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为实现建造、运行和维护等方面的资源共享,将振荡水柱(oscillating water column,简称OWC)波能转换装置与现有海工结构集成耦合,已成为目前海洋波浪能转换利用的热点问题。以集成于方箱防波堤的双气室OWC装置为研究对象,借助开源代码平台OpenFOAM和造/消波工具箱waves2Foam,采用流体体积法(VOF)捕捉自由面和6自由度(6DOF)动网格求解器模拟垂荡运动响应,对在不同规则波作用下,中墙相对宽度、中墙相对吃水对装置波能转换效率及水动力特性的影响进行数值研究。结果表明,较大的中墙相对宽度能够增强装置的波能转换效率(ξtotal(max)=73%)、降低结构物的相对垂荡位移并对装置前后气室内水柱的振荡幅度与压强变化产生影响;增加中墙相对吃水能显著提高气室在中高频波段波能提取效率(ξtotal(max)=78%),并显著拓宽气室的高效频率带宽(0.9≤ω2h/g≤2.2)。 相似文献
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Many typhoons pass through the East China Sea(ECS) and the oceanic responses to typhoons on the ECS shelf are very energetic. However, these responses are not well studied because of the complicated background oceanic environment. The sea surface temperature(SST) response to a severe Typhoon Rananim in August 2004 on the ECS shelf was observed by the merged cloud-penetrating microwave and infrared SST data. The observed SST response shows an extensive SST cooling with a maximum cooling of 3°C on the ECS shelf and the SST cooling lags the typhoon by about one day. A numerical model is designed to simulate the oceanic responses to Rananim.The numerical model reasonably simulates the observed SST response and thereby provides a more comprehensive investigation on the oceanic temperature and current responses. The simulation shows that Rananim deepens the ocean mix layer by more than 10 m on the ECS shelf and causes a cooling in the whole mixed layer. Both upwelling and entrainment are responsible for the cooling. Rananim significantly deforms the background Taiwan Warm Current on the ECS shelf and generates strong Ekman current at the surface. After the typhoon disappears, the surface current rotates clockwise and vertically, the current is featured by near inertial oscillation with upward propagating phase. 相似文献
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目前全球对能源的需求急速增长,其中对可再生能源的需求也越来越大。中国将成为全球能源消费第一大国,研发高效的可再生能源装备已刻不容缓。我国有大量可开发的海洋波浪能,其中舟山附近海域的波浪能相当丰富。文中研发了适合舟山海域波浪条件的波浪能发电装置。具体研究内容包括以下几个方面:(1)从流体力学理论出发,采用斜坡将水平速度转化为垂向速度,设计了近岸固定式可适应潮位变化的波浪能发电装置。(2)进行了多种结构漂浮摆-斜坡组合的模型试验,找到了最佳结构方案,验证了漂浮摆原理的可行性。利用提升重物的方法获得了模型装置的一级波浪能捕获效率,成功通过液压装置将波浪能转化为电能。(3)建立了基于非稳态RANS的CFD仿真模型,分析漂浮摆式波浪能捕获模块的水动力性能。研究在不同载荷情况下漂浮摆装置的能量输出情况,得到了装置在特定工况下的漂浮摆受力情况,为能量转化系统设计和装置设计制造提供参考。 相似文献
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