Investigation of Hydrogen and Ammonia Auto-ignition in A Shock Tube through Optical Imaging
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Yao, Huaidong
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Abstract
This thesis presents a comprehensive study on the auto-ignition characteristics of hydrogen and ammonia mixtures in a high-pressure shock tube using advanced optical imaging diagnostics. Motivated by the discrepancies observed between experimental and theoretical ignition delay times (IDTs), this work addresses the limitations of conventional diagnostic methods by implementing both endwall and sidewall imaging systems. Utilizing high-speed OH* chemiluminescence imaging and pressure-based diagnostics, this study reveals significant insights into ignition homogeneity and axial ignition locations. For the first time at Georgia Tech, endwall and sidewall imaging was employed in a circular cross-section shock tube, enhancing the spatial resolution and diagnostic accuracy. Experimental IDTs for various H₂/O₂/Ar and NH₃/O₂/Ar mixtures were compared against predictions from detailed kinetic models. The findings underscore the critical need for spatially resolved diagnostics in shock tube combustion research and contribute to the development of more accurate chemical kinetic mechanisms for clean energy fuels.
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2025-04-30
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