In this work we will discuss the use of the laser-induced gas breakdown for stabilizing and measuring the fuel-to-air ratio of a turbulent jet diffusion flame. The gas breakdown was produced using a single-mode, Q-switched Nd-YAG laser which produced a 0.6-cm-diameter beam at a wavelength of 1064 nm with a 5.5 ns pulse duration. The jet flow rates ranging from 35 cm3/s (Re = 1086) to 103 cm3/s (Re = 3197) were used. The relative amounts of fuel and air concentrations at the laser focus were estimated using the late time behavior of the line radiation at the wavelength of the OI triplet near 777 nm and at the wavelength of the Hα line, 656 nm, which is emitted by electronically excited hydrogen dissociated from the methane fuel.

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