| Citation: | SHI Lei, ZHENG Yuxiang, FANG Wenbo, et al. Flow characteristics of leading edge erosion subsonic airfoil under low Reynolds number condition[J]. Journal of Aerospace Power, 2025, 40（12）：20240728 doi: 10.13224/j.cnki.jasp.20240728
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Taking the subsonic airfoil of a turbofan engine fan blade as the research object, numerical simulation of the original airfoil and two leading edge erosion airfoils at five atmospheric heights was carried out with reference to the Committee on Extension to the Standard Atmosphere (COESA) standard atmospheric model, so as to explore the influence of leading edge erosion on the flow characteristics of subsonic cascade in high altitude and low Reynolds number environment. The results showed that at 0° angle of attack, the low Reynolds number condition weakened the sensitivity of the airflow to the leading edge morphology, so that the pressure distribution at the leading edge, the flow separation and transition of the boundary layer on the suction surface, and the separation degree of the trailing edge of the three airfoils tended to be consistent. Finally, the increase of total pressure loss caused by the leading edge erosion became smaller with the decrease of Reynolds number, and the total pressure loss coefficient and pressure ratio of the three airfoils tended to be consistent. At the angle of attack of 4°, the leading edge erosion can promote the occurrence of transition at low Reynolds number and reduce the degree of trailing edge separation, so that the total pressure loss was less than 0° angle of attack; when the inlet Mach number was 0.6, it reduced by 23.6%, and when 0.8, it reduced by 41.2%.
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