Abstract

A novel method is presented for quantitative two-dimensional temperature measurement in combustion gases. This method, namely spectrally resolved planar laser-induced fluorescence thermometry, utilizes a high-power, wavelength-tunable and narrow-linewidth CW laser to access the spectral lineshapes of a key combustion intermediate, the hydroxyl radical (OH), and enables high-fidelity and calibration-free quantification of non-uniform temperature fields in complex reacting flows. Specifically, the ${\mathrm{R}}_1(11)/{\mathrm{R}}_1(7)$ line pair of the OH ${\mathrm{A}}^2{\mathrm{\Sigma }}^{+}-{\mathrm{X}}^2\mathrm{\Pi }(0,0)$ rovibronic band was probed with laser radiation near 306.5 nm, and their fluorescence ratios were used to infer temperature. Preliminary demonstrations of this thermometry method were performed in a series of burner-stabilized ${\mathrm{CH}}_4$-air flames.

© 2019 Optical Society of America

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