C141 圧力勾配下にある乱流拡散火炎の温度場時空間構造(C-14 乱流熱物質移動および反応流(2),一般講演)

概要

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Spatio-temporal structures of the thermal field of a non-premixed turbulent flame formed in a curved rectangular duct were investigated experimentally. The flame was much affected by a strong pressure-gradient in the radial direction of the duct curvature, which caused strong gradient diffusion in turbulent heat transfer at the inner-wall side of the flame and, on the contrary, counter-gradient heat transfer at the outer-wall side. Two-point correlation measurement of temperature fields revealed that, in the strong gradient diffusion region, a spatial thermal pattern generated by turbulent mixing of high- and low-temperature fluid parcels was advected downstream with little diffusion. In contrast, the pattern was attenuated and diffused rapidly in the counter-gradient diffusion region. These results accurately correspond to the generation mechanism of the counter-gradient heat transport so far observed in stably stratified turbulent flows.
日本流体力学会の論文
2004-08-09