Characteristic analysis of Magnus rotating marine energy saving device
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摘要:目的 船舶助力航行设施可降低航运成本，提高经济效益，一定程度上还可改善海洋环境。基于Magnus效应原理，通过数值模拟方法，研究一种船舶助力航行设施（旋筒风帆）在风场中的力学性能。方法 分析风帆推力、横向力，以及旋筒所需驱动扭矩随旋筒的转速、风速、风向角的变化规律，并以一艘安装有旋筒风帆的散货轮为对象，评估其节能效果。结果 结果表明：风帆产生的推力和横向力随风速及旋筒转速的增加而增大； 当风向角为90°时，节能效果最好，但推力在到达峰值后会逐渐减小，风帆节能效果随风向角变化；驱动旋筒旋转会消耗功率，在产生推力的同时也会产生使船舶偏航的横向力。结论 研究结果可为船舶旋筒风帆优化设计提供一定的技术支持。Abstract:Objectives Ship assisted navigation facilities can not only reduce the shipping cost and improve the economic benefits, but also improve the marine environment to some extent. The mechanical properties of rotor sail in the wind field as a kind of ship assisted navigation facility in ships are numerically simulated based on Magnus effect principle.Methods The variation rules of the thrust, lateral force and driving torque of the rotor sail with rotation speed, wind speed and wind direction angle are analyzed. A bulk carrier with rotor sails is taken as calculation case to assess the level of energy-saving.Results The results show that, the thrust and lateral force increase with the increase of wind speed and rotating speed, the highest level of energy-saving is achieved when the wind direction angle is nighty degrees, but the thrust reaches a peak value and then decreases gradually. The energy-saving varies with the wind direction angles, but driving the rotor sail requires power consumption and a lateral force will be produced as wind direction is nighty degrees which can cause the ship to yaw.Conclusions The results given in this paper can provide technical support for optimal design of the sail.
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Keywords:
- Magnus effect /
- green ship /
- rotor sail /
- numerical simulation /
- energy saving assessment
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图 12 推力、横向力随风向角的变化
Figure 12. Variation of thrust and lateral force with wind direction angles
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