30 March 2006 Technological assessment of sensing systems in propulsion systems in high temperature zones
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Abstract
Presently there exists no way for direct measurement of strain at high temperature in engine components such as combustion chamber, exhaust nozzle, propellant lines and turbine blades and shaft. Existing fatigue and life prediction studies for high temperature zones in propulsion systems depend on strain/stress values computed from indirect measurements of temperature, flow velocity, pressure, et al. Thermomechanical fatigue (TMF) prediction, which is a critical element for blade design, is a strong function of the temperature and strain profiles. Major uncertainties arise from the inability of current instrumentation to measure temperature and strain at the critical locations. This prevents the structural designer from optimizing the blade design high temperature environment, which is a significant challenging problem in engine design. Ability to measure directly strains in different high temperature zones would deeply enhance the effectiveness of aircraft propulsion systems for fatigue damage assessment and life prediction. State of the art for harsh environment high temperature sensors has improved considerably for the past few years. This paper lays down specifications for high temperature sensors and does the technological assessment of these new sensing technologies. This paper presents a review of the recent advances made in harsh environment sensing systems and takes a peek at the future of such technologies.
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Anindya Ghoshal, Heung Soo Kim, "Technological assessment of sensing systems in propulsion systems in high temperature zones", Proc. SPIE 6179, Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring II, 617908 (30 March 2006); doi: 10.1117/12.660549; https://doi.org/10.1117/12.660549
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