Development of downwind horizontal axis wind turbine for low wind speed condition

为了在低风速区获得与风速和风向变化相对应的稳定的大功率，对转子在塔身下游侧旋转的下风向型小型水平轴风力机进行了试验研究。大型风力机的安装受到场地空间、气动噪声和电功率波动等问题的限制。因此,小型风力发电机的发展预计当地的能源,也可以设置在城市地区大量的电力需求存在然而,应该安装空间小,能够期望输出等条件即使在低风速被克服作为推广的条件,因为在城市里areaThe顺风类型水平轴风力发电机的性能评估是解决这些问题在这个研究。实验中改变了顺风型风力机的叶片俯仰角，并对其性能进行了评价。此外，对翼型后掠和推进角进行了不同的改变，以适应广泛的应用，并进行了试验。此外，为了阐明顺风型对逆风型水平轴风力机的特性，所采用的转子性能实验结果表明，顺风型和逆风型的最佳俯仰角是不同的。顺风型和逆风型对前倾角的变化较为敏感，但对后倾角的性能变化较为平缓，顺风型在最佳俯仰角下比逆风型获得最佳俯仰角，并且获得了后倾角和前倾角的影响，并获得了外观后悔倾向

An experimental research work on the small horizontal axis wind turbine of the downwind-type, which the rotor rotates on the tower downstream side, is done for obtaining high power with stability corresponding to the change of wind speed and wind direction in the low wind speed regionInstallation of large wind turbines is limited by the problem of a site space, an aerodynamic noise and the electric power fluctuation. Therefore, the development of the small wind turbine is expected as the local energy, which can be setup also in the city area where a lot of electric power demands exist However, installation space should be small, and the condition such as being able to expect the output even in a low wind speed be overcome as a condition because of popularization in the city areaThe performance of the downwind type horizontal axis wind turbine was evaluated as solution to these problems in this research. The blade pitch angle of the downwind type wind turbine was changed in the experiment and the performance was evaluated. Moreover, the airfoil sweepback and the advancing angles were variously changed to correspond to wide use and it experimented. In addition, the performance that applied the rotor used to experiment to clarify the feature of the downwind type to the upwind type horizontal axis wind turbineAs a result, the optimum pitch angle in the downwind type is different from those of the upwind type. Moreover, the downwind type and the upwind type have understood it is sensitive for the change in the advancing angle though are mild the change in the performance into the sweepback The downwind type was obtained in the optimum pitch angle than the upwind type, and moreover, the influence of the sweepback and the advancing angle was obtained and the appearance regret tendency was obtained