高负荷螺旋桨水动力性能试验研究

以某大型集装箱船高负荷螺旋桨为研究对象,分别采用大侧斜、反弯扭叶片和毂帽鳍等技术进行螺旋桨优化设计,以改善螺旋桨的空泡和水动力性能.设计了5型螺旋桨,分别在空泡水筒进行了模拟伴流场中的空泡和激振力试验,并在拖曳水池进行了敞水试验.试验结果表明,采用大侧斜可有效减小螺旋桨诱导船艉激振力;反弯扭叶片螺旋桨空泡性能较好,有较低的螺旋桨诱导船艉激振力水平;桨毂帽鳍可改善毂涡空泡,模型试验状态下可提高推进效率2%左右.

Experimental investigation on hydrodynamic characteristics of a heavy loading propeller

Highly skewed propeller,negative curved blade and PBCF(Propeller Boss Cap Fins) techniques are applied to improve the cavitation characteristics and the hydrodynamic performances of the heavy loading propeller for a large container vessel.Five types of the propeller have been designed based on the above-mentioned techniques and investigated by model tests.The cavitation observations and fluctuating pressure measurements were carried out in the simulated wake field in a cavitation tunnel,and the open water tests were performed in a towing tank.The results obtained from model tests showed that the fluctuating pressures on ship hull induced by cavitating propeller could be reduced effectively by the highly skewed propeller.The cavitation extent and fluctuating pressure of the propeller with negative curved blades are much less than that of conventional one.The boss vortex cavitation of propeller can be avoided by PBCF,and an increase of 2% in propulsion efficiency has been measured in the model tests.