关于发动机的高压级引气活门

航线昌昌 · 发表于 2013-11-2 16:09:33

请教：为何发动机启动时，慢车位，低转速时用的是高压级引气活门，是因为功率小，IP不够吗？如果HPV失效了，则用IP引气，有何后果？启动慢？

hjkl · 发表于 2013-11-2 16:56:18

This sub-system enables the selection of the HP compressor stage from which air is to be bled. It includes two main components:
-    the HP bleed valve

-    the IP bleed check valve.

This sub-system bleeds the air from the intermediate or higher stages of the compressor depending on the available pressure and engine speeds as follows:
-    in the normal engine air bleed configuration,the air is bled from the compressor IP port(intermediate pressure,on the 8th stage) at high engine speed

-    at low engine speed,especially during aircraft descent,with engines at idle, the IP port pressure is insufficient. The air is automatically bled from the HP port (high pressure on the 15th stage) through the HP bleed valve and the pressure downstream of this valve causes the IP bleed check valves to close.

When the IP port pressure exceeds the HP bleed valve target value, the HP bleed valve closes. Air bleed transfer from the HP port to the IP port is pneumatically achieved,air is directly bled from the IP stage through the IP bleed check valves.
There are three cases of pneumatic operation:
-    HP stage pressure lower than 40 psig (average value):
Air is bled from the HP port through the HP bleed valve which is fully open. The IP bleed check valves are closed to prevent any air recirculation through the engine.

-    HP stage pressure higher than 40 psig and lower than 185 psig, and IP stage pressure lower than 40 psig:
Air is bled from the HP port through the HP bleed valve which regulates the downstream pressure at 40 psig. The IP bleed check valves are closed to prevent any air recirculation.

-    IP stage pressure higher than 40 psig:
If the solenoid of the HP bleed valve is not energized, air bleed transfer from the HP port to the IP port is pneumatically achieved. The IP bleed check valves are open.

NOTE: Transfer to the IP stage can be forced by closing the HP bleed valve via a solenoid incorporated in the valve. This transfer is commanded by the EEC (Electronic Engine Controller) of the corresponding engine.
A reverse flow protection is ensured by the IP bleed check valve and the HP bleed valve which close when the downstream pressure is higher or equal than the upstream pressure.
QQ截图20131102165626.png

tigerzhangxj · 发表于 2013-11-2 18:02:58

好资料啊谢谢分享

航线昌昌 · 发表于 2013-11-2 18:08:30

hjkl:This sub-system enables the selection of the HP compressor stage from which air is to be bled. It includes two main components:
- the HP bleed valve

- the IP bleed check valve.

....... (2013-11-02 16:56)

手册我已看过，兄弟，如果HPV锁死在关位，有何后果？

jo1o7361 · 发表于 2013-11-2 20:49:17

不能放行呗

ZHAOHUI304 · 发表于 2013-11-2 21:09:03

好资料啊谢谢分享

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