Download A History of Suction-Type Laminar-Flow Control with Emphasis by Albert L. Braslow, NASA History Division PDF

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By Albert L. Braslow, NASA History Division

First released in 1999 as quantity thirteen within the NASA "Monograph in Aerospace heritage" sequence. This research comprises photos and illustrations.

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Additional resources for A History of Suction-Type Laminar-Flow Control with Emphasis on Flight Research. Monograph in Aerospace History, No. 13, 1999

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When used for an active laminar-flow control application, the flap also shields the wing from insect impacts during takeoff and landing and when retracted under the leading edge for cruise, does not interfere with the upper-surface laminar flow. 31 xxxvi risks to acceptable levels. Results were very encouraging. Transition location was measured several feet past the end of suction and with less suction than estimated. The Krueger leading-edge flap proved effective as the insect shield. Existing manufacturing technology permitted construction of the leading-edge box to laminar-flow surface-quality requirements.

81 Hybrid Laminar-Flow Control (HLFC): Boeing 757 The hybrid laminar-flow control concept integrates active laminar-flow control with suction (LFC) and natural laminar flow (NLF) and avoids the objectionable characteristics of each. The leading-edge sweep limitation of NLF is overcome through application of suction in the leading-edge box to control crossflow and attachment-line instabilities characteristic of swept wings. 82 HLFC offers the possibility of achieving extensive laminar flow on commercial or military transport aircraft with a system 81 See Hall, “On the Mechanics of Transition,” cited in footnote 36.

USAF United States Air Force WADD Wright Air Development Division 36 xli Documents 37 xlii Document 1—Aeronautics Panel, AACB, R&D Review, Report of the Subpanel on Aeronautical Energy Conservation/Fuels.

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