A e ber‐ optic probe has been developed for spatially and temporally resolved measurements of the equivalence ratio in actual gas-turbine combustors. The measurement is based on laser-induced e uorescence, where acetone is used as a e uorescence seed. The effects of acetone concentration, temperature, and pressure on the e uorescence signal have been characterized in a steady e ow test cell at temperatures (up to 400&C) and pressures (up to 12 atm) representative of real-gas-turbine combustors. The capabilities of the e ber-optic probe have been demonstrated by making measurements in a turbulent axisymmetric airjet. Under typical measurement conditions it has been shown that the mean and rms e uctuation of the equivalence ratio can be determined with an accuracy of better than 65%.
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Lee et al. (1997) studied this question.
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