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heat shield and a muffler. The muffler is inside the heat shield. A felt metal
liner is installed on the inside surface of the muffler for noise reduction. At
the forward end ,the heat shield has a drip pan and is supported by the
engine shroud. There si a gap between the muffler and the APU engine
exhaust. At the aft end ,the exhaust duct is supported by the aft fairing .
APU 排放口引导发动机排出气体到外面并降低高速气流的噪音。排放
管道包括一个加热保护罩和一个消音器。消音器安装于加热保护罩内
部。一个绝缘金属垫片消音器内表面上，用来降低噪音。在加热器前
端有一个集油盘并被发动机保护罩支持。在消音器与APU 发动机排
气口之间有一个间隙。排气管道后端由后整流罩支撑。
LESSON 19 AUXILIARY POWER UNIT （2）
一、单词
首先Primarily 供给Furnish 接线端teminal
中线Neutral 导线Lead 在…外面Outside
放电器Discharger 开缝的slotted 频率Frequency
得到Achieve 跳开关Breaker 闭合Closing
松开Tripping 永久磁铁Permanent
magnet
帮助Assist
锁定Latch 弹簧Spring 保持hold
触点Contact 接触器Contactor 信号Signal
获得Gain 应用Application 允许Allow
短暂的Momentary 通电Energize 线圈Coil
极性polarity 插座Receptacle 汇流条防护Bus protection
panel
充电器Charger 主要的Essential 缺席Absence
柱螺栓stud
二、TEXT
(1) the APU driven generator is mounted on the foreard face of the APU
accessory drive gearbox. The APU generator produces the AC power
required by the airplane systems primarily for ground operation, the
generator can also be used as a backup generator in flight. APU is used to
furnish 60 KVA of electrical power on the ground and used as AC power
source of 50 KVA in flight.
APU 驱动的发电机安装在APU 附件齿轮箱前表面上。APU 发电机可
产生飞机在地面操作时系统所需基本交流电，此发电机同时也可做为
飞行中的备用电源。APU 被用来在地面提供60 千伏安的电源及飞行
中提供50 千伏安的交流电源。
(2) The APU ac generator has 6 ac terminals:
T1,T2,and T3 are the power terminals, T4,T5 and T6 are the neutral or
ground terminals.
T1 and T4 are for phase A, the leads are color-coded red.
T2 and T5 are for phase C, the leads are color-coded blue.
T3 and T6 are for phase B, the leads are color-coded yellow.
These terminal numbering and color-coding is the same as for the engine
–driven generators. Cooling air enters through a duct from outside the
APU compartment, passes through the generator and discharges into the
APU. The generator is attached to the APU accessory drive gearbox with
12 slotted holes over mounting studs. The neutral current transformer
sense the total current flowing through the APU generator at the neutral
terminal.
APU 发电机有六个交流接线端：
T1，T2 和T3 是电源接线端，T4，T5 和T6 是中线或地面接线端。
T1 和T4 为A 相，导线颜色为红色。
T2 和T5 为C 相，导线颜色为蓝色。
T3 和T6 为B 相，导线颜色为黄色。
这些接线端号码及颜色代码与发动机驱动的发电机是相同的。冷却空
气通过一个APU 外面的管道进来，通过发电机和排气装置进入APU。
发电机被放在APU 附件驱动齿轮箱上，用12 个双头螺栓固定。中线
电流转换感受流过APU 发电机中线接线端的总的电流。
(3) The ac power produced by APU generator is of constant frequency. To
achieve this, the APU generator drive( including a gearbox) can be used
for reducing the high speed of the APU engine to a lower speed. The APU
engine drive the generator in lower speed to produce ac power at constant
frequency.
APU 发电机产生的交流电源是恒频的。为得到恒频电源，APU 驱动
发电机可将APU 发动机高速度降成低速使用。APU 发动机以低速驱
动发电机，从而产生恒频的交流电。
(4) The two APU generator breakers( see figure 19-2) connect 115 volt ac,
400 hertz, 3-phase power to the distribution system from the APU
generator. The APU generator breakers are located in the bottom of the P6
panel in the flight compartment. The breaker has a dc coil for closing and
tripping. A permanent magnet assists closing and latches the breaker in the
closed position. An internal spring assists opening and holds it in the open
position. The breaker has 6 main 115 volt ac contacts and 20 auxiliary
contacts. The auxiliary contacts are used to control the positions of APU
generator breakers and external power contactors, and for indicating lights
in the flights in the flight compartment. The closing and tripping signals
for the breakers are from the P5-4 panel. The breaker conacts position is
indicated by the blue APU GEN OFF BUS light on the P5-4 panel. Access
to the breaker is gained by opening circuit breaker panerls p6-11 and
P6-12 at the bottom of P6 panel.
两中APU 发电机跳开关将115 伏，400HZ 的三相交流电连接到APU
发电机的分配系统。APU 发电机跳开关安装在驾驶舱P6 面板的低部。
跳开关有一个打开/闭合用的直流线圈。一个永久磁铁帮助跳开关闭合
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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航空工程英语基础（中英文对照）(99)
