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Thermophysics and Aeromechanics

2004 year, number 4

Experimental investigation of premixed acetylene flame

V.V. Bakic, S.N. Oka, and N.D. Crnomarkovic
Institute of Nuclear Sciences "Vinca", Belgrade, Serbia and Montenegro
Pages: 537-548

Abstract

Entrainment of surrounding air into premixed acetylene flame leads to a change in velocity and temperature fields. In this paper the mixing process between the premixed acetylene flame and surrounding air, in different regions of the flame, for different air/acetylene ratios has been analyzed. Conditional and unconditional statistics of the LDA signals were performed using jet and/or air seed. Compared to commonly used unconditional statistics, conditional statistics of velocity fluctuations can give us more data about intensity of turbulent mixing in the flame. Mean velocity, turbulence intensity, and probability density function of instantaneous velocities have been measured in different cross sections of the flame, for premixed acetylene/air mixture with different air/acetylene ratios. The velocity field measurements were performed with the laser-Doppler anemometer, while for the temperature field measurements Pt-PtRhl0 % thermocouple was used. Relations between mean velocities and probability density functions have been established in cases of conditional and unconditional seeding. Mixing factor has been defined as a measure of mixing intensity. By comparative analysis of the obtained mean velocity and temperature profiles, the length and width of characteristic regions of the premixed acetylene flame and their characteristic properties were established for different fuel-air ratios.