Main fan static blade angle issue
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When the main fan is operating safely. The motor operates at a stator blade angle of 25 degrees. When the main fan is shut down urgently, the stator vane angle is 58 degrees. The motor stops. Why does the stator vane angle become larger when the motor stops? Thank you
Apply emergency braking to bring the aircraft to a stop as quickly as possible
“When the main fan is shut down urgently, the stator vane angle is 58 degrees. The motor stops. ”It’s an abnormal phenomenon.
How do we formulate this self-protection plan?
This post was last edited by w77261670 on 2018-1-21 at 18:30. When an axial flow compressor is shut down urgently, the stator blades need to be adjusted to a minimum of 22°, while the anti-surge valves should be opened fully; this is essential to ensure a safe shutdown of the unit.
This post was last edited by dqkwb on 2018-1-23 22:46. The operating procedures for some of these devices are different. There are those that shut down with the stationary vanes in their fixed position, those that increase the angle of the stationary vanes to prevent excessive rotation speed, and those that reduce it to the minimum operating angle. Turning it down to the minimum operating angle helps prevent damage to the fan and also facilitates startup next time; locking it or turning it up is done to prevent the exhaust fan from coming off its mounting and speeding up, thereby avoiding damage to the equipment.