Abstract
The paper presents fine-wire thermocouple measurements of temperature and temperature fluctuations in a confined, two-dimensional, premixed methane-air flame of 0.8 equivalence ratio, stabilised by a backward-facing step, and with bulk flow Reynolds numbers ranging from 2800 to 13000. The results indicate a narrowing of the flame front with decrease in Reynolds number. The temperature fluctuation measurements were compensated for thermal inertia and the probability density functions were bimodal with the probability density at the two extremes of the temperature range increasing with fall in Reynolds number. Temperature power spectra indicated that the preferred frequencies corresponded to the acoustic frequencies of the combustor system, although the influence of vortex shedding was evident at the lowest Reynolds number.
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Sivasegaram, S., Whitelaw, J.H. Temperature characteristics of turbulent, premixed flames stabilised on a step. Experiments in Fluids 1, 161–165 (1983). https://doi.org/10.1007/BF00272015
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DOI: https://doi.org/10.1007/BF00272015