一类低速船舶兴波阻力的数值研究

本文根据下潜源思想改进的Hess-Smith方法和有限水深慢船理论,编制了相应的船体势流和兴波阻力的计算程序.通过对球鼻首进行特殊处理,将该程序运用于一类低速船舶——某散货船母型及两种改型的波阻研究.结果表明本方法可很好地区分仅球鼻首有微小差别的母型及其改型的兴波性能,该类船舶在同一水深下的波阻变化规律与无限水深一致.最后选出一种较优船型进行了进一步研究,探讨了浅水效应.

A Numerical Study on the Wave Resistance of a Class off Low Speed Ships

A method for calculating the wave resistance based on the theory of slow ships on finitely deep waters and another one for calculating the double model potential flow based on the Hess-Smith method improved by the concept of submerged source patches are presented. Programs for numerical calculation are written and a numerical study is made on a class of low speed ships, bulk ships with bulb bows, including the original model HO and two slightly modified ones H1 and H2. The resistances of the three models are calculated for the case of infinitely deep waters. It is shown that the results of calculation are in good agreement with those obtained experimentally. This shows that the method proposed is capable of telling apart the slight differences between resistances of the threemodels. The curves of resistance and wave spectra are given for the three ships on finitely deep waters. For model H2, whose resistance is less than those of the other two, the resistance and spectra are given at four water depths. The influence of water depth on resistance and spectra is also discussed.