To reduce the difficulty of aerodynamic design in air-cooled turbine

a set of calculation ideas based on multi-stage air-cooled turbine were presented in consideration of the cooling air mixing

warped S1 stream surface and variable thickness along with flow passage; the parameterization method program and automatic mesh generation program of warped S1 stream surface slice with cooling condition were prepared

and the traditional plane slice was modified. Comparative analysis of the difference among the modified plane slice

warped S1 stream surface slice and three-dimensional calculation was made

and aerodynamic design of a high-pressure turbine with warped S1 stream surface slice was optimized. The results show that: in comparison with three-dimensional calculation

the maximum gap of mass flow in modified plane slice is up to 22.68%

and 3.58% in warped S1 stream surface slice; the warped S1 stream surface slice is closer to three-dimensional calculation on one-dimensional data; blade pressure and Mach number contour distribution of warped S1 stream surface slice are closer to three-dimensional calculation than that of modified plane slice. After aerodynamic optimization in warped S1 stream surface slice

compared with original model

the stage efficiency has been increased by 0.41%

while mass flow has only been increased by 0.21%.