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Materials Selection for High Temperature Metal Recuperators

[+] Author Affiliations
Mark A. Harper, Gaylord D. Smith

Special Metals Corporation

Philip J. Maziasz, Robert W. Swindeman

Oak Ridge National Laboratory

Paper No. 2001-GT-0540, pp. V001T04A004; 6 pages
  • ASME Turbo Expo 2001: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery
  • New Orleans, Louisiana, USA, June 4–7, 2001
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7850-7
  • Copyright © 2001 by ASME


One method of increasing the efficiency of gas turbines is the use of a heat exchanger to capture energy from the exhaust gas of the system. In particular, prime-surface and plate-fin recuperators are used to simply transfer heat from the turbine exhaust to the air leaving the compressor discharge and entering the combustor. In so doing, less fuel is required to heat the inlet air to the final combustion temperature. Desirable material requirements include a low coefficient of thermal expansion, high thermal conductivity, high temperature strength, adequate environmental resistance and good fabrication characteristics. For most industrial applications the 300 and 400 series stainless steels are currently used for the material of construction. This paper discusses the properties of higher Ni-containing alloys and their possible use as recuperator materials for advanced microturbines currently being developed.

Copyright © 2001 by ASME



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