旋回噴流燃焼器を用いた強乱流予混合火炎の研究 : 第3報,Slot-Correlation法による燃焼場の乱れスケールの計測(熱工学,内燃機関,動力など)

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Premixed flames in highly turbulent flow have been investigated by a cyclone-jet combustor. The velocity field has been measured using LDV (laser-doppler velocimeter) to analyze the experimental conditions on the combustion diagram. Especially, the requirement for determination of turbulence scale has been examined. In conventional data-sampling, the interpolated velocity data does include errors so that the auto-correlation coefficient is higher, resulting in the larger integral time scale of turbulence. Slot-Correlation method is useful to examine the velocity fluctuation based on randomly sampled data by LDV. For determining integral time scale, the data number of the order of 10^5 is needed within 10% error. The flow field is changed by combustion and the turbulence is reduced, with the turbulence scale smaller. On the combustion diagram, the condition of U_m<15 m/s belongs to the flamelet regime, and that of U_m>20 m/s belongs to the distributed reaction zone regime.
2002-02-25