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提出一种新型垂直轴螺旋型风力叶轮。采用计算流体动力学软件Fluent,选取SST k-ω湍流模型对提出的新型螺旋型叶轮和传统的直线型叶轮周围的非定常三维湍流流场进行数值模拟,分析两种叶轮的力矩系数、周围速度分布、水平截面上的流谱及涡量分布。研究结果表明:螺旋型叶轮的力矩系数波动幅度较小,平均力矩系数较大,叶轮输出功率较稳定;螺旋型叶轮内部的低压区和外部高压区间的压差是促进叶轮旋转的动力;螺旋型叶轮的空间三维形状导致各水平截面的叶片攻角不同,流谱及涡量分布有明显区别,而直线型叶轮不同截面的涡量分布基本一致。
A new type of vertical axis helical wind impeller is proposed. The computational fluid dynamics software Fluent was used to select the SST k-ω turbulence model to simulate the unsteady three-dimensional turbulent flow field around the proposed new spiral impeller and the traditional linear impeller. The torque coefficients of the two impellers, the surrounding velocity Distribution, Flow Spectrum and Vorticity Distribution in Horizontal Section. The results show that the torque coefficient of helical impeller is less fluctuated, the average torque coefficient is larger and the output power of the impeller is more stable. The pressure difference between the low-pressure area and the external high-pressure area of the spiral impeller is the impetus for impeller rotation. The three-dimensional shape of the impeller results in different angles of attack of the blades at each horizontal cross section, and significant differences in flow spectra and vorticity distributions, while the vorticity distributions of different cross sections of the linear impeller are basically the same.