軸対称乱流噴流中の速度およびスカラー量の同時測定 : 第2報, 速度とスカラー量のスペクトルおよび相関の構造

抄録

The axial velocity and concentration of a high Schmidt number matter were measured simultaneously in an axisymmetric turbulent jet. The diffusing fluid is a water solution of the commercial dye (Schmidt number S_c≃3800), and an issuing Reynolds number is 6300. A combined probe of a fiber optic concentration sensor and a sigle hot film was used to measure the axial velocity and the concentration simultaneously. The axial velocity and concentration power spectra show the log-normality in the scale region smaller than the integral scale of velocity. The decreases of the correlations of the axial velocity and the concentration are observed in the same region as the power region of the velocity spectra. And they have almost no correlation in the scale region smaller than that region.