二次元乱流噴流における線形撹乱の乱流統計量について(境界層・せん断流・遷移(3),一般講演)

概要

論文の詳細を見る
A two-dimensional turbulent jet has a global disturbance of so-called fluttering, which is the lateral irregular vibration of the high-speed jet core. The streamwise and lateral velocity fluctuations are measured with an anemometer and an x-type probe, and are filtered using an ensemble average technique based on the periodic initial disturbance. The experimental result at relatively low initial disturbance shows that the streamwise envelope of fluttering disturbance mode is constant if the velocity fluctuation is normalized by the initial disturbance intensity, suggesting the mode has linear property. The velocity disturbance equations with applying the three-component decomposition on the velocity signals into a time mean, the periodical ensemble average and random fluctuations, also demonstrates existence of such linear disturbance in turbulence if the ensemble correlations of the random components are proportional to the mode amplitude or negligible.
日本流体力学会の論文
2010-09-09