Development of Evaluation Method for Propulsive Performance of a Ship Equipped with Podded Propellers

我们制作了一艘中型散货船（Lpp=150m）的小型模型（Lpp=2.50m）以及小型双吊舱螺旋桨（D=0.080m）和一个测力计，仅测量吊舱螺旋桨的推力。为了获得推进性能，我们在九州大学进行了各种试验，如阻力试验、P.O.T试验、假舱系统/真舱系统（推杆式和牵引机式）螺旋桨试验和载荷变化试验。在得到的结果基础上，综合利用各种结果对推进性能进行了分析。在分析中，吊舱和支板可以看作是船体的附属物或推进器的一部分。我们给出了这两个结果，并讨论了方法的合理性。另一方面，根据上述实验进行理论计算，利用九州大学开发的面板程序，得到模型船的推进性能。通过这些方法，我们阐明了小型双吊舱螺旋桨船模推进性能的机理。

We made a small model(Lpp=2.50m) of a medium-size bulk carrier(Lpp=150m) together with small twin podded propellers (D=0.080m) and a dynamometer to measure only the thrust of the podded propeller. In order to obtain the propulsive performance, we perform various experiments at Kyushu University, such as resistance test, P.O.T, propeller tests with dummy pod system/with real pod system(pusher and tractor types) and the load varying tests.From the obtained results, we analyse the propulsive performance by the combined uses of various results. In analysis, the pod and strut can be treated as appendages of the hull or parts of the propulsor. We show both results and discuss on the reasonable ness of the methods.On the other hand, we perform theoretical calculations corresponding to the above experiments to obtain the propulsive performance of the model ship by using a surface panel code which was developed at Kyushu university.By these approaches, we clarified the mechanism of the propulsive performance of the ship model with small twin podded propellers.