Exploring the Effects of Installation Geometry in High-Lift Propeller Systems

Fei, Xiaofan; Patterson, Michael D.; German, Brian

doi:10.2514/6.2018-0277

Cited by 6 publications

(2 citation statements)

References 13 publications

(12 reference statements)

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“…A popular example is the LEAPTech aircraft [4][5][6] and its successor, the X-57 Maxwell. 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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show abstract

“…Another systematic investigation of the effects of propellers' positions and orientations was performed by Fei et al [32], who tested a rectangular wing model with a plain flap spanning the entire wind tunnel height, one electric motor, and two propellers of different diameters. They highlighted the predominance of the vertical displacement of the propulsive system over the horizontal offset, although they found a different trend with the propeller's inclination with respect to Ref.…”

Section: Introductionmentioning

confidence: 99%

Aero-Propulsive Interactions between UAV Wing and Distributed Propellers Due to Their Relative Position

Ciliberti

Vecchia

Orticalco

et al. 2023

Drones

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The purpose of this paper is the evaluation of the aero-propulsive effects on a UAV wing model with distributed propulsion. An array of three propellers is placed ahead of the leading edge of a rectangular wing with flap. The investigation was performed with high-fidelity numerical analyses to provide insights into the phenomenology and to screen the interesting positions to be validated in the wind tunnel. The propellers’ array is moved into twelve different positions, allowing longitudinal and vertical translations. The wing has an untwisted and constant section profile, with a single slot trailing-edge flap that is deflected into three positions. The flap span is entirely covered by the propellers’ blowing. Results show an increment of lift, drag, and pitching moment coefficients with distributed propellers enabled. For a given thrust level, the magnitude of such increments depends on the propellers’ positions, the flap configuration, and the angle of attack. The lift enhancement sought in distributed propulsion applications comes at the expense of a significant increase in drag and pitching moment magnitude. In some combinations, the wing’s contribution to the aircraft longitudinal stability is severely affected. Conversely, the propellers’ inflow is altered such that thrust is increased in all the investigated configurations, with a small reduction of propulsive efficiency.

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Performance Trade-offs and Operations of Electric Boosted Aircraft for 2030 Single-Aisle Market

Balkas

Shi

Gladin

et al. 2022

2022 IEEE Transportation Electrification Conference &Amp; Expo (ITEC)

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Exploring the Effects of Installation Geometry in High-Lift Propeller Systems

Cited by 6 publications

References 13 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

Aero-Propulsive Interactions between UAV Wing and Distributed Propellers Due to Their Relative Position

Performance Trade-offs and Operations of Electric Boosted Aircraft for 2030 Single-Aisle Market

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