高圧下におけるメタン-酸素同軸乱流非予混合火炎の流動場計測(オーガナイズドセッション6 乱流燃焼研究の最前線)

抄録

We carried out the flow field measurement of methane-oxygen turbulent nonpremixed flame in noncombusting and combusting situations under high pressure using LDV. Direct observation and CH^* chemiluminescence measurement are conducted in high pressure up to 1.0MPa. It was found that the flame length at elevated pressure became constant. From flow field measurements, the following features of the flame at elevated pressure were found : (1) the existence of the flame suppresses turbulence in the upstream region of the jet flow and enhances it in the downstream region with increasing pressure ; (2) Turbulence in the flame is more anisotropic than in the corresponding cold jet in all regions of the flow with increasing pressure ; (3) Reynolds shear stress was not changed at elevated pressure ; (4) The combustion process has been found to have a marked influence on the turbulence integral scale under high pressure, however, even increasing pressure, turbulence integral scale was not changed.