近几十年来,导管螺旋桨的试验研究取得了巨大的进展。因它显著提高了重负荷桨的推进效率,故在拖船、拖网渔船以及大功率的超大型油船上得到了广泛的应用。从节省能源角度出发,人们对导管桨的应用也更加重视。但在实际使用中,由于导管内壁的严重空泡侵蚀,造成钢板穿孔漏水,大大降低推进效率,为此必须进行修补或更新,这 In recent decades, pilot propeller experimental research has made great progress. Because it significantly improves the propulsion efficiency of heavy-duty propellers, it has been widely used in tugboats, trawlers and super-large tankers of high power. From the perspective of saving energy, people pay more attention to the application of catheter paddle. However, in actual use, due to the severe cavitation erosion on the inner wall of the conduit, the perforation of the steel plate is leaking and the propulsion efficiency is greatly reduced. Therefore, it is necessary to repair or update it