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Experimental Investigation of Turbulence-Chemistry Interaction in High-Reynolds-Number Turbulent Partially Premixed Flames

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Technical Report,30 Sep 2014,29 Mar 2016

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Clemson University, Department of Mechanical Engineering Clemson United States

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The project focused on implementing the photo dissociation-based method for simultaneous two-dimensional imaging of mixture fraction and temperature in turbulent non-premixedpartially premixed flames. Mixture fraction is an important variable in understanding and modeling turbulent mixing and turbulence-chemistry interaction, two key processes in such flames. Previous techniques are limited by one or more factors including the assumption of simplified flame chemistry, the use of non-inert tracer species, and the use of Raman scattering, thereby incapable of providing two-dimensional mixture fraction imaging in flames. Recently, a new method based on photo dissociation of iodine containing species, two-photon laser-induced fluorescence LIF of atomic iodine, and Rayleigh scattering was developed by the PI and colleagues at Clemson University, enabling accurate simultaneous two-dimensional imaging in turbulent flames for the first time. The research activities focused on the technical issues in implementing the method, including achieving accurate iodine seeding level, eliminating the interference from LIF of molecular iodine excited at 532 nm and from OH excited at 298 nm, and determination of the system response. Two-dimensional imaging was performed in laminar and turbulent partially premixed methane flames to demonstrate the capability of the new measurement system.

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