624 / 2019-01-20 14:40:55

Biomimetic improvement of wavy leading edge in nuclear steam turbine high-pressure last stage

steam turbine blade; wavy leading edge; orthogonal design; streamwise vortice; numerical simulation

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　Flutter of steam turbine at low mass-flow load can weaken the efficiency of cascade. In this paper, three-dimensional numerical simulation is adopted to study the influence of biomimetic wavy leading edge on the aerodynamic performance of HP turbine blade. Two different types of wavy leading edge with tubercle and invagination are studied to compare their effect. And sensitive analysis of different spanwise length is searched. Simulation results show that when biomimetic structure arranged at blade-root part, it has low influence. Based on work, orthogonal design is chosen to optimize the parameters of wavy leading edge. The optimized blade with bionic foil has stronger acting ability than original blade. Compared with original blade, at fifty percent mass-flow condition, torque of the bionic blade is increased by 5%. Through flow visualization analysis, we find that the generation and evolution of the streamwise vortices make some working fluid attached blade in advance, that expands the high pressure region of the blade and the acting ability in improved.