300 KW Class, Semi-Closed Cycle Gas Turbine Engine Design Considerations FREE

[+] Author Affiliations
C. Rodgers

ITC, San Diego, CA

Paper No. 99-GT-371, pp. V002T04A012; 9 pages
  • ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Indianapolis, Indiana, USA, June 7–10, 1999
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7859-0
  • Copyright © 1999 by ASME


The thermodynamic performances and relative sizing of small single shaft and two spool semi-closed cycle turbine engines (SCTE), for propulsion needs were studied relative to the conventional intercooled recuperative (ICR) open cycle gas turbine. The study indicated that the basic attributes of the SCTE are higher specific power, hp/pps inlet flow, a flat specific fuel consumption (SFC) characteristic, and potentially reduced exhaust emissions, at the expense of slightly higher SFC, lower power to weight ratio, and increased cost $/hp relative to the ICR.

The combustor is paramount to the successful operation of the SCTE in that the feedback (recirculated) flow, must be clean and devoid of particulates that could deposit on the heat transfer surfaces and turbo machinery. Additionally if high specific power is the primary design constraint high reticulation flow ratio combustor technology must be researched.

A conservative cycle analysis was conducted with current small gas turbine state-of-art component efficiencies and temperature limits for metallic hot-end components. The analysis was simplified by using existing gas properties for hydrocarbon air mixtures without oxygen depletion, or exhaust products in compression. Although the assumption that the intercooler and recuperator effectiveness and pressure drops remained constant provided a common datum, the part load performance analysis could benefit from the supplementation of improved heat exchanger algorithms.

Copyright © 1999 by ASME
Topics: Design , Gas turbines , Cycles
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