NDLI: Mach 5 electroformed nickel nozzle refurbishment fnas investigation of ultra-smooth surfaces

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Mach 5 electroformed nickel nozzle refurbishment fnas investigation of ultra-smooth surfaces

Content Provider	NASA Technical Reports Server (NTRS)
Author	Griffith Sr., Charles Engelhaupt, Darell Rood, Robert
Copyright Year	1992
Description	This task is in support of the Quiet Hypersonic Wind Tunnel effort currently in effect at NASA Langley Research Center, VA. A laminar flow wind tunnel nozzle has been previously fabricated by electroforming pure nickel over a machined and polished two piece stainless steel mandrel. The mandrel was removed leaving the replicate nozzle surface. The nozzle was then pressed into a heavy stainless steel jacket for mounting features and rigidity. The original nickel surface was a replication of the polished mandrel but had degraded due to oxidation. The inside surface requirements are very stringent in order to achieve laminar or quiet flow at the desired pressure and temperature for the specific design of Mach 5. The throat area of the axisymmetric device must have a surface finish with no defects greater than 16 microinches. This requires an rms average background of about four microinches or better for inspection purposes. A coating of nickel-phosphorous alloy was applied by catalytic deposition and then the inside of the nozzle was polished retaining dimensional and surface finish tolerances as specified per drawings supplied. Since the unit is not an optical component, conventional optical inspection methods for surface finish and figure are not readily achieved. Measurements were made using surface profilometry.
File Size	536839
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930005492
Archival Resource Key	ark:/13960/t09w5c37q
Language	English
Publisher Date	1992-01-01
Access Restriction	Open
Subject Keyword	Spacecraft Propulsion And Power Nickel Alloys Metal Surfaces Laminar Flow Electroforming Metal Polishing Visual Observation Hypersonic Wind Tunnels Profilometers Wind Tunnel Nozzles Hypersonic Nozzles Surface Finishing Deposition Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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