Advanced Combustion Diagnostics：From Flame Structure to Emission Characterization

Dear Colleagues,

The Special Issue “Advanced Combustion Diagnostics：From Flame Structure to Emission Characterization” focuses on the latest experimental and computational advances that deepen our understanding of the complex interactions between flame structure, combustion chemistry, and pollutant formation. As the demand for high-efficiency and low-emission combustion technologies continues to grow, sophisticated diagnostic methods are essential for resolving the multiscale physical and chemical processes governing fuel conversion, heat release, and the generation of emissions such as soot, polycyclic aromatic hydrocarbons (PAHs), and unburned hydrocarbons.

This Special Issue aims to bridge fundamental flame research with applied combustion engineering by providing a platform for innovative in situ and ex situ diagnostic techniques as well as high-fidelity modeling approaches. We welcome original research articles, reviews, and technical notes on topics including, but not limited to:

• laser-based and optical diagnostics (e.g., multispectral imaging, light-field imaging, LIF, CARS, absorption spectroscopy);
• multidimensional reconstruction of temperature, and species concentration;
• chemical effects of fuel components such as natural gas constituents, CO₂ dilution, and hydrogen enrichment on emissions;
• characterization of inverse and non-premixed flame structures;
• simultaneous retrieval of soot temperature and volume fraction in participating media;
• uncertainty quantification in optical measurements;
• integrated experimental–numerical methodologies for model validation;
• machine learning-assisted analysis of combustion data;
• diagnostic developments for practical combustors, engines, and gas turbines.

By assembling cutting-edge research in these areas, this Special Issue seeks to promote the advancement and practical application of next-generation combustion diagnostic technologies. 

Dr. Tianjiao Li
Dr. Weijie Yan
Guest Editors

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