時(shí)間：2011-06-14 21:26來(lái)源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次
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(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(gè)燃油活門(mén)、控制組件、電磁活門(mén)油濾、加熱器及控制活門(mén)。燃油活門(mén)允許燃油從燃油箱提供給 APU發(fā)動(dòng)機(jī)。此活門(mén)是通過(guò) P5板上的 APU開(kāi)關(guān)操作的，當(dāng) APU開(kāi)關(guān)置于 ON位時(shí)打開(kāi)，置于 OFF位時(shí)關(guān)閉。此開(kāi)關(guān)在沒(méi)有電源情況下可通過(guò)超控手柄進(jìn)行人工操作�？刂平M件用來(lái)在起動(dòng)及正常操作期間調(diào)節(jié)流進(jìn)燃燒室的燃油量。電磁開(kāi)關(guān)允許燃油當(dāng) APU初始轉(zhuǎn)動(dòng)后流向燃燒室。兩個(gè)油濾用來(lái)防止污染泵及燃油控制組件。燃油加熱器用來(lái)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(guò)燃油活門(mén)被送到燃油控制組件。燃油控制組件對(duì)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(duì) APU發(fā)動(dòng)機(jī)起動(dòng)時(shí)的加速進(jìn)行控制。當(dāng)一個(gè)負(fù)載被加到 APU上時(shí)，燃油控制組件測(cè)量燃油量以保持一個(gè)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(dòng)系統(tǒng)提供 APU發(fā)動(dòng)機(jī)起動(dòng)速度時(shí)的轉(zhuǎn)動(dòng)及點(diǎn)燃燃燒室中的油氣混合物。這系統(tǒng)包括一個(gè)起動(dòng)開(kāi)關(guān)、起動(dòng)器、起動(dòng)繼電器、點(diǎn)火勵(lì)磁器、點(diǎn)火器插頭及控制電路。起動(dòng)器為 APU發(fā)動(dòng)機(jī)壓氣機(jī)、渦輪及發(fā)動(dòng)機(jī)驅(qū)動(dòng)附件到足夠高的速度以得到燃燒所需的氣流轉(zhuǎn)動(dòng)提供初始動(dòng)力。點(diǎn)火勵(lì)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(lì)磁器電子組件被封入一個(gè)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(lái)提供點(diǎn)燃油氣混合物的高能花火。 |
