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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (5): 866-874    DOI: 10.3785/j.issn.1008-973X.2021.05.007
    
Simulation and experimental study of energy-capturing and wave-dissipating floating breakwater with S type blade
Fang-ping HUANG1,2(),Guo-fang GONG1,Can-jun YANG1,2,Hua-yong YANG1
1. School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
2. Zhejiang University Ningbo Institute of Technology, Ningbo 315100, China
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Abstract  

An energy-capturing and wave-dissipating floating breakwater with Savonius type (S type) blade was proposed, in order to promote the intelligent and unattended development of marine aquaculture equipment in open sea area, and to solve the problems of independent energy supply and safety protection?of offshore aquaculture equipment. A two-dimensional wave numerical pool was established, the physical tank test system and the sea test system were built. The hydrodynamic characteristics of the system under different structural parameters were studied by simulation and experiment, and the effects of relative spacing, relative depth of water entry and wave stepness?on the energy capture and wave dissipation performance of the system were analyzed. Results showed that the breakwater system can simultaneously capture energy and eliminate waves, the energy capture performance of the breakwater system increased with the increase of wave steepness, the energy capture effect was the best when the period was 1.6 s, and the wave dissipation performance became better with the increase of relative spacing. The transmission coefficient fluctuated in the range of 0.2~0.8, and the wave dissipation effect was remarkable. In most cases, the energy capture and the wave dissipation performance of the system can not reach the best at the same time. The sea trial operation test verifies the energy capture and wave dissipation effect of the floating breakwater system.

Key words： floating breakwater      S type blade      energy-capturing and wave-dissipating      transmission coefficient      hydrodynamic performance     
Received: 24 July 2020      Published: 10 June 2021
CLC:  TK 730.7  
Fund:  国家自然科学基金资助项目（51605431）；宁波市重大科技攻关资助项目（2015C110015）
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Fang-ping HUANG
Guo-fang GONG
Can-jun YANG
Hua-yong YANG
Cite this article:

Fang-ping HUANG,Guo-fang GONG,Can-jun YANG,Hua-yong YANG. Simulation and experimental study of energy-capturing and wave-dissipating floating breakwater with S type blade. Journal of ZheJiang University (Engineering Science), 2021, 55(5): 866-874.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.05.007     OR     http://www.zjujournals.com/eng/Y2021/V55/I5/866


S型桨叶捕能消波浮式防波堤仿真及试验研究

为了促进开放海域海养殖装备智能化、无人值守化发展，解决离岸养殖装备自主供能以及安全防护问题，针对所提出的Savonius型（S型）桨叶捕能消波式浮式防波堤，建立二维波浪数值水池，搭建物理水槽试验系统和海试系统，通过仿真和试验研究系统在不同结构参数下的水动力学特性，分析探究相对间距、相对入水深度、波陡对系统捕能消波性能的影响. 研究结果表明：该防波堤系统能同时进行捕能和消波，其捕能性能随着波陡的增加而增加，在周期1.6 s时捕能效果最好；消波性能随相对间距的增加而变好，透射系数为0.2~0.8，消波效果显著. 系统捕能与消波性能存在相互影响，多数情况下两者不能同时达到最佳. 海试运行测试验证了该型防波堤的捕能消波效果.


关键词： 浮式防波堤,  S型桨叶,  捕能消波,  透射系数,  水动力性能 
Fig.1 Three dimensional structure of class II S blades
Fig.2 Three-dimensional structure of floating breakwater
参数 数值/m 参数 数值/m
浮管直径 0.33 叶片半径 0.15
浮管间距 0.65 桨叶高 0.61
浮堤长度 3 桨叶间隙 0.3
桨叶直径 0.5 端板直径 0.5
Tab.1 Geometric characteristics of floating breakwater
参数 数值 单位
水深 2 m
吃水深度 1.7 m
HDPE浮体密度 0.95 kg/m3
桨叶排水量 10 kg
桨叶转动惯量 (0.337, 0.337, 0.160) kg·m2
Tab.2 Hydrodynamic parameters of floating breakwater
Fig.3 Grid division of floating breakwater
Fig.4 Simulation experimental model of floating breakwater
Fig.5 Simulation experiment graphs of different relative spacings
Fig.6 Simulation experiment graphs of different relative water entry depths
Fig.7 Simulation experiment graphs of different wave steepness values
Fig.10 Experimental test system of floating breakwater
Fig.8 Schematic diagram of test arrangement for floating breakwater
Fig.9 Physical model of floating breakwater
Fig.11 Testing site of floating breakwater
参数名称 符号 研究变量 单位
入水深度 D 0.70、0.75、0.80 m
堤宽 W 0.6、0.7、0.8 m
波高 h 0.09、0.14、0.19、0.24 m
波长 λ 2.186、2.250、2.377 m
波浪周期 S 1.5、1.6、1.7 s
相对入水深度 D/λ 0.294、0.311、0.316；0.320、0.333、
0.337；0.343、0.356、0.366 		?
相对间距 W/λ 0.252、0.267、0.274；0.290、0.311、
0.320；0.356、0.366、0.367 		?
波陡 h/λ 0.037、0.04、0.041；0.059、0.062、0.064；0.080、0.084、0.087；0.101、0.107、0.109 ?
Tab.3 Test group data of floating breakwater
Fig.12 Energy-absorbing and wave-elimination graphs with different relative spacing values
Fig.13 Energy-absorbing and wave-elimination graphs with different relative water depths
Fig.14 Energy-absorbing and wave-elimination graphs with different wave steepness values
Fig.15 Sea test breakwater structure
Fig.16 Sea test site of floating breakwater
Fig.17 Energy-absorbing and wave-elimination at sea test site
工况 h /m T /s Ct n /（r·min?1） N /（N·m） P/W
1 0.8 3 0.568 19.3 429.0 867
2 0.8 4 0.613 15.2 573.0 912
3 0.8 5 0.642 11.8 772.0 954
4 1.2 4 0.607 15.8 542.1 897
5 1.2 5 0.707 12.6 775.3 1023
6 1.2 6 0.700 10.2 985.8 1053
7 1.5 4 0.689 15.2 818.6 1303
8 1.5 5 0.664 12.3 1001.5 1290
9 1.8 6 0.687 9.8 1245.3 1278
10 1.8 5 0.651 11.8 1053.7 1302
11 2.2 6 0.708 9.8 1290.2 1324
12 2.2 7 0.753 8.5 1575.4 1414
Tab.4 Sea test data table
Fig.18 Energy-absorbing and wave-elimination graphs of sea test
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