Development of Self-Propulsion Test in Circulating Water Channel

本课题的研究对象是循环水航道自航试验的发展。采用两种小型油轮模型(&lt；L_pp&gt；=1.5m和2.0m)。这些相同的模型在西日本流体工程实验室株式会社(FEL)的4号C.W.C.和九州大学(KU)的拖车水箱中进行了测试。通过船体阻力试验、螺旋桨开启试验、自航试验、舵阻力试验以及利用昆士兰大学开发的程序代码进行推进性能计算，明确了以下几项内容。由于C.W.C.2的特点，形状因素有很大的不同。小型螺旋桨(D=4-5 cm)的特性随螺旋桨转速的不同而变化较大。在自航试验分析中，建议使用与设计转速相对应的转速下获得的特性。在没有舵的情况下，船体的自航系数在FEL值和KU值下都是稳定的，但在有舵的情况下，不能得到稳定值。在实船中，首先要对没有舵的船体进行试验，然后根据经验考虑舵对船体自航系数的影响。

The object of this research is development of the self-propulsion test in the circulating water channel (C.W.C.). The two kinds of small tanker models( <L_pp> =1.5m and 2.0m) were adopted. These same models were tested in the No.4 C.W.C. of West-Japan Fluid Engineering Laboratory Co.Ltd.(FEL) and also in the towing tank of Kyushu University(KU). Though the hull resistance test, the propeller open test, the self-propulsion test, the rudder resistance test and calculation of the propulsive performance by using the program code developed in KU, the following items became clear.1. The form factor differs considerably due to the cheracteristics of the C.W.C.2. The characteristics of the small propeller(D=4-5cm) change fairly due to the rate of revolutions of the propeller. In the analysis of the self-propulsion test, it is recommended to use the characteristics obtained at the rate of revolution corresponding to the designed speed.3. Though the self-propulsion factors are obtained stably in FEL and KU for the hull without the rudder, we can not get stable values when the rudder are fitted to the hull.4. In the C.W.C., the model hull without the rudder should be tested and then the effect of the rudder on the self-propulsion factors should be considered according to the experience.