Ship screw propeller; has blades arranged on inside of outer ring, with continuously increasing blade angle from outside to inside and forms bell-shaped flow speed profile

摘要

The screw propeller has blades arranged on the inside of an outer ring. The flow speed profile formed by the propeller is bell-shaped. The angle of the blades increases continuously from the outside to the inside. A drive shaft is arranged outside the propeller. Air is blown in through an outer bearing shell.