Progress towards a theory of jet-flap thrust recovery

Bevilaqua, Paul M.; Schum, Eugene F; Woan, C.

doi:10.1017/s0022112084000884

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…The jet flap (Davidson, 1956) is a flap in the form of a jet emerging out of the wing trailing edge. Although the jet flap was originally conceived as a high-lift device (Davidson, 1956), it was subsequently found to reduce also drag (Bowden et al, 1974;Chin et al, 1975;Bevilaqua et al, 1984). The distributed propulsion, jet flap scheme is about engines or fans embedded in the wing exhausting through fishtail ducts from jet flaps along the trailing edge of the wing (Kehayas, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Lift coefficients of jet-flapped wings are as high as would be expected of a flap at an equivalent deflection angle. Kim and Saunders' work (2003) is supported either directly by Chin et al (1975) and Kim et al (2006) or indirectly as thrust recovery by Garland (1964), Davidson (1956) and Bevilaqua et al (1984) among others. Research by Schetz et al (2010) does not exactly reach the same conclusions.…”

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confidence: 99%

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A Laminar Flow, Propulsive, Jet-Flapped Concept for Electrically Powered Transport Aircraft

Kehayas

2023

Aviation

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Friction drag constitutes approximately half of the total drag of subsonic civil transport aircraft at cruise conditions. Several means were examined to control the flow over an aircraft and achieve laminar flow. Here, a new concept for friction drag reduction in the form of an integration of the aerodynamics and propulsion of the aircraft is put forward. Engines buried in the wing and at the rear of the fuselage suck the boundary layer of the entire wing and fuselage surface, and then, they used it as intake air and exhaust through ducts. At the wings, the engines exhaust in the form of a jet flap at the trailing edge providing distributed propulsion. By this laminar flow, propulsive concept laminar flow is established over the entire aircraft, resulting in substantial drag reduction. The analysis showed that out of the four electrically powered aircraft versions considered only the combined lift distribution with tailless fuselage is about to be feasible. It was also found that the example aircraft design is inappropriate. It is expected that a design purposely based on the proposed concept would bring electrically powered transport aircraft within the specific energy levels of present batteries.

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