Aerodynamic Effects of Propeller Slipstream on a Wing with Circulation Control

Beck, Nils; Radespiel, Rolf; Lenfers, Carsten; Friedrichs, Jens; Rezaeian, Alireza

doi:10.2514/1.c032901

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…Out of modern literature on PWF systems, most focus on impact on wing performance metrics [7][8][9], but often do not characterize the phenomena that these metrics are dominated by. Others focus on reduced-order modeling capabilities [10] or consider non-standard flap configurations that make it difficult to relate to slotted multi-element wings [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Aerodynamic Interactions of a Wing with Deployed Fowler Flap under Influence of a Propeller Slipstream

Duivenvoorden

Suard

Sinnige

et al. 2022

AIAA AVIATION 2022 Forum

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Experiments were performed using a wall-to-wall unswept and untapered wing with a single slotted flap and a propeller, to obtain a validation dataset and gain insight into primary flow phenomena in propeller-wing-flap interactions. Measurements were taken using pressure taps, a wake rake and oil flow visualization, for several flap deflections (0, 15 and 30 degrees) and thrust settings (unpowered, 𝐽 = 0.8 / 𝑇 𝑐 = 1.05 and 𝐽 = 1.0 / 𝑇 𝑐 = 0.45). Similarity of the measured data to similar experiments was poor, which was believed to be due to the low Reynolds number of 𝑅𝑒 = 6𝑒5 and sensitivity of local measurements due to occurrence of stall cells. Oil flow visualizations showed significant induction of flow separation from nacelle-wing interactions in unpowered conditions, traced to boundary layer growth. For powered cases it was shown that both sides of the deployed flap are immersed in the part of the slipstream that passes the pressure side of the main element. This part of the slipstream deforms significantly before it reaches the flap and thus results in complex spanwise variations for the flap flow. This stresses the need to investigate slipstream development in propeller-wing-flap systems and the effects on flap flow specifically to gain in-depth understanding of the interactions. The results presented in this paper expose the inherent complexity of investigating propeller-wing-flap systems and gaining viable validation data, and might serve to guide for future investigations of propeller-wing-flap systems.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Aerodynamic Interactions of a Wing with Deployed Fowler Flap under Influence of a Propeller Slipstream

Duivenvoorden

Suard

Sinnige

et al. 2022

AIAA AVIATION 2022 Forum

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“…The Coanda effect is real, and arises due to viscosity, but applies to jets of fluid which are not present around a simple aerofoil. That said, high lift devices can make use of the Coanda effect, such as the blow flaps of the Blackburn Buccaneer and the Lockheed F-104 Starfighter (Beck et al 2015). Mclean (2018) inaccurately states 'most wings are of high enough aspect ratio that the flow in cross sections is qualitatively the same as if the span were infinite, and the flow were two dimensional.'…”

Section: Discussionmentioning

confidence: 99%

Is that lift diagram correct? A visual study of flight education literature

Wild

2023

Phys. Educ.

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With a complex topic such as aerodynamics, subtle points are critical. In this work images illustrating air flow around wings and aerofoils were studied to explore misunderstandings in aerodynamics education. While these images are common in textbooks and popular science media, this study was limited to the 135 physics education articles on the topic of lift, of which 49 contained illustrations of air flow around an aerofoil or wing. These 49 cases were included for qualitative comparison using visual semiotics. It was found that 28% of images did not include upwash, and only 44% included stagnation points. For the case of 2D flow around aerofoils 30% were illustrated correctly, while for wings 75% were correct. These results excluded the seven completely incorrect illustrations where common misconceptions were presented as facts. Most illustrations of flow around an aerofoil incorrectly depicted flow around a wing.

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“…Since propeller propulsion has a long history in aviation, many studies have been performed on its integration with other aircraft components. It was recognized that the aerodynamic interaction between the propeller and other aerodynamic surfaces produces both time-averaged and unsteady loads which have an effect on the aircraft aerodynamic performance, stability and control, structural loading, and production of noise and vibration [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Configurations with Optimum Swirl Recovery for Propeller Propulsion Systems

Liu

Eitelberg

et al. 2019

AIAA Journal

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This paper addresses the design of swirl recovery vanes (SRVs) for propeller propulsion in tractor configuration at cruise conditions using numerical tools. A multi-fidelity optimization framework is formulated for the design purpose, which exploits low-fidelity potential flow-based analysis results as input for high-fidelity Euler equationbased simulations. Furthermore, a model alignment procedure between low-and high-fidelity models is established based on a shape-preserving response prediction algorithm. Two cases of swirl recovery are examined. The first is the swirl recovery by the trailing wing which leads to a reduction of the lift-induced drag. This is achieved by the optimization of the wing twist distribution. The second case is swirl recovery by a set of stationary vanes, which leads to production of additional thrust. In the latter case, four configurations are evaluated by locating the vanes at different azimuthal and axial positions relative to the wing. An optimum configuration is identified where the vanes are positioned on the blade-downgoing side downstream of the wing. For the configuration and conditions examined, the wing twist optimization reduces the induced drag by 3.9 counts (5.9% of wing induced drag), while the optimized 4-bladed SRVs lead to an induced-drag reduction of 6.1 counts (9.2% of wing induced drag).

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Aerodynamic Effects of Propeller Slipstream on a Wing with Circulation Control

Cited by 11 publications

References 8 publications

Experimental Investigation of Aerodynamic Interactions of a Wing with Deployed Fowler Flap under Influence of a Propeller Slipstream

Experimental Investigation of Aerodynamic Interactions of a Wing with Deployed Fowler Flap under Influence of a Propeller Slipstream

Is that lift diagram correct? A visual study of flight education literature

Numerical Investigation of Configurations with Optimum Swirl Recovery for Propeller Propulsion Systems

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