レーレー散乱とLDVを組合せた乱流拡散火炎の温度と速度の同時測定

抄録

The characteristic quantities of turbulent diffusion flames are simultaneously measured by Rayleigh scattering and the LDV system. The co-axial turbulent diffusion flames formed by the mixed fuel of 62.2% H₂+37.8 % CH₄ and air, in which the Rayleigh scattering cross sectional area changes within 5% by combustion, are ;measured. The temperature and velocity characteristics obtained from one thousand simultaneous data pairs of temperature, and the velocity obtained by permitting a time difference of 102 μs between these two signals because of the masking of the Rayleigh signal by the Mie scattering from thee particles introduced for LDV measurement, almost agree with the values calculated from ten thousand pieces of data obtained from independent measurements. The typical probability density functions of temperature and velocity for the turbulent diffusion flames are obtained. The distribution of <v'T'>^^- could not be predicted by the simple turbulent flame theories.