| 于洋.水流中锚链阻力系数测量的实验设计[J].实验力学,2010,25(3):246~250 |
| 水流中锚链阻力系数测量的实验设计 |
| Experimental Design for the Determination of Anchor Chain Drag Coefficients in Current |
| 投稿时间：2009-05-18 修订日期：2010-01-07 |
| DOI： |
| 中文关键词: 锚链 水流 法向阻力系数 切向阻力系数 试验设计 拖曳水池 |
| 英文关键词:Anchor chain water current normal frictional coefficient tangent frictional coefficient experiment design towing tank |
| 基金项目:浙江省科技计划重大项目资助（2008C03010） |
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| 中文摘要: |
| 为了在水池内测出船模拖曳时锚链在水流中的阻力系数，设计了一套简单而有效的实验方案。考虑到锚链的柔软与笨重，故采取了三项措施：（1）将锚链相邻链环连接处点焊住，使其成一根直杆；（2）将该锚链水平悬挂于拖车之下，用拖车运行速度模拟流速，通过锚链悬挂绳与铅垂线的夹角来计算水流对锚链的作用力；（3）为了消除锚链两个端部对阻力测试的影响，用长、短锚链的阻力差值除以锚链长度差，既得到了单位长度锚链的阻力，又有效地解决了端部影响，进而计算出锚链阻力系数。 |
| 英文摘要: |
| A simple and effective experimental design is presented in this paper to determine anchor chain drag coefficient in a towing tank. Due to the weight and flexibility of chain cable, three measures were taken as follows: (1) making the tested anchor chain into a straight bar by spot-welding the joints of two adjacent links; (2) hanging the tested bar horizontally below a moving carriage to simulate water current, then calculating the resistance based on the measurement of angle between suspending line and perpendicular; (3) in order to eliminate the influence of bar ends, drag force is obtained by dividing the force difference derived from a long bar and a short bar respectively, by the length difference of two bars. Consequently, anchor chain unit drag coefficient induced by water current was easily derived. |
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