Spatially resolved infrared spectra of F109 turbofan exhaust

Jacob L. Harley; August J. Rolling; Charles F. Wisniewski; Kevin C. Gross

doi:10.1117/12.920630

18 May 2012 Spatially resolved infrared spectra of F109 turbofan exhaust

Jacob L. Harley, August J. Rolling, Charles F. Wisniewski, Kevin C. Gross

Proceedings Volume 8354, Thermosense: Thermal Infrared Applications XXXIV; 83540H (2012) https://doi.org/10.1117/12.920630
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

There is a strong interest in diagnosing engine performance problems and maintenance needs using optical techniques instead of expensive, time-consuming mechanical inspection. A Telops Hyper-Cam MWIR imaging Fourier-transform spectrometer collected spectrally-resolved images of jet exhaust from an F109 turbofan engine operating at 53%, 82%, and 88% of maximum RPM. This work attempts to discern what information content about the turbulent jet flow field is revealed in the measured spectra. The spectrum is examined and simulated, a radial and axial temperature mapping of the plume is presented, and a turbulent temporal and spatial analysis method is demonstrated. Spectral simulation of a pixel centered at nozzle exit finds volume mixing fractions of 3.3% H₂O and 2.8% CO₂ and an exhaust temperature of 560K with the engine at 82%. A single, high frequency turbulent feature is mapped and tracked over several frames. Velocity of this feature, based on the 2.86kHz camera frame rate and 0.067cm² per pixel spatial resolution, is approximately 176^m/s and compares favorably with an estimate based on the measured mass flow rate. This effort is a proof of concept and intended to justify qualitative analysis of a more controlled and characterized turbulent source in future work.

Citation Download Citation

Jacob L. Harley, August J. Rolling, Charles F. Wisniewski, and Kevin C. Gross "Spatially resolved infrared spectra of F109 turbofan exhaust", Proc. SPIE 8354, Thermosense: Thermal Infrared Applications XXXIV, 83540H (18 May 2012); https://doi.org/10.1117/12.920630

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