Abstract
An increase of turbine blade loading resulting in the downsizing and the decrease of weight of gas turbines can be achieved by the increase of blade turning angle. However, the aerodynamic performance of turbine cascade may be significantly deteriorated by the strengthened secondary flow. In this study, the oil-flow visualization and the blade surface static pressure measurements were performed for ultra-highly loaded linear turbine cascade with the turning angle of 160 degree in order to clarify the effects of the incidence angle and the tip-clearance on the secondary flow behavior. The present experimental results showed that the increase of incidence angle strengthens the horseshoe vortex and passage vortex, but not so influences the behavior of leakage vortex.
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