双桨客货轮自航船模操纵性试验研究

本文通过一组典型双桨船型,即常规船型、双尾鳍型及双尾型船的自航船模操纵性试验,探索了双桨船的操纵特点,分析研究了螺旋桨旋向及船型对操纵性的影响规律。研究表明:内旋桨使回转性及错车性能略有下降,但错车仍有正常转向,车舵并用能得到理想的效果。内旋使倒航性能大为改善,使倒航可操。单机倒航时出现有规律的反常转向,可利用作为倒航的操纵手段。双尾鳍船的回转性能优于另两种船型,倒航性能及车舵并用的转首性能亦优于常规型船,是具有良好操纵性的一种船型。双尾鳍船型配以内旋桨方案有广阔的应用前景。

FREE-RUNNING MODEL TEST INVESTIGATION ON MANOEUVRABILITY OF TWIN-SCREW CARGOPASSENGER SHIPS

Using a series of free-running model, manoeuvring features of twinscrew ships for three typical ship types, i. e, conventional, twin-skeg and twin-tail ship types, are experimentally investigated and the influence of direction of propeller rotation on manoeuvring performance is researched. Itis shown that inward rotating propellers slighth decrease ship turning ability and course changing ability as compared with that of side screw in different rotating. However, a ship with inward rotating propellers will still have proper course change with side screw in different rotating and may have good manoeuvring effect in the case of combined action of rudders and propellers. Moreover, for given ship type inward rotating propellers make the ship steerable at astern manoeuvre, so that astern manoeuvrability is improved, and unusual course change appeares in the case of astern manoeuvring with one side engine. The twin-skeg ship is a ship type with good manoeuvrability. Its turning ability is superior over that of the other two ship types. Its astern manoeuvrability and course changing ability under combined action of propellers and rudders is also better than that of conventional ones. The twin-skeg ship type with inward rotating propellers will have an encouraging prospect for application.