Performance sensitivities and interactions between gas turbine engine components were examined analytically when changes were made to several significant component performance and operating parameters. The gas turbine engine, a two-shaft configuration called the upgraded engine, was developed by the Chrysler Corporation under a US Department of Energy contract. The early upgraded engines had a serious power shortfall, and a cooperative effort was undertaken to remedy the problem. The performance sensitivity was examined for changes to several operating and component performance parameters. One change at a time was introduced, and the performance was calculated and then compared to the reference performance. This comparison was made at gas generator speeds from 50 (idle speed) to 100%. Sensitivities were determined for changes in turbomachinery efficiency, compressor inlet temperature, power turbine discharge temperature (which was actively controlled), regenerator effectiveness, regenerator drop, and several gas flow and heat leaks. As expected, the efficiency of the compressor and the turbines strongly affected performance. Compressor efficiency, which had the strongest effect on system performance, was closely followed by compressor-drive turbine and power turbine efficiencies. Efficiency changes to either the compressor or compressor-drive turbine efficiencies resulted in a shift in the operating point of the other two machines. For constant shaft speeds and power turbine dischrge temperature, increasing the compressor efficiency resulted in reduced pressure ratio for the compressor-drive turbine and increased pressure ratio for the power turbine. Changes to power turbine efficiency did not affect the operating point of the other two machines. A tabulation of influence coefficients for several dependent variables is included for gas generator speeds from 50 to 100%. (ERA citation 05:013854)

  • Corporate Authors:

    Department of the Navy

    The Pentagon
    Washington, DC  United States  20350

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Johnsen, R L
  • Publication Date: 1979-12

Media Info

  • Pagination: 37 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00317726
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NASA-TM-79242
  • Contract Numbers: EC-77-A-31-1040
  • Files: TRIS
  • Created Date: Dec 30 1980 12:00AM