To reduce energy consumption during cruising operation of ships by arranging ejection ports for ejecting pressurized gas slantly backward in water on a submerged surface and making the inside walls of the ejection ports flexible.
When gases such as air supplied from an air intake port 4a and combustion gas of a gas generating means 4i are pressurized and ejected slantly backward from plural ejection ports 3 on a submerged surface 2, such a state appears as interposing air bubbles and air layers between the submerged surface 2 and boundary layer behind the ejection ports 3. Upon such conditions that flexibility is given to the inside wall of each ejection port 3 and pressures on both surfaces of the inside wall are balanced each other by an elasticity applying means 5, wave-like vibration takes place on the inside wall owing to vibration of the pressurized air and pulsation of the pressure from each ejection port 3 so that the generation of micro bubbles may be expedited, gas feed into the boundary layer may be promoted and gas component is interposed inside of the boundary layer so as to reduce the frictional resistance of the submerged surface 2. Accordingly the energy consumption during cruising run of ships, etc., can be reduced.
| JPS61175200 | METHOD OF REDUCING FRICTIONAL RESISTANCE OF INTERFACE BETWEEN SOLID AND FLUID |
| WO/2018/091905 | COMPRESSOR BLADE SURFACE PATTERNING |
| WO/1997/030886 | MULTIPLE-MODE WING-IN GROUND EFFECT VEHICLE |
TAKAHASHI YOSHIAKI
YOSHIDA YUKI
ISHIKAWAJIMA HARIMA HEAVY IND
Next Patent: MANUFACTURE OF NAIL AND MOLDING DICE THEREOF