49results about How to "Reduce cavitation damage" patented technology

The invention relates to a folded-line shape diversion pier of a spillway. The folded-line shape diversion pier comprises an upper pier, a middle pier and a lower pier or comprises a middle pier and a lower pier. The upper pier is a semi-cylindrical pier, the middle pier comprises a middle pier body, an overhead view surface of the middle pier body is an isosceles trapezoid, side view surfaces of the middle pier body are right triangles, a pier head in the shape of a semicircular oblique frustum with a small bottom and a large top is arranged on the front oblique surface of the middle pier body, the lower pier comprises a pier body in the shape of a triangular prism,wherein the overhead view surface of the pier body is a rectangle and the side view surfaces are right triangles, a pier body in the shape of an isosceles oblique trapezoidal prism with a small front portion and a large rear portion is arranged on the front oblique surface of the pier body in the shape of the triangular prism, side view surfaces of the pier body in the shape of the isosceles oblique trapezoidal prism are parallelograms, and a pier head in the shape of a semicircular oblique cylindrical table is arranged on the front oblique surface of the pier body in the shape of the oblique trapezoidal prism. The folded-line shape diversion pier has the advantages that the folded-line shape diversion pier has a regular size, stress on each pier head is simple, a downstream flow condition is improved, the construction difficulty is reduced, requirements on the strength of materials is lowered, and the folded-line shape diversion pier is adaptable to flow rate variation in a large range.

The invention discloses a ship drag reducing method and system through using reverse bubbles. The method involving a reverse bubble generating device, and a reverse bubble transmitting device, whereinthe reverse bubble generating device is used for generating reverse bubbles and stored with first liquid. The steps comprise that inflating the reverse bubble generating device with gas, and then with a set speed, adding dropwisely second liquid into the device to generate suspended liquid droplets on the liquid surface; further, increasing the dropping speed to send the suspended liquid dropletsinto seawater to generate the reverse bubbles, wherein each reverse bubble is a gas-liquid structure, namely liquid contains gas films and the gas films are provided with the liquid; and finally, utilizing the reverse bubble transmitting device to transfer the reverse bubbles generated in the reverse bubble generating device on the surface of a ship body. According to the ship drag reducing method and system through using the reverse bubbles, the reverse bubbles are used for replacing common bubbles to realize ship drag reducing, which leads to a new drag reducing method; and by designing a special reverse bubble generating device to generate the reverse bubbles, the effect of ship drag reducing can be realized.