Measurement of temperature and velocity fluctuations in a turbulent diffusion flame by optical fiber thermometer and laser 2-focus velocimeter

Hironobu Ueki, Masahiro Ishida, Daisaku Sakaguchi

Research output: Contribution to journalConference articlepeer-review

12 Citations (Scopus)

Abstract

Both fluctuations of local velocity and local temperature were measured in a steady turbulent diffusion flame of propane by using the semiconductor laser 2-focus velocimeter (L2F) and the optical fiber thermometer (OFT) respectively. The flame temperature and the soot particle density were calculated by applying the infrared two-color method to the measured radiant energy from the soot particles in the flame. In the analysis of the frequency power spectra of temperature and velocity fluctuations, the correlation-based slotting technique was adopted for those data with the nonuniform time interval. It is shown that the time mean value and the fluctuation of the flame temperature decrease gradually toward downstream in the luminous flame region, and those of the soot density increase due to decay of turbulence along the flame axis. On the other hand, both time mean and fluctuation of the flame temperature increase in the radial direction from the center to the periphery due to the effect of air entrainment marked in the peripheral region of the flame. Furthermore, the power spectrum of the velocity fluctuation is not always the same as that of the temperature fluctuation in the flame center.

Original languageEnglish
Pages (from-to)362-371
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3172
DOIs
Publication statusPublished - 1997
Externally publishedYes
EventOptical Technology in Fluid, Thermal, and Combustion Flow III - San Diego, CA, United States
Duration: Jul 28 1997Jul 28 1997

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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