Design and Initial Optical Characterization of a Lean, Premixed, Prevaporized Combustor
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Budzinski, Steven Matthew
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Abstract
One of the challenges for wider acceptance of civil supersonic transportation (CST) is the environmental impacts of a CST fleet, especially as stricter emissions requirements are being developed. Current research utilizing a low-emissions Lean Premixed Prevaporized (LPP) concept combustor shows promising results for potential use in a larger CST engine. However, the validation of combustor stability and emissions metrics are still needed in order to properly model the combustor. This work presents the design and construction of a LPP concept combustor including components for the injector, liner, water-cooled exhaust, choke plate, and exhaust probe. After assembly, preliminary characterization of the LPP combustor is completed using digital inline holography (DIH), fuel planar laser induced fluorescence (PLIF), and OH* chemiluminescence. Due to fuel injection bias noted during the first campaign, significant effort is made to characterize the spray generated by the premixer. Here, DIH and phase Doppler particle analysis (PDPA) are compared quantitatively for the first time and used to characterize the spray as the axial injection locations, injection locations, and momentum flux ratios are varied.
By presenting initial characterization results for this combustor, data is acquired to support future design improvements for the LPP concept combustor. Overall, this experiment aims to improve modeling of the LPP combustion process for future supersonic transportation applications.
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2024-04-29
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