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Experimental Studies of Premixed Flame Structure and Propagation Characteristics in Compressible Flow

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Technical Report,01 Apr 2012,01 Jun 2015

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Georgia Institute of Technology Atlanta United States

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Understanding the nature of premixed combustion in highly turbulent conditions and in compressible flow offers a new paradigm shift in the design of future high-pressure gas turbines and scramjets. Experimental data in these regimes provides hitherto unavailable insight and offer new ways to develop accurate and efficient computational models of turbulent premixed combustion, especially subgrid-scale SGS models for large-eddy simulation LES. In these studies, comprehensive experimental efforts were performed to study turbulent premixed combustion in a configuration that deliberately avoided mean strain effects and focused solely on the integration of premixed flame in high Reynolds number, isotropic turbulence over a range of Mach numbers. Two experiments were developed to create this uniform premixed flow with upstream active turbulence generation in the subsonic and supersonic regimes. Turbulent statistics are reported for a variety of conditions using hotwire anemometry and PIV. Flame kernels were generated via laser plasma ignition, and their growth monitored using chemiluminescence, Schlieren, and PLIF imaging. Flame growth statistics show good agreement with classical flame bomb studies in low speeds but deviate with increasing Mach number.

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