三體船阻力性能之研究

Abstract

本三體船阻力性能研究有兩個主要目的，第一是經由改變三體船的側體船不同之縱向位置及橫向位置，找出三體船側船體的最佳位置，並探討不同的側船體位置對三體船之阻力影響。第二是經由側船體之曲面船身向內側與平面船身向內側之阻力試驗，探討三體船的主船體與側船體之間相互干涉影響。 本研究以兩艘三體船船模之阻力試驗，來探討側船體的最佳位置、曲面船身向內側與平面船身向內側對主船體與側船體之間的相互干涉的影響。由試驗的結果發現，在Fn大於0.5時，側船體位置向前時寬度越寬則總阻力係數越小，而當在側船體位置越後面時寬度越窄其總阻力係數越小。側船體為平面船身在內側時，其阻力性能優於側船體為曲面船身向內側。同時由比較結果發現，若能避免主船體艏波與側船體艏波交會所產生激烈的興波及碎波之現象，三體船之總阻力能有效地減少。

The research of the resistance characteristics of trimaran has two purpose:(1)To investigate the effect of side-hull position on the resistance characteristics of trimaran and find out the optimization longitudinal position of side-hulls.(2)To study the effect of side-hull with the hull of curved surface or the plane surface inward on the influence of wave interference between main-hull and side-hulls.

Two trimaran models were used to study the optimization position of side-hulls, the influence of side-hull with the hull of curved surface and the plane surface inward on the wave interference of trimaran by ship model test. The test results show that when the Froude number is greater than 0.5, the total resistance coefficient is always lowest at the forward and outboard position of side-hulls or backward and inboard position of side-hulls. Furthermore, the resistance tests of the effect of side-hull with the hull of curved surface and the plane surface inward revealed that the resistance performance of the plane surface is better than that of curved surface. Finally, through the comparison of test results, the total resistance coefficient of the trimaran could be decreased significantly if the interference of bow waves between main-hull and side-hulls could be avoid.