| 摘要: |
| 受条件限制,某些河道的静水航速实船测试不得不在动水域进行.由于动水域水面坡降的存在,船舶推力需克服坡降阻力而不能全部为航行提供动力,对水航速代替静水航速会造成一定偏差.通过在澜沧江动水域进行的静水航速实船测试试验,提出了阻力平衡法和阻力同比法以修正静水航速,两种修正方法结果差异不大,而阻力同比法更为简略.理论和实例分析表明,对水航速是否能代替静水航速取决于坡降阻力所占船舶推力比例的大小. |
| 关键词: 动水域 实船试验 对水航速 静水航速 坡降阻力 阻力平衡法 阻力同比法 |
| DOI： |
| 分类号:TV135.4 |
| 基金项目:云南省科技攻关项目 |
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| Estimating methods for still-water navigation speed in flowing water |
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XU Guang-xiang,CHEN Xi
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(Chongqing Jiaotong University,Chongqing 400074,China)
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| Abstract: |
| In order to achieve the ship still-water navigation speed,some prototype tests have to be implemented in flowing waters due to certain restrictions.The ship navigation speed in flowing waters is different from that in still water because the propulsive force can’t be completely transformed to be the driving force owing to the water gradient.Based on a series of vessel prototype tests for still-water navigation speed conducted in a flowing reach of the Lancang River,this paper presents two methods for correcting still-water navigation speed,the drag balance method and the resistance comparison method.Both methods lead to close results,and the drag balance method is simpler.Theoretical analyses and case studies indicate that whether navigation speed in flowing waters is able to replace still-water navigation speed may depend on the ratio of the resistance due to hydraulic gradient to ship’s propulsion. |
| Key words: flowing water prototype tests navigation speed in flowing waters still-water navigation speed gradient resistance drag balance method resistance comparison method |
