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ISSN Печать: 2150-766X
ISSN Онлайн: 2150-7678
Indexed in
ACOUSTIC EMISSION MEASUREMENTS FOR CHARACTERIZING HYDROCARBON/OXYGEN DIFFUSION FLAME BEHAVIOR
Краткое описание
An investigation was performed to characterize the behavior of a hydrocarbon/oxygen diffusion flame by acoustic emission measurements. Experiments were performed in a horizontally mounted, 2-D axisymmetric stainless steel chamber with a single shear coaxial injector and an adjustable graphite nozzle at the chamber exit for maintaining a constant chamber pressure. Methane gas flowed through the annular injector port while oxygen exited the center port. Ignition of the diffusion flame was achieved by a C2H6/O2 torch. Four acoustic transducers placed circumferentially around the diffusion flame at various locations were used in combination with a Pyrex viewing window to observe and classify the diffusion flame as either an anchored flame to the injector, a detached flame with small amplitudes of oscillation, or a near-blowout flame with large amplitudes of oscillation. Results showed that there was a noticeable difference in diffusion flame acoustic emission spectra based on flame stability behavior. Anchored diffusion flames showed no significant trace of acoustic emission at fuel flow rates below 0.65 g/s. Stable, small oscillating detached flames showed minimal amplitude acoustic levels, whereas near-blowout diffusion flames covered a wide range of acoustic frequencies. As the diffusion flame exhibited greater instability behavior, more frequency hits (a measure of the number of times an acoustic signal exceeded a preset threshold) at higher amplitudes were generated until eventual flame blowout occurred. Any increase in the (O/F)mass resulted in an increase in acoustic frequency amplitude and absolute energy. Narrower frequency ranges at higher amplitude values also accompanied this increase in (O/F)mass.
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Eckenrode Lucas, Ianuzzi Makayla, Litzinger Morgan, Nunamaker Lucas, Crist Jordan, Moore Jeffrey D., Risha Grant A., Design, Fabrication, and Testing of a Non-Premixed Methane/Oxygen Diffusion Flame Burner, AIAA Propulsion and Energy 2019 Forum, 2019. Crossref
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Ianuzzi Makayla L., Hollingshead Joshua M., Moore Jeffrey D., Risha Grant A., Effect of Impingement Angle on Flame Stability in a Non-Premixed Methane/Oxygen Diffusion Flame Burner, AIAA Propulsion and Energy 2020 Forum, 2020. Crossref
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Ianuzzi Makayla L., Hollingshead Joshua, Moore Jeffrey D., Risha Grant A., Varying Secondary Flow Area in a Single Coaxial Injector for a Methane/Oxygen Diffusion Flame Burner, AIAA Propulsion and Energy 2021 Forum, 2021. Crossref
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Ianuzzi M. L. L., Eckenrode L. M., Curfman C. S., Moore J. D., Risha G. A., Effect of Flow Parameters and Injection Flow Area on Non-Premixed Methane/Oxygen Diffusion Flame Stability, Combustion Science and Technology, 194, 3, 2022. Crossref