Life Enhancement of a Gas Turbine Engine by Temperature Control

Rajiva Prakash, S. Vittal Rao, Charles A. Skarvan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


This paper addresses the problem of enhancing the longevity of an aircraft gas turbine engine by using control strategies. Among the various component failure modes, thermal fatigue is one of major causes of damage. The approach undertaken in this paper is to reduce gas turbine inlet temperature (GTIT) of the engine. The paper considers a twin-spool turboshaft gas turbine engine to illustrate the techniques. Compressor variable geometry (CVG) setting is used as a means to meet the goal of steady state GTIT reduction. A preliminary analysis shows that it is possible to make use of CVG reset angle for reducing the steady state value of GTIT. “Linear Quadratic Gaussian with Loop Transfer Recovery” (LQG/LTR) design procedure is used to design a dynamic controller for robust stability and reducing overshoots in GTIT.

Original languageEnglish
Pages (from-to)187-206
Number of pages20
JournalInternational Journal of Turbo and Jet Engines
Issue number3-4
StatePublished - Jul 1990


  • CVG reset angle
  • Gas turbine engine
  • LQG/LTR controller
  • Robustness
  • life-enhancement
  • temperature-reduction


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