Optical condensation measurement in gas turbine engine inlets

Jason Potter; Ralph P. Tatam

doi:10.1117/12.279751

21 November 1997 Optical condensation measurement in gas turbine engine inlets

Jason Potter, Ralph P. Tatam

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.279751
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A non-intrusive optical system for the measurement of air inlet condensation in gas turbine engines is presented. The system uses a technique in which a linear relationship between the liquid water content (LWC) and the optical extinction coefficient exists. The extinction coefficient was determined by measuring the extinction of a 10.6 micrometers CO₂ laser beam due to Mie scattering from water droplets and the LWC calculated from the linear relationship. Results of the extinction coefficient determined with the system used in a single transmission path mode on a condensing flow occurring in the inlet of a subsonic suction tunnel are presented together with the temperature rise of the ambient air calculated from the extinction coefficient. A rise of 8.65 degrees K was obtained at 0.65. Mach, for an ambient temperature of 20 degrees C and relative humidity 49 percent, which is consistent with previous non-optical measurements.

Citation Download Citation

Jason Potter and Ralph P. Tatam "Optical condensation measurement in gas turbine engine inlets", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.279751

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