The motivation behind this project stems from the need to understand the limitations of shock tube experiments, particularly the occurrence of non-ideal ignition events. By capturing these ignition modes in real time, the project aims to improve the reliability of data used for validating chemical kinetic models.

^{Optical end section for simultaneous lateral and endwall visualization}

The project leverages a shock tubes equipped with an optical section that allows for dual-camera imaging.
The system captures images at 50,000 frames per second, revealing ignition characteristics of alternative fuels such as ethanol and methanol, along with paraffinic fuels like n-hexane. The research identified key differences in how these fuels ignite, particularly in localized ignition events. This setup provides a robust framework for analyzing fuel mixtures that exhibit negative temperature coefficient (NTC) behavior and preignition, helping refine chemical kinetic models.

^{Simultaneous endwall and sidewall imaging of ethanol mixture E at 1012 K and 2.4 bar and methanol mixture A at 1026 K and 1.5 bar.}

Impacts:

• Improved Combustion Models: The research provides critical data to refine chemical kinetic models, especially for fuels that are prone to non-homogeneous ignition.
• Enhanced Understanding of Preignition: The work sheds light on preignition phenomena, which is crucial for the design of advanced combustion systems such as internal combustion engines and gas turbines.
• Industrial Relevance: The findings have direct applications in industries like automotive and aerospace, helping to optimize combustion processes for cleaner and more efficient energy production.