Suppression Characteristics of Sloshing in a Recutangular Vessel by a Bulkhead.

Abstract

This paper deals with suppression characteristics of sloshing in a rectangular vessel by a bulkhead which divides the vessel vertically into two sections. The sloshing mode is separated into two modes by the bulkhead ; the one is the sloshing mode of liquid column in a U-tube, and the other is the sloshing mode in the separated tank. The effect of aperture height of the bulkhead and exciting amplitude on the suppression characteristics of U-tube mode sloshing is examined experimentally. And the flow patterns of the fluid In the vessel are visualized. As a result, following phenomena are clarified. (1) There are three types of flow pattern. The one is the flow pattern (A) with unsteady vortexes, and another is the flow pattern (B) with single swirl and a vortex, and the other is the flow pattern (C) with twin swirls. (2) The flow pattern changes from pattern (A) to (B) or (O with increasing the exciting amplitude. (3) The damping ratio of the sloshing with the bulkhead is much larger than that without the bulkhead. (4) The damping produced by the bulkhead is dependent on the exciting amplitude and it's damping ratio increases with increasing the exciting amplitude. (5) The flow pattern plays an important role for dissipation of the energy of the sloshing. In particular, the vortexes and swirls increase the energy dissipation of the sloshing.