FTIR emission spectroscopy and modeling of radiative transfer through a layered plume: analysis of aircraft engine exhausts

Joerg Heland; Klaus Schaefer; Rainer Haus

doi:10.1117/12.205551

10 February 1995 FTIR emission spectroscopy and modeling of radiative transfer through a layered plume: analysis of aircraft engine exhausts

Joerg Heland, Klaus Schaefer, Rainer Haus

Author Affiliations +

Proceedings Volume 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements; (1995) https://doi.org/10.1117/12.205551
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

FTIR-emission spectroscopy detects the thermal radiation of hot exhaust gases, yielding all information about its compounds during one measurement. Apart from the interpretation of smoke stack measurements, FTIR-emission spectroscopy as a remote sensing technique was further developed for analyzing layered plumes, especially aircraft engine exhausts in a program of the German Science Foundation (DFG) on the effect of air traffic on the environment. The measurements shall be used as input data for model calculations and to validate the extrapolated emission data at flight altitude. The evaluation of the spectra with respect to the gas composition contains a line-by-line calculation of the transmittances of several layers of the exhaust plume (temperature- and concentration-gradients) followed by the radiative transfer through the medium towards the detector. The spectral input data are taken from the HITRAN 92 database. After the spectroscopic determination of the plume temperature and its profile from the CO₂-band around 2400 cm^-1, one obtains the total mass of the single gas species in the field of view of the spectrometer. Comparing the measured data for CO₂ with the theoretical emission index from ideal stoichiometric combustion, one obtains the emission indices for the other measured species. Knowing the fuel consumption of the engine, one gets the emission rates of the compounds in g/s. Apart from future applications for the turbine development and the engine-status control after a certain flight time, this remote sensing system can deliver emission data of aircraft engines and the temperature decay of the exhaust plumes at all altitudes.

Citation Download Citation

Joerg Heland, Klaus Schaefer, and Rainer Haus "FTIR emission spectroscopy and modeling of radiative transfer through a layered plume: analysis of aircraft engine exhausts", Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); https://doi.org/10.1117/12.205551

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