Academic Research On Forming Steady Air Pocket In Large Scale Multi-grooves Of Air Bubble Ship

People begin to research resistance reduction of ship by putting air to the bottom of ships from 18th century. Air pocket resistance reduction is known as an easy and effective method generally. Forming steady air pocket is the key technology of air pocket resistance reduction, so it is necessary to design reasonable grooves for forming steady air pocket. This thesis does more research to design large groove inner structure basing on improving academic forecasting method of forming single groove air pocket.Firstly, This thesis discusses how the single groove' close angle, which is the key parameter affecting forming steady air pocket, affects the air pocket shape. And this part prepares for farther research on the close state of continuous air pocket in large multi-grooves.And then, This thesis does some research on the academic method and numerical dispersing method of forecasting forming steady air pocket in large multi-grooves.Finally, This thesis discusses the inner shape and arrangement and the main factors which affect forming steady air pocket after setting the baffles, such as ship velocity, geometrical scale of baffle, quantity of baffle, pressure distributing and so on.The research approves that the close angle reduces with close length of air pocket increasing; and disposing proper baffle is advantageous to forming continuous air pocket. The thesis finds the choosing method of baffle position, shape and quantity, and how the close length of every air pocket segment affects forming continuous air pocket. This thesis establishes foundation for farther research to air pocket resistance reduction.