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Hypersonic Engine Leading Edge Experiments in a High Heat Flux, Supersonic Flow EnvironmentA major concern in advancing the state-of-the-art technologies for hypersonic vehicles is the development of an aeropropulsion system capable of withstanding the sustained high thermal loads expected during hypersonic flight. Three aerothermal load related concerns are the boundary layer transition from laminar to turbulent flow, articulating panel seals in high temperature environments, and strut (or cowl) leading edges with shock-on-shock interactions. A multidisciplinary approach is required to address these technical concerns. A hydrogen/oxygen rocket engine heat source has been developed at the NASA Lewis Research Center as one element in a series of facilities at national laboratories designed to experimentally evaluate the heat transfer and structural response of the strut (or cowl) leading edge. A recent experimental program conducted in this facility is discussed and related to cooling technology capability. The specific objective of the experiment discussed is to evaluate the erosion and oxidation characteristics of a coating on a cowl leading edge (or strut leading edge) in a supersonic, high heat flux environment. Heat transfer analyses of a similar leading edge concept cooled with gaseous hydrogen is included to demonstrate the complexity of the problem resulting from plastic deformation of the structures. Macro-photographic data from a coated leading edge model show progressive degradation over several thermal cycles at aerothermal conditions representative of high Mach number flight.
Document ID
19950007885
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Gladden, Herbert J.
(NASA Lewis Research Center Cleveland, OH, United States)
Melis, Matthew E.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1994
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.15:106742
NASA-TM-106742
E-9152
Meeting Information
Meeting: Winter Annual Meeting
Location: Chicago, IL
Country: United States
Start Date: November 6, 1994
End Date: November 11, 1994
Accession Number
95N14299
Funding Number(s)
PROJECT: RTOP 505-62-52
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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