Study on the improvement of the aerodynamic performance of a straight winged vertical axis wind turbine

通过数值分析和现场试验，研究了直翼垂直轴风力机涡轮机的性能估算问题。通过研究，我们可以确认SWVAWT可以达到可以商业实现的性能。在数值模拟中，首先对单翼绕流进行了湍流模型性能检验。为了进行旋转机翼的分析，必须找到一个网格划分相当粗糙的合适模型。在这项研究中，我们发现，DES分析与Spalart-Allmaras模型是最好的方式，我们的数值模拟。将该模型应用于具有NACA 0018三翼的旋转涡轮机的分析。通过非定常流场分析，得到涡轮机的最佳设计工况为实度为0.079，叶尖速比为3.75，功率系数为0.45。在现场试验中，我们开发了一个控制系统，它可以使恒定的叶尖速比运行，以及制动系统，以避免过度旋转。通过单机运行，可以确认在叶尖速比为3时，功率系数接近理论值。

We studied the performance estimation of the straight winged vertical axis wind turbine by means of numerical analysis and a field test. Through the investigation, we could confirm that the SWVAWT can reach the performance, which can be commercially realized. In numerical simulation, we have tested the performance test of the turbulence models as the first step for the flow around a single wing. It was necessary to find an appropriate model with a rather rough meshing, so that rotating wing analysis can be performed. In this study, we found that a DES analysis with Spalart-Allmaras model is the best way of our numerical simulation. We applied this model to the analysis of rotating wind turbine with three NACA0018 wings. By performing unsteady flow analysis, we obtained an optimal design condition of the wind turbine to be with a solidity of 0.079 and the tip speed ratio of 3.75, which gave power coefficient of 0.45. In the field test, we have developed a control system, which enables the operation of constant tip speed ratio, as well as braking system to avoid over-rotation. Through stand-alone operation we could confirm the power coefficient to be close to the on by theory at the tip speed ratio of 3.