反応性乱流拡散場における速度と濃度の結合統計量

概要

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Joint statistics between streamwise velocity and concentration of reactive species in a planar liquid jet with a secondorder chemical reaction (A×B→R) are experimentally investigated. A water solution of species A is issued into a main stream containing species B. In this study, velocity and concentration are simultaneously measured by combining I-type hot-film anemometry with an optical fiber probe based on light absorption spectrometry, and we investigate correlation coefficients, joint probability density functions, and cospectra between velocity and concentration. The results show that the chemical reaction makes the absolute value of a correlation coefficient between u and γB small whereas a correlation coefficient between u and γA becomes large on the jet centerline owing to the chemical reaction, where u is the streamwise velocity fluctuation and γi (i = A, B, R) is the concentration fluctuation of species i. The correlation coefficient between u and γR has a negative value in the upstream region and has a positive value in the downstream region and the outer edge of the flow. It is also shown that the influence of the chemical reaction on the cospectrum of u and γi in the upstream region and near the jet centerline is different from that in the downstream region and the outer edge of the flow.