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(2) The engine starter is a single-stage, axial flow, turbine-air motor, the
starter converts compressed air pressure into rotational mechanical energy
sufficient to accelerate the engine to starting speed. Pressurized air and
electrical power are required for starter operation. The engine may be
started with air from the APU(we will introduce APU in the next lesson),
from a ground source, or by using engine crossbleed. Another important
system related to engine operation is the ignition system. The purpose of
the ignition system is to produce a high current electrical spark to ignite
the fuel /air mixture in the engine combustion chamber during starting and
to provide continuons ignition during takeoff, landing and operation in
adverse weather conditions. The ignition system consists of the ignition
power supply, engine ignition control, 2 ignition exciters, 2 spark igniters
and 2 triaxial shielded ignition leads.
發動機起動器是一個單級、軸流式空氣渦輪發動機，起動器將壓縮空
氣的壓力轉換為足夠的轉動機械能以加速發動機的轉速。起動操作時
需要增壓空氣及電源。發動機可以用APU 來的引氣、地面氣源或發
動機交輸引氣起動（我們將在下一課介紹APU）。另一個與發動機起
動有關的重要系統是點火系統。點火系統的作用是在起動過程中產生
高壓電火花點燃發動機燃燒室中的燃油/空氣的混合氣，并在起飛、降
落階段及惡劣天氣下提供持續的點火。點火系統包括點火電源、發動
機點火控制、2 個點火勵磁器、2 個火花點火器及2 個三相點火屏蔽
線。
(3) Bleed air is extracted from the high pressure compressor for the following
system:
Air-conditioning
Cabin pressurizatin
Wing and engine inlet cowl anti-icing
Hydraulic tank pressurization
Potable water tank pressurization
Fan air is used as cooling air for the precooler to limit the temperature of the
bleed air in the pneumatic manifold. Fan air is also used for cooling the
generator and thrust reverser.
引氣從高壓壓氣機中釋放給列鐐系統：
空調系統
客艙增壓系統
機翼及發動機入口整流罩防冰
液壓油箱增壓
飲用水箱增壓
風扇空氣做為預冷器中的冷卻空氣用以限制增壓總管中的引氣溫度。風
扇空氣也可用于冷卻發電機和反推裝置。
(4) The thrust reverser system reversers the direction of the fan exhaust during
landing and provides additional brakeing of the airplane. The reverser
sleeve is part of the engine cowling . the actuating system is on the
reverser. The control and indicatin system are located remote from the
engine. The reverser can only be deployed on the ground with hydraulic
pressure available. Prior to deployment the engine thrust lever must be at
idle position.
In figure17-1,10blocker doors are arranged around the forward section of
the thrust reverser sleeve. The forward section of the blocker door is
attached to the sleeve with two bolts, the blocker door drag link attaches
the blocker door to the inner duct. The ddrag link attaches to the blocker
door with a link attachment fittin and to the inner duct with a bolt. As the
sleeve translate aft, the blocker doors rotate into a blocking position, due
to sleeve movement and the door’s attachment to the inner duct.When
extended, the blocker doors block the fan exhaust, forcing air in the
reverse direction through the cascade segments.When retracted, the doors
form part of the outer duct for fan exhaust air.
反推裝置系統將降落階段風扇排放的氣流反向并輔助飛機剎車。反推
器的外殼是發動機整流罩的要部分。作動系統在反推器上。控制及指
示系統從發動機遙控。反推器只能夠在地面液壓系統有效時打開。在
打開之前，發動機反推裝置必須是在慢車位。
在圖17-1 里，10 個阻流門圍繞著反推裝置外殼前部排列。阻流門前
段用兩個螺栓與外殼相連，阻流門阻力連桿將阻流門連接在內部管道
上。阻力連桿用一個連接裝置連接到阻流門并用一個螺栓連接到內部
管道上。當外殼移動后部，阻流門轉到阻流位，由于外殼轉動，并且
門連接在內部管道。當擴展時，阻流門阻止風扇排氣，迫使空氣反向
通過級聯段。當收回時，阻流門將作為風扇向外排氣的外部管道的一
部份。
(5) The engine and hydraulic parameters are displayed on two engine
instrument panel(ELS)using light emitting diodes(LED).
Engine displays and controls on the center panel consist of the following :
·N1 displays—— indicate fan speed in percent rpm.
·N2 displays —indicate high pressure compressor speed in percent rpm .
·Exhaust gas temperature(EGT)displays
1. indicate temperature of exhaust gas in °C.
2. a red light above each N1,N2,and EGT display illuminates if that engine
exceed its redline.
·Fuel flow displays
Indicate fuel flow in weight of fuel per hour and also total fuel consumed per
engine.
The FUEL FLOW/FUEL USED switch is used to change display from FUEL
FLOWto FUEL USED, after 10 seconds the FUEL USED display reverts to
　
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