593 / 2019-01-19 23:18:32

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 was adopted to study the influence of biomimetic wavy leading edge on the aerodynamic performance of HP turbine blade. Tow different types of wavy leading edge--tubercle or invagination are studied to compare their improvement effect. And sensitive analyse of different spanwise length is searched, which tells us that influence at blade-root part is very low. On the basis of these work, orthogonal design is chosen to optimize the parameters of wavy leading edge. As a result, the final bionic blade has stronger acting ability than original blade. At fifty percent mass-flow condition, compared with original blade, 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.