摘要 |
The present invention provides an energy-saving duct for attaching to the stern of a ship, the circular duct being attached in front of a stern propeller of radius R, wherein the duct has a radius of 0.7R at the back end and an angle of attack of 12 degrees. According to the present invention, by rectifying and accelerating the flow of the flow field entering and passing through the interior of the duct, the pressure recovery of the stern is promoted and thereby the resistance performance of the ship is improved, and moreover, the propulsive performance of the propeller can be improved by the changes in the wake entering the propeller. Furthermore, by suitably configuring the angle of attack of the duct with respect to the inflow flow field, not only can the drag of the duct itself, which is an addition, be minimized, but additional thrust provided by the duct itself can be expected. Also, according to the present invention, as the shape of the duct is comparatively simple and installation can be completed simply by attaching the duct to the stern, production and installation are simple and cost therefor is economical, and the present invention has the benefit of being applicable not only to new hulls but also to existing hulls in operation. |
申请人 |
KOREA INSTITUTE OF OCEAN SCIENCE & TECHNOLOGY |
发明人 |
KIM, Kwang Soo;KIM, Yoo Chul;KIM, Yoon Sik;YIM, Geun Tae;AHN, Hae Seong;LEE, Young Yeon |