Design philosophy of long range LFC transports with advanced supercritical LFC airfoilsThe achievement of 70 percent laminar flow using modest boundary layer suction on the wings, empennage, nacelles, and struts of long-range LFC transports, combined with larger wing spans and lower span loadings, could make possible an unrefuelled range halfway around the world up to near sonic cruise speeds with large payloads. It is shown that supercritical LFC airfoils with undercut front and rear lower surfaces, an upper surface static pressure coefficient distribution with an extensive low supersonic flat rooftop, a far upstream supersonic pressure minimum, and a steep subsonic rear pressure rise with suction or a slotted cruise flap could alleviate sweep-induced crossflow and attachment-line boundary-layer instability. Wing-mounted superfans can reduce fuel consumption and engine tone noise.
Document ID
19890026157
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pfenninger, Werner (Analytical Services and Materials, Inc. Hampton, VA, United States)
Vemuru, Chandra S. (Analytical Services and Materials, Inc. Hampton, VA, United States)