Abstract
The purpose of this study is to investigate the characteristic of the thrust for the propulsive nozzle directly driven by the high-pressure air compressed by the self-excited vibration in the blower piping system. The exhaust valve is positioned at the discharge pipe, and both the pressure and the thrust were measured for various parameters such as the number of revolution for the blower, the period of the opening and closing action of the valve, and the depth. The following conclusions were obtained. The dominant frequency agrees with the period of the opening and closing action of the valve. It is important for the rise of the ejection pressure to coincide the period of the wave for the gas-liquid interface and one of the opening and closing action of the exhaust valve.
