Wind-Tunnel Study of a Wing-Embedded Lifting Fan Remaining Open in Cruise Flight

Hoeveler, Bastian; Bauknecht, André; Wolf, Claus; Janser, Frank

doi:10.2514/1.c035422

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Research on the ducted fan has been actively implemented from the early 2000s until recently, and the studies were mainly focused on a single ducted fan for a small UAV (unmanned aerial vehicle) that requires VTOL (vertical take-off and landing) ability in the 2000s [1][2][3]. After the 2010s, as VTOL vehicles of various concepts including small UAVs were introduced, various forms of ducted fans appeared naturally such as fan-in-wing [4][5][6], multiduct [7], and coaxial [8,9] types. In addition, studies have been conducted on the performance of ducted fans in various ways.…”

Section: Introductionmentioning

confidence: 99%

A Study on Hover Performance of Ducted Fans for an Unmanned VTOL Aircraft

Choi

Wie

Chae

2022

International Journal of Aerospace Engineering

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In this study, ground tests and numerical analysis were performed to verify the hover performance of the second ducted fan model designed by this research team. Shape of the duct inner surface was asymmetric in longitudinal direction, and considering various aspects such as test site or costs for test operation, a 40% scaled-down model of the ducted fan was adopted for this study. Both the results of the tests and the analysis were found to be coherent, and it was verified that the ducted fan was verified to be well designed to achieve the targeted performance. Furthermore, the performance of this ducted fan was compared with that of the symmetric one to determine the effects of the difference in the duct shape on the performance. It was observed that the symmetric ducted fan performs better in hovering flight, although the asymmetric ducted fan was sufficiently satisfied with the design intention.

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Section: Introductionmentioning

confidence: 99%

A Study on Hover Performance of Ducted Fans for an Unmanned VTOL Aircraft

Choi

Wie

Chae

2022

International Journal of Aerospace Engineering

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Aerodynamic Investigation of a New Layout for eVTOL Aircraft

Chen,

Chow,

Qiao

2024

2023 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2023) Proceedings

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Double-Ducted Fan as an Effective Lip Separation Control Concept for Vertical-Takeoff-and-Landing Vehicles

Aktürk

2022

Journal of Aircraft

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This paper describes a novel inlet flow conditioning concept that significantly improves ducted fans' performance and controllability. High angle of attack operation of ducted fans is very common in VTOL systems. The new concept named Double Ducted Fan (DDF) uses a secondary shroud to control inlet lip-separation-related momentum deficit at the inlet of the fan rotor during edgewise flight. The DDF is helpful in a wide edgewise flight velocity range, and its corrective aerodynamic effect becomes more pronounced with increasing flight velocity. A conventional baseline duct operating at 90 o angle of attack is compared to other novel double ducted fan designs via 3D, viscous, and turbulent flow computations. A custom actuator-disk model replaces the zonal computation of the complex and three-dimensional rotor flow field in the rotating frame of reference. Both hover and edgewise flight conditions are considered around the ducted fan unit and inside the ducts. Significant improvements from several novel ducted fan designs are in the areas of vertical thrust enhancement, noseup pitching moment reduction, and recovery of fan through-flow mass flow rate in a wide horizontal flight range. A variable DDF design (VDDF), a partial DDF design (PDDF), and a Fan-in-Wing implementation of the DDF are introduced.

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Wind-Tunnel Study of a Wing-Embedded Lifting Fan Remaining Open in Cruise Flight

Cited by 3 publications

References 16 publications

A Study on Hover Performance of Ducted Fans for an Unmanned VTOL Aircraft

A Study on Hover Performance of Ducted Fans for an Unmanned VTOL Aircraft

Aerodynamic Investigation of a New Layout for eVTOL Aircraft

Double-Ducted Fan as an Effective Lip Separation Control Concept for Vertical-Takeoff-and-Landing Vehicles

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