NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Materials for a Stirling engine heater headWork done on the 25-kW advanced Stirling conversion system (ASCS) terrestrial solar program in establishing criteria and selecting materials for the engine heater head and heater tubes is described. Various mechanisms contributing to incompatibility between materials are identified and discussed. Large thermal gradients, coupled with requirements for long life (60,000 h at temperature) and a large number of heatup and cooldown cycles (20,000) drive the design from a structural standpoint. The pressurized cylinder is checked for creep rupture, localized yielding, reverse plasticity, creep and fatigue damage, and creep ratcheting, in addition to the basic requirements for bust and proof pressure. In general, creep rupture and creep and fatigue interaction are the dominant factors in the design. A wide range of materials for the heater head and tubes was evaluated. Factors involved in the assessment were strength and effect on engine efficiency, reliability, and cost. A preliminary selection of Inconel 713LC for the heater head is based on acceptable structural properties but driven mainly by low cost. The criteria for failure, the structural analysis, and the material characteristics with basis for selection are discussed.
Document ID
19910053520
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Noble, J. E.
(Stirling Technology Co. Richland, WA, United States)
Lehmann, G. A.
(Stirling Technology Co. Richland, WA, United States)
Emigh, S. G.
(Stirling Technology Co. Richland, WA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Metallic Materials
Meeting Information
Meeting: Intersociety Energy Conversion Engineering Conference
Location: Reno, NV
Country: United States
Start Date: August 12, 1990
End Date: August 17, 1990
Accession Number
91A38143
Funding Number(s)
CONTRACT_GRANT: DEN3-377
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available