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In this paper, the propulsion performance of a nozzle for a ship directly driven by ejecting a high-pressure gas was investigated about the characteristics of the velocity of the surrounding water, the shape of the nozzle and the frequency of the high pressure gas ejection. In the combustion frequencies 2-4 Hz, the thrust of the nozzle was smaller but the specific impulse was higher than the higher frequencies in each surrounding velocity. Even if the surrounding velocity increased, the thrusts of each combustion frequency in the rear wall angle 15 degrees of the nozzle were almost same. However, the thrusts in the angle 30 degrees became small by increasing the surrounding velocity. The gas-water unsteady flow in the nozzle was also clarified by the observation with a high speed video camera.

Performance of a Nozzle for a Ship Ejecting High Pressure Gas Periodically in Various Water Velocities