| 摘要 |
Method and device for reducing the frictional resistance against an object which is moving in a fluid, during which movement a stream of gas is blown out along that side or those sides of the object (26) which are in contact with the fluid. The side or sides are covered with, or constituted by, a material (28) pervious to gas and presenting a low pressure drop in the gas under its passage through the material. In connection with the exhaust through the material the gas is imparted pressure pushes, e.g. by the material (28) constituting a wall in a chamber (16) with a variable volume. The pressure pushes promote the production of micro-bubbles when the gas is exhausted through the material (28). |
