ボイラ管群で発生する空力自励音のバッフル板による対策メカニズムに関する研究

概要

論文の詳細を見る
The insertion of baffle plates in a duct is one of some countermeasures of the self-sustained tone generated from the duct with two tube banks. However the use of the baffle plate in the tube banks with cavity has unclear points in the baffle plate length and the insertion conditions. Then the aim of this study is to establish the best insertion condition of the baffle plate in the tube banks with the cavity. And the new idea has been verified by experiments that the suppression mechanism of the self-sustained tone is due to the decrease of the particle velocity and the Karman vortex. In the present experiments, the suppression effect of the baffle plate on the self-sustained tone has been examined. As a result, it was clarified that two peaks of fluctuation velocities appeared when the self-sustained tone occurred and one of them, which has a steep peak, was due to the occurrence of the self-sustained tone. It was also clarified that the self-sustained tone was occurred also by the selected resonance.