| Citation: | Chen Haoqian, Sui Xiuming, Pu Jian, et al. A numerical study of the tapered-land cutback cooling structure effects on shock and wake losses of transonic turbine blade[J]. Journal of Aerospace Power, 2026, 41（7）：20240677 doi: 10.13224/j.cnki.jasp.20240677
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Shock and wake losses are the main sources of aerodynamic losses of a highly-loaded transonic air-cooled turbine blade. Pressure-side cutback cooling can control aerodynamic losses while reducing trailing-edge thermal load, but the relationship between the structural features and the losses remains unclear. In this study, a land structure with a tapered end was constructed, and steady-state numerical calculations were performed to investigate the effect of the tapered-land cutback structure on the shock and wake losses in a transonic turbine blade. The results showed that, for the shock loss, the tapered-land cutback structure induced an earlier flow acceleration and deflection via upstream flow area expansion, thereby mitigating the pre-shock expansion on the pressure side. Therefore, the Mach number and the shock angle were reduced and the losses of the pressure-side shock wave and the reflected shock wave decreased. For the wake loss, the tapered-land cutback structure effectively weakened the momentum transport between the mainstream and the coolant by increasing the base pressure downstream of the trailing edge and improving the uniformity of the velocity distribution. As a result, the wake was attenuated more rapidly along the flow direction and the wake loss decreased. The tapered-land cutback structure effectively reduced the energy loss coefficient over a wide range of the pressure ratio (exceeding 2.70) and the coolant flow rate (0%—3%) while also improving the trailing edge film cooling effectiveness.
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