Influence mechanism of low-pressure turbine blade vibration on separation and transition at low Reynolds number
Numerical simulation methods were used to compare and analyze the effects of low-pressure turbine blade vibration at different frequencies on the separation and transition of suction surface boundary layer and flow losses at low Reynolds number(Re=25 000),with its aim of exploring the influence mechanism of low-pressure turbine blade vibration on separation and transition.The research showed that the relative motion between the fluid and the blade due to the blade vibration made the separation flow meet the main flow in advance.The advanced transition caused by this was able to limit the development of the separation bubble,reduce the size of the separation bubble and weaken the backflow mixing inside the separation bubble.The blade vibration thinned the boundary layer,weakened the flow blockage and wake mixing near the trailing edge and substantially lowered the turbulent pulsation level in the separation and transition process.Furthermore,the impacts above reduced the total pressure loss up to 23.02％,and improved the aerodynamic performance significantly.
blade vibrationlow-pressure turbine bladeseparationtransitionaerodynamic loss
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