哪位大神有介绍v2500发动机超速保护的相关资料

拼命前行

哪位大神有介绍v2500发动机超速保护的相关资料？求分享

ben8532

以下是從V2500 的訓練資料節錄,您也可以在AMM 找到這些訊息
FMU ‘Emergency’ Overspeed Protection
The Overspeed Valve is positioned down stream, in series, with the Fuel Metering Valve.
Note:
It should be understood that this device is not incorporated to provide the usual N1/N2 red line limiting of max TO speed of 100%.
The EEC will act through the Fuel Metering Valve to trim the fuel flow if N1 or N2 reach 100%.
Operation
The overspeed valve is spring loaded to the closed position, it is opened by increasing fuel pressure during engine start and during normal engine operation is always fully open.
In the event of an overspeed condition (>109% N1 or >105.7% N2 ) the EEC sends a signal to the overspeed valve torque motor which changes position and directs HP fuel to the top of the overspeed valve thus fully closing the valve.
A small by-pass flow is arranged around the overspeed valve to prevent engine flame out.
The overspeed valve is hydraulically latched in the closed position, thus preventing the engine from being accelerated.
The recommended procedure is for the flight crew to close the engine down, and not re-start.
Closing down the engine is the only way to release the hydraulic latching.
Note:
Because of the fact that the overspeed valve is spring loaded to the closed position, and opened by fuel pressure, the overspeed valve will close every time the engine is shut down.
The PRSOV will remain open due to the small amount of fuel that is allowed to flow by the shutoff vale
The microswitch gives valve positional feedback to the EEC.
FMU ‘Emergency’ Overspeed Protection
Should an ‘Emergency Overspeed’ condition be experienced and the engine has as a result exceeded 103% (either N1 or N2) the engine must be removed.

拼命前行

ben8532 发表于 2017-7-25 16:41
以下是從V2500 的訓練資料節錄,您也可以在AMM 找到這些訊息
FMU ‘Emergency’ Overspeed Protection
The O ...

谢谢，明白了一些，还需要进一步学习！