to the chord to shield the leading edge from the insect contamination during take-off. The flap passes several through critical intermediate position during the deployment to its design position. The purpose of this paper is to analyse the aerodynamics.Design/methodology/approachTo better understand such flow phenomena, the combined approach of computational fluid dynamics and experimental methods were used. Flow simulation was performed with in-house finite volume Navier–Stokes solver in fully turbulent unsteady RANS regime. The experimental data were obtained by means of force and pressure measurements and some areas of the flow field were examined with 2 C particle image velocimetry.FindingsThe airfoil with flap in critical position has a very limited maximum lift coefficient. The maximum achievable lift coefficient during the deployment is significantly affected by the vertical position of the trailing edge of the flap. The most unfavourable position during the deployment is not the flap perpendicular to the chord, but the flap inclined closer to it is the retracted position.Research limitations/implicationsThe flap movement was not simulated either in the simulation or in the experiment. Only intermediate static positions were examined.Practical implicationsA better understanding of aerodynamic phenomena connected with the deployment of a Krueger flap can contribute to the simpler and lighter of kinematics and also to decrease time-to-market.Originality/valueLimited experimental and computational results of Krueger flap in critical positions during the deployment are published in the literature.

Journal

International Journal of Numerical Methods for Heat & Fluid Flow – Emerald Publishing

Published: Feb 13, 2020

Keywords: Aerodynamics; High-lift devices; Krueger flap

References

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