基于虚长度法的高速双体船兴波阻力预报

摘要

应用经典薄船理论，以 Michell 兴波阻力积分公式为基础，针对高速船的方尾船型特点，采用“虚长度”法，即在方尾后增加一个虚拟附体以使尾部封闭，通过对 NPL 船模系列（包括3b，4a，4b，4c，5a，5b，5c，6a，6b，6c共10条船型）的文献数据进行分析，总结得到一个计算虚长度的公式，同时对代号分别为4a，5c，6b 的3种船型的兴波阻力进行数值计算，并与文献中的实验数据进行比较。研究表明，3条双体船型的计算结果与实验数据在趋势上吻合较好，在高傅汝德数下误差小于6%，符合工程应用要求。%　　An improved numerical method for calculating the wave resistance of catamarans has been pre⁃sented,based on the classical thin-ship theory and the Michell’s wave resistance integral,which assumes a virtual appendage at the transom stern to seal it off. A formula for calculating the re-attachment length is obtained by analyzing the NPL high speed hull series. To validate the proposed model,a comparison is made between three NPL ship models,4a,5c and 6b,and the corresponding numerical results and experi⁃mental data. The result reveals good correlation,and the calculation error was found to be less than 6% at high Froude number,which indicates that the method is practical and effective for engineering applications.