Abstract
The purpose of this study is to investigate the characteristic of the thrust for the propulsive nozzle driven by the high-pressure air compressed by the self-excited vibration in the blower piping system. In order to increase the performance, two valves were arranged in the piping system. 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 two valves, and the water depth. The following conclusions were obtained. The peak of thrust for the nozzle with valve moved to the side of the deep depth. In the range of the present experiment the value of the thrust increased in comparison with that of original nozzle without valve. The finite difference lattice Boltzmann method is helpful to investigate the characteristics of the flow in the nozzle.
