| Citation: | Li Lixin, Yin Zetian, Xiang Luyu, et al. Research on fuel cut-off sequence of overspeed protection system for turboshaft engines[J]. Journal of Aerospace Power, 2026, 41（9）：20240796 doi: 10.13224/j.cnki.jasp.20240796
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For evaluating the safety of Turboshaft engine power turbine over-speed protective device, the simulation test for over-speed was carried out on a specific type of Turboshaft engine under prescribed conditions and the fuel decay law of engine over-speed was obtained. Furthermore, a method for predicting maximum rotor speed after losing load was proposed. According to the relationship between the fuel flow decay law and output power, pneumatic torque, power turbine speed and acceleration, the power turbine speed at different moments during over-speed process was calculated by using sectional iterative calculation method. The maximum power turbine speed when shaft fracture occurs was obtained. Finally, a difference analysis was conducted on the highest speed post-shaft breakage of the over-speed protection devices equipped with different fuel cutoff timings. The results indicate that the duration of the stable decline phase during the fuel cutoff process plays a decisive role in the maximum speed of the power turbine speed of the power turbine. After adjusting the fuel cutoff time from 65 ms to 185 ms, the maximum power turbine speed rosed from 116.1% to 123.2%. To ensure the safety of the turbine after losing load, it is advisable to control the fuel cutoff time within 162 ms.
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