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

Hironobu Ueki; Masahiro Ishida; Daisaku Sakaguchi

doi:10.1117/12.279746

21 November 1997 Measurement of temperature and velocity fluctuations in a turbulent diffusion flame by an optical fiber thermometer and a laser 2-focus velocimeter

Hironobu Ueki, Masahiro Ishida, Daisaku Sakaguchi

Author Affiliations +

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.279746
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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 and the optical fiber thermometer and the optical fiber thermometer respectively. The flame temperature and the soot particle density were calculated by applying the IR 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.

Citation Download Citation

Hironobu Ueki, Masahiro Ishida, and Daisaku Sakaguchi "Measurement of temperature and velocity fluctuations in a turbulent diffusion flame by an optical fiber thermometer and a laser 2-focus velocimeter", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.279746

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