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首页> 外文期刊>Ocean Engineering >An axial turbine in an innovative oscillating water column (OWC) device for sea-wave energy conversion
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An axial turbine in an innovative oscillating water column (OWC) device for sea-wave energy conversion

机译：用于海浪能量转换的创新型振荡水柱（OWC）装置中的轴流涡轮机

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Wells turbines, self-rectifying air-driven axial turbines, are typically used to convert pneumatic power available in the periodic reversed airflow in Oscillating Water Column (OWC) device into mechanical energy. However, such turbines suffer from low aerodynamic efficiency; low powers produced, and narrow operating range. The current work proposes the operating principle of using water as the working fluid rather than air by submerging the Wells turbine in the sea water to enhance its performance. This gives an advantage for the turbine operation with a fluid having specific weight higher fluid than air. The analysis is carried out for an innovative device proposed by Boccotti in which a vertical axis hydraulic Wells turbine installed inside a vertical duct and contained in a caisson below the sea water surface. The CFD simulations are performed depend on the steady 3D incompressible Reynolds Averaged Navier-Stokes (RANS) calculations on this type of axial turbine rotor with realizable k - epsilon turbulence model. A comparative analysis between the computational results and experimental results is carried out and a good agreement is found between both results. This paper proved that, the hydraulic (immersed) Wells turbine performance is better than that of the air (conventional) Wells turbine. A substantial improvement in the torque coefficient is achieved with the hydraulic turbine of about 1.4 times the torque of the conventional air turbine. Using water as a working fluid which is the proposed concept leads to a wider operating range unlike using air. In addition, the effects of blade profile and rotor solidity on the turbine performance were clarified computationally. In this work, two kinds of symmetric blade profiles have been used (NACA 0015 and S1046). The present computational investigation was carried out for three rotor solidities (0.64, 0.48 and 0.24) through changing the number of turbine blades (8, 6 and 3 blades). It is found that for a hydraulic Wells turbine operating under oscillating water flow, the rotor geometry preferred is the blade profile of 51046 for the investigated three values of rotor solidities.
机译：井式涡轮机，是一种自整流式气动轴流式涡轮机，通常用于将振荡水塔（OWC）设备中的周期性反向气流中可用的气动动力转换为机械能。但是，这种涡轮机的空气动力效率低。产生的功率低，工作范围窄。当前的工作提出了通过将Wells涡轮机浸入海水中以增强其性能来使用水而不是空气作为工作流体的工作原理。对于具有比空气高的比重的流体的流体，这对于涡轮机运行具有优势。对Boccotti提出的一种创新设备进行了分析，该设备中的垂直轴液压Wells涡轮机安装在垂直管道内，并包含在海水表层以下的沉箱中。使用具有可实现的k-ε湍流模型的这种类型的轴流式涡轮机转子，根据稳态3D不可压缩雷诺平均Navier-Stokes（RANS）计算进行CFD仿真。对计算结果与实验结果进行了比较分析，发现两者之间有很好的一致性。本文证明，液压（浸入式）Wells涡轮机的性能优于空气（传统）Wells涡轮机。用水力涡轮机实现扭矩系数的显着改善，其约为传统空气涡轮机扭矩的1.4倍。所提出的概念是使用水作为工作流体，与使用空气不同，导致了更宽的工作范围。另外，通过计算明确了叶片轮廓和转子坚固性对涡轮性能的影响。在这项工作中，使用了两种对称的叶片轮廓（NACA 0015和S1046）。通过更改涡轮叶片（8、6和3个叶片）的数量，对三个转子强度（0.64、0.48和0.24）进行了计算研究。已发现，对于在振荡水流下运行的液压Wells涡轮而言，转子的几何形状优选为51046的叶片轮廓，以研究转子的三个固体值。

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