三体船兴波阻力计算方法比较及兴波干扰研究

分别利用Noblesse细长船理论和薄船理论,以Wigley三体船为例计算傅汝德数在0.20～0.70范围内多个侧体布局下的兴波阻力,探讨三体船两个侧体间和3个侧体之间的兴波干扰,得到对三体船设计具有指导意义的结果。通过与试验结果比较表明,基于首阶近似,不考虑线积分项的Noblesse细长船理论兴波阻力系数的计算结果与薄船理论非常相近。考虑线积分项的Noblesse细长船理论兴波阻力系数计算结果小于薄船理论的计算结果,后者量值更接近于试验值,但是两种计算方法的兴波阻力系数曲线凸凹点对应的傅汝德数相近,表明两种计算方法对兴波干扰现象的计算预测是相近的。研究表明,用薄船理论计算三体船的兴波阻力,探讨多体船侧体之间的兴波干扰目前是一种简便、可行的方法。

The Comparison of Calculation Methods to Wave-making Resistance and Wave Interference in Trimaran

Based on Noblesse＇s New Slender Ship Theory and Michell Thin Ship Theory, this paper calculates the wave-making resistance of Wigley form in the Froude number between 0.20 and 0.70 in several side hulls positions, and discusses the wave interference effect between two side hulls and among three side hulls, and also obtains some results which are useful to the design of trimaran. According to the contrast to experimental results, if we neglect the effects of line integral in the Noblesse＇s New Slender Ship Theory with zero-order approximation, its results are approximate to that of Thin Ship Theory. If not, the wave-making resistance coefficient got by Noblesse＇s New Slender Ship Theory is less than the results of Thin Ship Theory, which are more close to experimental results. However, the crest and trough of the two curves happens on almost the same location from the view of Froude number axis, which demonstrates that it is similar to forecast the characteristics of the wave interference effect by both meth- ods. The research indicates that the Michell Thin Ship Theory is a simple and feasible way to compute wave-making resistance for trimaran and to discuss the wave interference effect among side hulls.