...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ocean Engineering >Sailboat propeller drag
【24h】

Sailboat propeller drag

机译：帆船螺旋桨拖曳

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

All but the smallest classes of modern keelboats are fitted with inboard engines and consequently, when making way under sail, the craft experience parasitic drag due to trailing propellers and associated appendages. The variety of screw configurations used on sailing boats includes fixed-blade, feathering, and folding set-ups, with blades numbering two or three. Although the magnitude of the resultant drag is thought to have a significant influence on sailing performance, the published literature having regard to this problem is sparse. Here, the aim was to evaluate the drag effect of fixed-blade propellers of types commonly used on sailing craft. The results of towing tank tests on full-scale propellers are presented for the locked shaft condition; these are presented along with reconfigured data from the few previously published sources. For the case in which the propeller is allowed to rotate, tests were conducted on a typical screw with a range of braking torques being applied. It was hypothesised that the performance coefficients of the Wageningen B-Screw Series could be used to characterise adequately the types of screw of interest and that these could be extrapolated to enable prediction of the drag of a freewheeling propeller; an assessment of this formed part of the investigation.
机译：除了最小型的现代龙骨船之外，所有其他类型的龙骨船都装有舷内发动机，因此，在航行中航行时，由于螺旋桨和相关附件的拖曳，该船会遭受寄生阻力。帆船上使用的各种螺钉配置包括固定叶片，羽化和折叠装置，其中叶片编号为2或3。尽管所产生的阻力的大小被认为对航行性能有重大影响，但是考虑到该问题的已公开文献很少。在此，目的是评估帆船上常用的固定叶片式螺旋桨的阻力效应。给出了在锁定轴状态下在满量程螺旋桨上进行的拖船测试结果。这些内容与先前发布的几个来源的重新配置数据一起显示。对于允许螺旋桨旋转的情况，对典型的螺杆进行了测试，并施加了一定范围的制动扭矩。假设Wageningen B-Screw系列的性能系数可用于适当地表征目标螺杆的类型，并且可以将其外推以预测惯性滑行螺旋桨的阻力。对此进行评估是调查的一部分。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号