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[70-80 V2500] v2500第十级电磁活门控制放气活门的原理?

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发表于 2019-12-3 07:35:46 | 显示全部楼层 |阅读模式
求解答:v2500发动机高压压气机第十级电磁活门控制放气活门的原理?如果有知道的,还麻烦详细讲讲
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发表于 2019-12-3 18:33:03 来自手机 | 显示全部楼层
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中国民航飞行学院四川航空在线王

发表于 2019-12-4 11:01:16 | 显示全部楼层
A. HP Compressor Bleed Valves System
(1) General HP compressor bleed valves are required for stability of engine operation during starting and transient conditions. Three bleed valves for the seventh stage and one for the tenth stage of the HP compressor redirect a portion of HP compressor air into the fan stream.
(2) Description/Operation (Ref. Fig. 7th and 10th Stage Bleed Valves SHEET 1)  (Ref. Fig. 7th Stage Bleed Valves SHEET 1)  (Ref. Fig. Bleed Valves Operation SHEET 1)  (Ref. Fig. Bleed Valve Solenoid SHEET 1) 
(a) Bleed valves The bleed valves are mounted onto the outside of the HP compressor case. Each valve has a spring loaded open position. The piston has holes to permit a flow of air through the valve when it is open. When the valve is closed the piston is held against a plate which is part of the valve body. This shuts off the air bleed from the compressor. The piston is held in the open position by spring and compressor delivery (P3) pressures. When the P3 pressure is released by the controlling solenoid valve, the bleed valve is closed by compressor air pressure.
(b) Bleed valve solenoid valves Each air bleed valve has its own controlling solenoid valve which is installed on the fan case. The solenoid valve is connected to the bleed valve by a tube. This tube transmits P3 pressure to or from the bleed valve. The solenoid valve is controlled by electrical signals from the EEC through two separate coils.
With either or both of the solenoid coils energized, the service port is connected to vent. In this position the bleed valve is held closed.
With both solenoid coils de-energized the solenoid valve connects the engine supplied air to the service port holding the bleed valve open. The accessories which do the power distribution are divided into four groups: engine group I, engine group II, autostart group and reverser group.
7级和10级的原理是一样的,都是电磁阀上电放气活门关闭;电磁阀断电放气活门打开。

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