• 作者： 柯永澤; 辛敬業; 孫永清
• 作者服務機構： 國立臺灣海洋大學造船工程研究所
• 中文摘要： 本文之目的是在計算由空泡螺槳對船殼所誘導之表面力，此法是根據Breslin等人所發表，其有效跡流計算是以Huang及Groves所建立之有效跡流模式為基礎，並應用Wilson、Van Houten、Kerwin等之觀念，將其擴展至對非軸對稱體有效跡流的估算；螺槳表面非定常負荷及其空泡延伸量之計算，是以渦格法為基礎之非定常螺槳升力面模式（MIT-PUF-3A）於時域中計算螺槳非定常受力，並應用空泡理論疊算螺槳表面空泡延伸量，其中負載部分是由渦流強度模擬，而厚度與空泡量部分是以源流強度模擬，渦流強度求出後，將其轉成等值之偶流分佈，再計算空泡螺槳對船體上場點產生隨時問變化之誘導速度勢，並於船體上分佈偶流，以滿足Dirichlet內表面邊界條件，再計算船體外表面速度勢之總和及其隨時間之變化，最後應用非定常Bernoulli方程式求解壓力隨時間之變化量，而此處之速度項將由偶流小板上之強度分佈係數直接求得。本文並將螺槳對船體表面所產生壓力隨時間變化量之計算結果與實驗數據做比較。
• 英文摘要： The object of this work is to develop a numerical method to calculate the hull surface forces inducedby cavitating propellers．In this paper, a method based on the numerical model developed by Breslinis presented. In this method, the effective wake is calculated using the method developed by Huang andGroves, and later modified by Wilson, Van Houten and Kerwin. The MIT-PUF-3A (Massachusetts Instituteof Technology Propeller Unsteady Force 3A) program is then used to analyze the unsteady flow aroundpropellers in the effective wake and to compute the propeller induced potentials on the hull surface. Apotential based dipole only higher order panel method is used to calculate the flow around the ship hull,including the propeller influence. For calculation of the potential induced by the ship hull, Johnson'shigher order panel method is used; i.e., a second order panel geometry is used, and a second order normaldipole is distributed on each panel. An internal Dirichlet boundary condition is imposed on each panel,and the total potential on the body inner surface is set to be zero．The pressure fluctuations on the hullsurface can then be calculated from solutions of the dipole strength by applying Bernoulli’s equation,in which the velocity term can be obtained easily from the dipole strength coefficient of each panel．Inthis paper, the computational results of the pressure fluctuations generated by propellers on three shiphulls are presented and compared with experimental data obtained from three different cavitation tunnels.
• 中文關鍵字： surface force; cavitation propeller; higher order dipole only panel method
• 英文關鍵字： --