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• W4385223019 abstract "In this work, time-resolved quantitative light sheet technique is used to capture the transient outflow performances of the laminated cooling in turbine vane leading edges. A series of numerical simulations are performed to deeply understand the intrinsic flow and heat transfer mechanisms. Two laminated structures are compared, one is a traditional design with uniform hole-diameter (UD), and the other contains non-uniform hole-diameters (NUD) with locally-enlarged film and impingement holes on pressure side. Time-averaged results show that NUD can obtain a higher film effectiveness and a better film coverage due to the decreased momentum of cooling air-jet, and the relative improvement from UD can achieve 58.7%. The unsteadiness analysis of transient film is conducted by quantifying the standard deviation of instantaneous data, and it shows that the fluctuation of cooling air-jet mainly originates from Kelvin-Helmholtz instability at mainstream/coolant interfaces and separation vortex. The new design of NUD can also obtain a low near-wall unsteadiness level, because the separation vortex disappears on target surface, which implies a lower risk of thermal damage. Moreover, the mass flow rate of cooling air is an important factor on transient film performance, which can aggravate the separation of cooling air-jet and cause a higher unsteadiness level." @default.
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• W4385223019 date "2023-10-01" @default.
• W4385223019 modified "2023-10-09" @default.
• W4385223019 title "Transient film outflow performances of laminated cooling configurations in leading edges of turbine vane" @default.
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• W4385223019 doi "https://doi.org/10.1016/j.applthermaleng.2023.121209" @default.
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