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并通過它進(jìn)行檢查、維護(hù)或拆裝工作。通過組件下方用一個簡單的吊
架和線纜系統(tǒng)完成拆卸。
APU 是一個單軸氣動渦輪發(fā)動機(jī)，它有一個兩級離心壓氣機(jī)，一個單
燃燒室和一個徑向內(nèi)流式渦輪。由齒輪箱驅(qū)動的附件組位于組件前
面。
(3) The APU fuel system consist of a fuel valve, control unit, solenoid valve, f
ilter, heater and control valve. The fuel valve allows fuel supply from the
tank to the APU engine. This valve operation is controlled by the APU
switch on P5 panel, is it opened by placing the APU switch to the ON
postion and closed by the switch placed to the OFF position. The valve
can be operated manually without power by the override handle. The
control unit regulates the fuel flow to the combustion chamber, during
starting and normal operation. The solenoid valve allows fuel flow to the
combustion chamber after the initial rotation of the APU. The two fuel
filters are used to prevent contamination of the pump and fuel control unit.
The fuel heater is used to prevent ice from blocking the fuel filter.
APU 燃油系統(tǒng)包括一個燃油活門、控制組件、電磁活門油濾、加熱器
及控制活門。燃油活門允許燃油從燃油箱提供給APU 發(fā)動機(jī)。此活
門是通過P5 板上的APU 開關(guān)操作的，當(dāng)APU 開關(guān)置于ON 位時打
開，置于OFF 位時關(guān)閉。此開關(guān)在沒有電源情況下可通過超控手柄
進(jìn)行人工操作。控制組件用來在起動及正常操作期間調(diào)節(jié)流進(jìn)燃燒室
的燃油量。電磁開關(guān)允許燃油當(dāng)APU 初始轉(zhuǎn)動后流向燃燒室。兩個
油濾用來防止污染泵及燃油控制組件。燃油加熱器用來防止燃油結(jié)冰
堵塞燃油油濾。
(4) The fuel from the tank is delivered to the fuel control unit through the fuel
valve. The fuel control unit supplies and regulates the fuel to the
combustion chamber. The regulated fuel flow controls the acceleration of
the APU engine during the starting operation.When a load is applied to
the APU, the fuel control unit meters the fuel flow to maintain a near
constant speed and a safe operating temperature of the unit.
燃油箱中的燃油通過燃油活門被送到燃油控制組件。燃油控制組件對
進(jìn)入燃燒室的燃油進(jìn)行調(diào)節(jié)。調(diào)節(jié)燃油量可對APU 發(fā)動機(jī)起動時的
加速進(jìn)行控制。當(dāng)一個負(fù)載被加到APU 上時，燃油控制組件測量燃
油量以保持一個相近的恒定速度及組件的安全溫度。
(5) The APU ignition and starting system provides the means of rotating the
APU engine to starting speed and for igniting the fuel-air mixture in the
combustion chamber. This system consists of a start switch, starter, start
relay, ignition exciter, igniter plug, and control circuit. The starter provides
initial power for rotatin the APU engine compressor, tubine, and engine
–driven accessories to a speed high enough to obtain good airflow for
combustion. The ignition exciter provides the high voltage required to
produce the spark at the ignitor plug, the ignition exciter electrical
components are enclosed in a hermetically sealed metal container. The
igniter plug is installed on the forward side of the combustion chamber, it
is used to provide the high energy spark for igniting the fuel/air mixture.
APU 點(diǎn)火及起動系統(tǒng)提供APU 發(fā)動機(jī)起動速度時的轉(zhuǎn)動及點(diǎn)燃燃燒
室中的油氣混合物。這系統(tǒng)包括一個起動開關(guān)、起動器、起動繼電器、
點(diǎn)火勵磁器、點(diǎn)火器插頭及控制電路。起動器為APU 發(fā)動機(jī)壓氣機(jī)、
渦輪及發(fā)動機(jī)驅(qū)動附件到足夠高的速度以得到燃燒所需的氣流轉(zhuǎn)動
提供初始動力。點(diǎn)火勵磁器為在點(diǎn)火器插頭上產(chǎn)生火花提供高壓電
能，點(diǎn)火勵磁器電子組件被封入一個密封地金屬容器內(nèi)。點(diǎn)火插頭被
安裝在燃燒室的前面，被用來提供點(diǎn)燃油氣混合物的高能花火。
(6) The start system interfaces with the sequencing oil pressure switch, speed
switch, APU control unit and APU switch. During APU start, the starter is
energized and APU rotates. The ignition exciter is energized by the action
of the sequencing oil pressure switch(this switch ensures that combustion
cannot be initiated during an APU start until a minimum lubricating oil
pressure has been buildup during APU start, with increasing oil pressure,
this switch closes at 4 psig oil pressure and provides 28 volt dc power to
the fuel solenoid valve and the ignition exciter). The starter and ignition
circuits are de-energized by the action of the speed switch during APU
engine acceleration. During normal engine operation, the exciter remains
de-energized.
起動系統(tǒng)連接著程序化的滑油壓力開關(guān)、速度開關(guān)、APU 控制組件及
APU 開關(guān)。APU 起動期間，起動器被接通，APU 轉(zhuǎn)動。點(diǎn)火勵磁器
通過程序化的滑油壓力開關(guān)（此開關(guān)確保在APU 起動到建立最小的
滑油潤滑壓力期間不會燃燒。在APU 起動期間，隨著滑油壓力增加，
當(dāng)滑油壓力達(dá)到4PSIG 時，開關(guān)關(guān)閉，并且提供28 伏直流電給燃油
電磁活門及點(diǎn)火勵磁器）動作被接通。起動器及點(diǎn)火線圈在APU 發(fā)
動機(jī)加速期間通過速度開關(guān)被釋放。在發(fā)動機(jī)正常操作期間，勵磁器
保持?jǐn)嚅_。
(7) The APU exhaust conducts the engine exhaust gas overboard and reduces
the noise level of the high velocity gas flow. The exhaust duct consists of a
　
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