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RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Gas Turbine Exhaust Emissions Monitoring Using Nonintrusive Infrared Spectroscopy

[+] Author and Article Information
M. Hilton, A. H. Lettington

J. J. Thomson Physical Laboratory, University of Reading, Whiteknights, P.O. Box 220, Reading, RG6 6AF, United Kingdom

C. W. Wilson

Defence Research Agency, Pyestock, Farnborough, GU14 OLS, United Kingdom

J. Eng. Gas Turbines Power 120(3), 514-518 (Jul 01, 1998) (5 pages) doi:10.1115/1.2818175 History: Received March 07, 1997; Online November 19, 2007

Abstract

Infrared (IR) spectra of the exhaust emissions from a static gas turbine engine have been studied using Fourier Transform (FT) spectroscopic techniques. Passive detection of the infrared emission from remote (range ∼ 3 m) hot exhaust gases was obtained nonintrusively using a high spectral resolution (0.25 cm−1 ) FTIR spectrometer. Remote gas temperatures were determined from their emission spectra using the total radiant flux method or by analysis of rotational line structure. The HITRAN database of atmospheric species was used to model the emission from gas mixtures at the relevant temperatures. The spatial distribution of molecular species across a section transverse to the exhaust plume ∼10 cm downstream of the jet pipe nozzle was studied using a tomographic reconstruction procedure. Spectra of the infrared emission from the plume were taken along a number of transverse lines of sight from the centerline of the engine outwards. A mathematical matrix inversion technique was applied to reconstruct the molecular concentrations of CO and CO2 in concentric regions about the centerline. Quantitative measurement of the molecular species concentrations determined nonintrusively were compared with results from conventional extractive sampling techniques.

Copyright © 1998 by The American Society of Mechanical Engineers
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