【摘要】 在小流量工况下,汽轮机叶片特别是末几级将出现失速,将大大削弱汽轮机做功能力。为寻求改善方案,利用仿生原理对叶型进行优化。模仿座头鲸鳍,在核电高压末级叶片的前缘添加一列凸起结构和内陷结构的波浪前缘,用以提高汽轮机在小流量下的做功能力。同时,使用正交优化方法,通过分析凸起结构和内陷结构的4个控制参数对做功能力和气动性能的影响,确定各参数的最佳值。结果表明:凸起结构和内陷结构虽在参数设置上相同,但参数的影响不同;仿生叶型通过优化得出最佳参数配置,整体单支动叶产生的轮周功率较原始叶型提升了7.8%。更多还原

【Abstract】 Under low load conditions, the flutter usually occurs in steam turbine especially in the last few stages, greatly reducing the aerodynamic performance of the turbine. In order to improve this phenomenon, a biomimetic modification inspired by the humpback whale fins for blade optimization is discussed. A series of tubercles and invaginations are added at the leading edge of the high-pressure final stage of nuclear steam turbine to build the wavy leading edge. This biomimetic blade is deemed to make contribution on aerodynamic performance of turbine in low mass flow condition.In the aspect of optimization, the orthogonal method is employed. Four control parameters are picked by researching aerodynamic performance and flow situation of the blades having the tubercles and invaginations with different parameter values. The results show that the same parameter influence the tubercle and invagination in different ways and in fifty percent mass-flow condition, the wheel power of the turbine with the biomimetic blade was increased by 7.8% compared with the original blade.更多还原