Observations and implications of natural laminar flow on practical airplane surfaces

Holmes, Bruce J.; Obara, Clifford J.

doi:10.2514/3.48203

Cited by 22 publications

(9 citation statements)

References 7 publications

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“…There are many examples of bodies of revolution, sailplanes, low speed aircraft and business jets that have utilized NLF for drag reduction (Holmes & Obara 1982). The extension to higher subsonic speeds, which requires wing sweep.…”

Section: Favorable Pressure Gradient -'Shaping'mentioning

confidence: 99%

Dialogue on Progress and Issues in Stability and Transition Research

Morkovin

Reshotko

1990

Laminar-Turbulent Transition

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Section: Favorable Pressure Gradient -'Shaping'mentioning

confidence: 99%

Dialogue on Progress and Issues in Stability and Transition Research

Morkovin

Reshotko

1990

Laminar-Turbulent Transition

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“…The technique most commonly used at RAE in recent years is that involving the sublimation of a layer of naptha crystals dissolved in petroleum ether, as reported by Pringle and Main-Smith' 5 ' and used recently by Holmes and Obara' 6 '.…”

Section: Selection Of Methodsmentioning

confidence: 99%

Recent experience in the RAE 5 metre wind tunnel of a china clay method for indicating boundary layer transition

Moir¹

1986

Aeronaut. j.

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“…With respect to the application of laminar flow, the design of a swept wing is constrained by three primary transition mechanisms, namely transition caused by Tollmien-Schlichting instabilities and crossflow instabilities as well as attachment line transition. [6][7][8] To prevent boundary-layer instability effects at high Reynolds numbers, the leading edge sweep angle for a standard medium sized aircraft equipped with NLF is limited to values around 10-15 • . 5 This limitation would result in an undesirable reduction of cruise speed.…”

Section: Natural Laminar Flow Aircraft Conceptmentioning

confidence: 99%

Analysis of Natural Laminar Flow Aircraft based on Airline Network Design and Fleet Assignment

Braun

Wicke

Koch

et al. 2011

11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference

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This paper demonstrates the evaluation of a future aircraft concept equipped with natural laminar flow technology (NLF) based on airline network design and fleet assignment. NLF leads to higher fuel efficiency compared to existing state-of-the-art short-to-medium haul aircraft. The evaluation approach based on network modeling allows to capture network effects such as fleet utilization. Network effects are not captured by a cost benefit analysis applied to standard flight missions. In this study networks are designed for different air transportation scenarios, whereas the flight schedule of an existing European low-cost carrier serves as candidate flight list. Fleet assignment is solved simultaneously by considering a baseline aircraft and the future aircraft concept as candidate fleets. The resulting networks are evaluated with respect to global network profitability, fuel consumption and fleet composition. Results reveal a significant impact of the natural laminar flow performance on fleet deployment and network contribution of the future concept. Further, results indicate turnaround time to be an important driver for fleet deployment caused by network effects.

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Observations and implications of natural laminar flow on practical airplane surfaces

Cited by 22 publications

References 7 publications

Dialogue on Progress and Issues in Stability and Transition Research

Dialogue on Progress and Issues in Stability and Transition Research

Recent experience in the RAE 5 metre wind tunnel of a china clay method for indicating boundary layer transition

Analysis of Natural Laminar Flow Aircraft based on Airline Network Design and Fleet Assignment

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