不同桨叶数量的高转速明轮推进性能
Propulsive Performance of High Rotation Speed Paddlewheels with Different Numbers of Paddles
杨静雷 1邓志鹏 1侯亮 2尚彦伶1
作者信息
- 1. 集美大学轮机工程学院,福建 厦门 361021
- 2. 上海析易船舶技术有限公司,上海 200000
- 折叠
摘要
[目的]研究不同桨叶数量的高转速明轮推进器力学特性,以解决目前高转速明轮推进器流场特性不清晰的问题.[方法]采用计算流体力学,基于N-S方程,对系列桨叶在不同转速下的推力、升力、力矩以及流场特性等进行研究,并与试验结果进行对比分析.[结果与结论]本研究提出的计算方法对于高转速明轮的推力在v<5 m/s和v=9 m/s牵引航速段时误差较大,但在峰值v=7 m/s附近误差普遍在9%以下,且总体变化趋势与试验结果接近;明轮在不同牵引航速和不同转速下均有一个最佳推力曲线,且桨叶数量不同时最佳的推力也存在差异;明轮在牵引航速v<5 m/s时有轻微颤振,主要由于桨叶的进流角设计与牵引航速不完全匹配有关,而过高的转速(r>2 500 r/min)不会对明轮的推进效率产生增益;在高牵引航速(v>8 m/s)状态下可以通过增加桨叶数量的方式提高明轮的推进效率.
Abstract
[Objective]To address the unclear flow field characteristics of high rotation speed paddlewheel thrusters by studing the mechanical properties of such thrusters with varying numbers of paddles.[Method]In this paper,the researchers used computational fluid dynamics and the N-S equation to investigate the thrust,lift,torque,and flow field characteristics of a series of paddles at varying rotational speeds.Then the results with experimental data were compared and analyzed.[Result and Conclusion]The calculation method proposed in this study has a large error for the thrust of high rotation speed paddlewheel when v<5 m/s and v=9 m/s,but the error is generally below 9%near the peak v=7 m/s,and the overall trend is close to the experimental results;the paddlewheels have an optimal thrust curve at different towing speeds and different rotational speeds,and the optimal thrust curves are different for various numbers of paddles;there is a slight chattering of the paddlewheels at the towing speed v<5 m/s,mainly due to the design of the inlet angle of the paddle not fully matching the speed,and the high rotational speed(r>2 500 r/min)will not have a gain on the propulsive efficiency of the paddlewheel;the thrust efficiency of the paddlewheel can be improved by increasing the number of paddles under the state of high towing speed(v>8 m/s).
关键词
高转速明轮推进器/桨叶数量/牵引航速/最大推力Key words
high rotation speed paddlewheel thruster/number of paddles/towing speed/maximum thrust引用本文复制引用
基金项目
上海市科委前瞻性创新研究基金(20dz1101700)
出版年
2024
国家科技期刊平台
NSTL
万方数据