Analysis of Hydrodynamic Performance of a Low-speed Current Turbine Blades
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摘要: 为了在低流速下提高水轮机的效率,利用计算流体力学软件Fluent对设计在低流速下工作的叶片进行数值模拟,研究尖速比对低流速水轮机叶片的功率特性、流场特性的影响。研究结果表明:尖速比不仅会影响叶片周围的流场,而且对叶轮尾流场有一定的影响,尖速比越小,其尾流场恢复的越快。Abstract: To improve turbine efficiency at low-speed flow, the computational fluid dynamics software Fluent was used to simulate numerically the blades designed to work at low speed flow for researching the effect of tip speed ratio on the power characteristics and flow field characteristics of low-speed turbine blades. The simulation results show that the tip speed ratio not only affects the flow field around the blade, but also has a certain effect on the wake field of the turbine, and the smaller the tip speed ratio is, the faster the wake field recovers.
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图 4 叶轮水洞实验照片[15]
表 1 叶片几何参数
翼展方向位置r/R 叶片扭转角φ/(°) 弦长c/m 叶片相对厚度/% 0.113 38.14 0.126 25.8 0.170 30.39 0.125 25.3 0.224 25.95 0.124 23.5 0.293 21.86 0.122 21.3 0.373 18.45 0.120 18.6 0.462 15.55 0.117 15.7 0.554 13.11 0.114 14.8 0.646 11.11 0.109 14.2 0.734 9.44 0.104 13.7 0.815 8.04 0.099 13.2 0.884 6.91 0.094 12.7 0.938 6.02 0.089 12.4 1.000 5.09 0.084 12.1 -
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