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Combustion of premixed mixture in a constant volume channel generates high and low frequency pressure oscillations and these waves interact with the flame front. A laser-based optical measurement technique is used to capture the flame propagation and the thermo-acoustic phenomena in a straight constant volume channel. Simultaneous measurements with photo detectors and high-speed imaging are used to accurately capture the flame front and the pressure oscillations. High and low frequency acoustic oscillations are observed at different stages of the flame propagation. The flame front is captured accurately with \(<3\%\) error. An attempt is made to measure the flame thickness with the present technique and it is found that lowest flame thickness is observed at equivalence ratio of 1–1.1.

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Optical Measurement Technique for Thermo-acoustic Pressure Detection in a Combustion Chamber

  • 会议论文

  • 发表日期：

    2025年

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  • Siba Prasad Choudhury,
  • S. Syam,
  • Ratan Joarder

摘要

Combustion of premixed mixture in a constant volume channel generates high and low frequency pressure oscillations and these waves interact with the flame front. A laser-based optical measurement technique is used to capture the flame propagation and the thermo-acoustic phenomena in a straight constant volume channel. Simultaneous measurements with photo detectors and high-speed imaging are used to accurately capture the flame front and the pressure oscillations. High and low frequency acoustic oscillations are observed at different stages of the flame propagation. The flame front is captured accurately with \(<3\%\) error. An attempt is made to measure the flame thickness with the present technique and it is found that lowest flame thickness is observed at equivalence ratio of 1–1.1.