Abstract

This paper presents the development and application of a broadband ultrafast-laser-absorption-spectroscopy (ULAS) technique operating in the mid-infrared for simultaneous measurements of temperature, methane (${{\rm CH}_4}$), and propane (${{\rm C}_3}{{\rm H}_8}$) mole fractions. Single-shot measurements targeting the C-H stretch fundamental vibration bands of ${{\rm CH}_4}$ and ${{\rm C}_3}{{\rm H}_8}$ near 3.3 µm were acquired in both a heated gas cell up to ${\approx} 650\;{\rm K}$ and laminar diffusion flames at 5 kHz. The average temperature error is 0.6%. The average species mole fraction errors are 5.4% for ${{\rm CH}_4}$ and 9.9% for ${{\rm C}_3}{{\rm H}_8}$. This demonstrates that ULAS is capable of providing high-fidelity hydrocarbon-based thermometry and simultaneous measurements of both large and small hydrocarbons in combustion gases.

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