Determination of exhaust composition in turbine test beds by FTIR emission spectrometry

Klaus Schaefer; Joerg Heland; Erwin Lindermeir; Moira Hilton; Gary Bishop; Johanna Vally; Peter Wiesen; Dave H. Lister; Marc Bernard

doi:10.1117/12.364180

16 September 1999 Determination of exhaust composition in turbine test beds by FTIR emission spectrometry

Klaus Schaefer, Joerg Heland, Erwin Lindermeir, Moira Hilton, Gary Bishop, Johanna Vally, Peter Wiesen, Dave H. Lister, Marc Bernard

Author Affiliations +

Proceedings Volume 3821, Environmental Sensing and Applications; (1999) https://doi.org/10.1117/12.364180
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

A modified mid-size low by-pass aero-engine running on a sea level test bed was used for measurements with non-intrusive demonstrator systems and currently used gas sampling analysis techniques. A novel open-path White mirror system was developed and installed in the test bed to enhance the sensitivity of non-intrusive FTIR spectrometry. A comparison was made of the different measurement techniques at several engine thrust levels i.e. gas concentrations. This included the emission and absorption mode of the FTIR-spectrometers with the multi-path reflection compartment as well as the single emission mode. A new calibration procedure with a hot cell filled with CO (temperatures 300 to 750 K) was developed and used to calibrate the FTIR instruments. Retrieval results from FTIR measurements were obtained by using a rectangular and Gaussian distribution profile of temperature and gas concentrations in the plume. The FTIR measurement results for CO₂, CO, and NO have been proven to be in agreement with the intrusive data. The deviations were generally in the order of plus or minus 30%, i.e. comparable to the day-to-day variations of the engine emissions. NO₂ could be detected in the absorption mode only.

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Klaus Schaefer, Joerg Heland, Erwin Lindermeir, Moira Hilton, Gary Bishop, Johanna Vally, Peter Wiesen, Dave H. Lister, and Marc Bernard "Determination of exhaust composition in turbine test beds by FTIR emission spectrometry", Proc. SPIE 3821, Environmental Sensing and Applications, (16 September 1999); https://doi.org/10.1117/12.364180

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