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

By Albert L. Braslow, NASA History Division

First released in 1999 as quantity thirteen within the NASA "Monograph in Aerospace historical past" sequence. This examine comprises images and illustrations.

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Boeing pilots flew the airplane at transport cruise Mach numbers and altitudes. The primary goal was to establish the aerodynamics of HLFC at Reynolds numbers associated with medium-size transport airplanes to reduce industry 83 L/D is a significant measure of aerodynamic performance. 84 “Krueger” designates a specific type of leading-edge high-lift device (flap) that retracts into the wing lower surface. 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.

In order not to increase pilot workload in the operation of LFC airplanes, the suction system was operated in a hands-off mode (except for on-off inputs). 71 Specifically, during four years of flight testing from November 1983 to October 1987, no dispatch delays were caused by LFC systems. Laminar flow was obtained over the 69 After the early JetStar flight tests on the effectiveness of wetting the leading-edge surfaces for prevention of insect adherence, analyses and wind-tunnel tests of live-insect impacts were made by both Lockheed and Douglas to develop detailed arrangements of leading-edge-protection methods for their selected LFC configurations.

R. Lacey, Feasibility and Benefits of Laminar Flow Control on Supersonic Cruise Airplanes (Washington, DC: NASA Contractor Report 181817, July 1989); Boeing Commercial Airplane Company, Application of Laminar Flow Control to Supersonic Transport Configurations (Washington, DC: NASA Contractor Report 181917, July 1990). 94 NASA flight-test participants were: Dana Purifoy and Mark P. Stucky, research pilots; Marta R. Bohn-Meyer and Carol A. Reukauf, project managers; Michael P. Harlow, aircraft crew chief; Lisa J.

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