The feasibility of delaying the transition from laminar to turbulent flow over aerodynamic surfaces by cooling those surfaces, to decrease friction and increase fuel economy of aircraft, is discussed. For the 'energy crisis', hydrogen is being considered as an alternate fuel, so its cryogenic properties may be used for cooling below the 280 R known to stabilize boundary layers. Equations for the stability analysis of a two-dimensional, compressible, laminar boundary layer are presented, including heat transfer and adverse pressure gradient effects which constitute the principal new technological contribution of this study, for near-cruise flight. Preliminary systems analysis for an advanced commercial transport shows drag reductions near 27 % and lower direct operating costs (DOC) by over 21 %. (Wassmann)
Laminar flow stabilization by surface cooling on hydrogen fueled aircraft
Stabilisierung laminarer Stroemung durch Oberflaechenkuehlung beim Flugzeug mit Wasserstoffantrieb
AIAA-Papers ; 1-11
1979
11 Seiten, 8 Bilder, 1 Tabelle, 30 Quellen
Conference paper
English
Aerodynamic Surface Cooling for Laminar Flow Control for Hydrogen-Fueled Subsonic Aircraft
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