| Citation: | SU Yinyou, TANG Zhili, TIAN Jinhu, et al. Research on aerodynamic optimization design of low-pressure turbine cascades at low Reynolds numbers environments[J]. Journal of Aerospace Power, 2026, 41（X）：20250605 doi: 10.13224/j.cnki.jasp.20250605
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To ensure stable operation of the low-pressure turbine under low-Reynolds-number conditions, numerical simulation and experimental methods were adopted to analyze the operating characteristics of the low-pressure turbine cascade with respect to influencing factors including Reynolds number, load coefficient, incoming flow reduced frequency, and turbulence intensity, and further carry out optimal design adapted to the low-Reynolds-number working environment. The results showed that with the decrease in Reynolds number, the influence of reduced frequency increased; when the Reynolds number was 1.0×104, the reduced frequency increased from 1.03 to 3.09, leading to a 0.9% reduction in efficiency and a 6.0% increase in loss. The optimized cascade scheme reduced the adverse pressure gradient downstream of the throat on the blade suction surface, effectively suppressed the separated flow under low-Reynolds-number conditions, and thus significantly improved the performance of the turbine cascade. Under low-Reynolds-number conditions, there was no airflow separation on the suction surface of the optimized cascade, and the pressure and energy losses were reduced by 30%—40%; no improvement was observed under high-Reynolds-number conditions. Within the range of incoming flow angle of attack from −20° to 10°, the pressure and energy losses increased by 5%—25%, while the losses remained nearly the same when the angle of attack was between −10° and 0°.
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