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through the inner portion of the fan rotor, then continues through the booster, the
core engine and the LPT, exiting through the core exhaust nozzle. The secondary
airflow passes through the fan outer portion and exits through the fan discharge
duct(fan air ). The fan is located on the front of the engine, the main function of the
fan is to accelerate the air directed to the engine secondary airflow nozzle. This
results in producing approximately 78% of the total engine thrust.
[5] Fuel is delivered to the fuel nozzles at pressure and flow-rate required to obtain
the desired engine thrust. Fuel is pumped from the fuel tank and enters through the
engine fuel shutoff valve. The engine fuel shutoff valve is controlled by the engine
start lever and the engine fire warning switch. When the engine fuel shutoff valve is
closed, the FUEL VALVE CLOSED light located on the forward overhead panel
illuminates dim.
Fig 16-2 Engine Fuel and oil system schematic
[6] Fuel passes from the first stage of the engine driven fuel pump through a fuel/oil
heat exchanger to a filter. provisions are made to bypass the filter in the event of
failure or blockage. The second stage of the fuel pump provides high pressure fuel
to the main engine control (MEC). As the fuel leaves the second stage fuel pump, it
passes through another filter where a portion of the fuel is ported to a servo fuel
heater before entering the MEC. The servo fuel heater uses engine oil to heat the
servo fuel to prevent icing of control mechanisms internal to the MEC. The MEC in
conjunction with the power management control (PMC) uses power lever angle, fan
inlet pressure and temperature, N1 rpm and N2 rpm to meter the correct amount of
fuel to the combustor. A fuel-flow transmitter measures the rate of fuel flow from
the MEC and provide a signal to the fuel flow indicator.
[7] The oil system is pressurized by the engine driven oil pump. The oil leaves the
oil pump, where sensors for oil pressure and the LOW OIL PRESSURE switch are
located, passes through an oil filter and continues to the engine bearing and gearbox.
The oil is returned to the oil tank by means of engine driven scavenge pump. From
the scavenge pumps the oil passes through a scavenge filter, bypass valve is
mounted to prevent filter from blocking .Scavenge oil temperature is sensed as the
oil returns to the scavenge pump. The oil then passes through the servo fuel heater
and fuel/oil heat exchanger where it is cooled by fuel before returning to the oil
tank.
EXERCISE
A. Find out the explanations of the following words in your “English-Chinese
technical diction any”
1. thrust [ P1-155 ]
2. turbofan [ P1-162 ]
3. rotor [ P1-128 ]
4. compressor [ P1-33 ]
5. turbine [ P1-162 ]
6. bearing [ P1-18 ]
7. nozzle [ P1-107 ]
8. illuminate [ P1-79 ]
9. dim [ P1-44 ]
10. heat exchanger [ P1-74 ]
11. main engine control [ P1-97 ]
12. meter [ P1-100 ]
13. indicator [ P1-79 ]
14. scavenge [ P1-130 ]
15. bypass valve [ P1-25 ]
B. Translate the following sentences into Chinese.
1. The engine is an axial flow turbofan with two rotors and variable stator vanes.
The single-stage fan and three-stage low pressure compressor are driven, via the
low -speed (N1) shaft, by a 4-stage low pressure turbine.
2. The engine is capable of producing approximately 18,500 to 23,500 pounds of
thrust at sea level static condition.
3. The fan and booster is a maintenance module of the fan major module, the fan
and booster provide 2 separate air flow ,the primary airflow passes through the
inner portion of the fan rotor and exits through the core exhaust nozzle ,the
secondary airflow passes through the fan outer portion and exits through the fan
discharge duct.
4. Fuel passes from the first stage of the engine driven fuel pump through a fuel/oil
heat exchanger to a filter.
5. The MEC ( Main Engine Control ) in conjunction with the power management
control ( PMC ) uses power lever angle, fan inlet pressure and temperature, N1
rpm and N2 rpm to meter the correct amount of fuel to the combustor.
LESSON 17
POWER PLANT (2)
VOCABULARY
1. start [ sta:t ] n.; v. 起動; 啟動
2. ignition [ ignin ] n. 點火; 起爆
3. torque [ t : k ] n. ;v. 扭矩; 扭轉(zhuǎn)
4. rotate [ ruteit ] v. 轉(zhuǎn)動; 旋轉(zhuǎn)
5. accelerate [ ækselreit ] v. 加速
6. idle [ aidl ] n. ; a. 慢車; 慢速的
7. starter [ sta:t ] n. 起動器
8. circuitry [ s:kitri ] n. 整套電路; 一套電路
9. HPC = High Pressure Compressor 高壓壓縮(氣)機
10. case [ keis ] n. 外殼; 封閉罩
　
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