| HOU Li-zhen1，LIAO Ming-fu1，HUANG Wei2，WANG Si-ji1.Study of Fuse Mechanism Caused by Sudden unbalance[J].航空发动机,2021,47(5):41-46 |
| Study of Fuse Mechanism Caused by Sudden unbalance |
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| Key Words:fuse load reduction sudden unbalance critical speed aeroengine |
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| Abstract:In order to study the effect of the cone wall fuse of an aeroengine caused by sudden unbalance. The finite element model of
sudden unbalance speed nearby critical speed was established，the load reduction mechanism of cone wall fuse was analyzed，and the
steady-state analysis and transient calculation were completed.Through theoretical analysis，numerical simulation and experimental verifi?
cation，the correctness of load reduction mechanism is verified. The results show that the cone wall fusing technique can significantly re?
duce the unbalance response and external force of the rotor under sudden unbalance action. The mechanism of the cone wall fuse is that the
relative value between the critical speed and the blade off speed was changed because of the decrease of the support stiffness. The response
time of the fuse process and the support stiffness after the fuse are key parameters of fuse. The smaller the fuse support stiffness，the better
the load dropping effect，the shorter the fuse time，the better the load dropping effect. At the same time，the bearing stiffness of the rotor
should be reasonably designed so that the first and second critical speeds of the rotor can be far away from the speed of the windmill after
the cone wall is fused so as to avoid resonance. |
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