Database of sail shapes versus sail performance and validation of numerical calculations for the upwind condition
Database of sail shapes versus sail performance and validation of numerical calculations for the upwind condition
复制标题
DOI：
10.1007/s00773-009-0056-3
复制
发表时间：
2009-06-01
影响因子：
2.6
通讯作者：
Maeda, Naotoshi
中科院分区：
文献类型：
--
作者：
Masuyama, Yutaka;Tahara, Yusuke;Maeda, Naotoshi
建立了一个全尺寸三维帆型数据库，并给出了国际测量系统（IMS）型帆在逆风条件下的气动力系数。三维形状数据用于输入的数值计算和结果进行比较与测量的帆性能。利用富锦风帆测功船对风帆的形状和性能进行了测量。这是一艘全长10.3米的船，其中安装了称重传感器和CCD摄像机，以同时测量帆的力和形状。同时，船的航行条件，例如，测量船速、横倾角、风速和风向角。测试的帆配置是：主帆与130%的三角帆，主帆与75%的三角帆，和主帆单独。在几个垂直位置测量帆的形状参数，这些参数由弦长、最大吃水深度、最大吃水深度位置、在前翼的进入角和在后翼的离开角定义，所有这些最终产生帆几何形状的三维坐标。本文列出了外形数据表，沿着列有气动力系数。此外，数值模拟进行了测量的帆形和航行条件的能力和局限性，通过详细的比较与测量的方法进行调查。采用了两种数值方法：涡格法（VLM）和基于雷诺平均Navier-Stokes（RANS）的计算流体动力学方法。该帆型数据库与数值计算结果相结合，为IMS型帆在逆风条件下的性能分析提供了良好的基准。
A database of full-scale three-dimensional sail shapes is presented with the aerodynamic coefficients for the upwind condition of International Measurement System (IMS) type sails. Three-dimensional shape data are used for the input of numerical calculations and the results are compared with the measured sail performance. The sail shapes and performance were measured using sail dynamometer boat Fujin. This is a boat of 10.3-m length overall in which load cells and CCD cameras were installed to simultaneously measure the sail forces and shapes. At the same time, the sailing conditions of the boat, e.g., boat speed, heel angle, wind speed, and wind angle, were measured. The sail configurations tested were: mainsail with 130% jib, mainsail with 75% jib, and mainsail alone. Sail shapes were measured at several vertical positions for the shape parameters defined by: chord length, maximum draft, maximum draft position, entry angle at the luff, and exit angle at the leech, all of which finally yield three-dimensional coordinates of the sail geometry. The tabulated shape data, along with aerodynamic coefficients, are presented in this article. In addition, numerical flow simulations were performed for the measured sail shapes and the sailing conditions to investigate the capability and limitations of the methods through detailed comparison with the measurements. Two numerical methods were used: a vortex lattice method (VLM) and a Reynolds-averaged Navier-Stokes (RANS)-based computational fluid dynamics method. The sail shape database, in association with the numerical results, provides a good benchmark for the sail performance analysis of the upwind condition of IMS type sails.