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21. airstream [ stri:m ] n. 氣流
22. combustion [ kmbstn ] n. 燃燒
23. annular [ ænjul ] a. 環(huán)形的;園環(huán)狀的
24. increase [ inkri:s ] v. 增大(加,強(qiáng)); 提高
25. discharge air 排氣
26. is capable of + ing 能夠… ; 可以…
27. approximately [  pr ksimitli ] ad. 大約; 近似地
28. major [meid  ] a. 主要的
29. module [ m dju:l ] n. 組件
30. core [ k : ] n. 核心;主體
31. accessory gearbox 附件齒輪箱
32. maintenance [meintinns ] 維護(hù)
33. booster [bu:st ] 助推器(加速,增壓)
34. bearing support [bri ] [ s p :t ] 軸承支座
35. inlet [inlet ] n. 入口
36. frame [ freim ] n. 支架;構(gòu)架; 骨架
37. nozzle [n zl ] n. 噴咀; 噴管
38. shroud [ raud ] n. 防護(hù)罩
39. transfer [trænsf: ] v. ; n. 轉(zhuǎn)換;傳動
40. continue [ kn tinju: ] v. 繼續(xù)
41. accelerate [ ækselreit ] v. 加速
42. direct [ direkt ] v. 引導(dǎo);引向
43. result [ rizlt ] n. 結(jié)果. result in 結(jié)果是
44. deliver [ diliv ] vt. 交付;傳送;供應(yīng)
45. pump [ pmp ] v. 用泵抽
46. shutoff valve [ t :f ] [ vælv ] 截流閥; 斷油活門
47. start lever [ sta:t ] [lev ] 起動手柄
48. warning [w :ni ] n. 警告;警報(bào)
49. overhead [uvhed ] a. 頭頂上方的; 過頂?shù)?br /> 50. illuminate [ ilju:mineit ] vt. 照亮
51. dim [ dim ] a. 暗淡的
52. heat exchanger [ iksteind  ] 熱交換器
53. filter [filt ] n. 過濾器
54. failure [feilj ] n. 失敗; 故障
55. blockage [bl kid ] n. 堵塞
56. MEC = Main Engine Control 主發(fā)動機(jī)控制器
57. leave [ li:v ] v. 離開;脫離
58. is ported to 轉(zhuǎn)入
59. mechanism [ me knizm ] n. 機(jī)械(結(jié)構(gòu);裝置)
60. in conjunction with 和…一起
61. RPM = revolutions per minute 轉(zhuǎn)/分;每分鐘轉(zhuǎn)數(shù)
62. meter [mi:t ] v. 測量;量度
63. transmitter [ trænzmit ] n. 發(fā)射機(jī); 傳感器
64. measure [me  ] n. 測量
65. indicator [indikeit ] n. 指示器
66. scavenge [skævind ] v. 回油
67. bypass valve 旁通活門
TEXT
[1] The power plant on the 737-300/400/500 provides the thrust required for flight
and also supplies power to aid in stopping the airplane (thrust reversers), provides
bleed air for air conditioning, pressurization, anti-icing, and drives a gearbox used
for electrical power and hydraulic power. The 737 airplane are powered by two
wing-mounted CFM 56-3 high bypass- ratio turbofan engine, the engine buildup is
identical for left or right engines.
[2] The engine is an axial flow turbofan with two rotors and variable stator vanes.
The single-stage fan and three-stage low pressure compressor (LPC) are driven, via
the low-speed (N1)shaft, by a four-stage low pressure turbine (LPT). The nine stage
high pressure compressor (HPC) is driven, via the high speed (N2) shaft, by a single
stage high pressure turbine (HPT). The two rotors are mechanically independent of
each other. Air entering the engine is divided into a primary (inner) and a secondary
(outer) airstream. After the primary airstream has been compressed by the LPC and
HPC, combustion of fuel in the annular combustion chamber increases the HPC
discharge air velocity to drive the high and low pressure turbines. The engine is
capable of producing approximately 18,500 to 23 ,500 pounds of thrust at sea level
static condition.
[3] The engine consist of 4 major modules: fan, core, low pressure turbine and
accessory gearbox
Fig 16-1 Engine major components
VBV = Variable Bleed Valve
VSV = Variable Stator Vane
IGV = Inlet Guide Vane
The fan major module consists of 4 maintenance modules ,they are fan and booster,
No.1 and No.2 bearing support, inlet gearbox No.3 bearing and fan frame. The core
major module consist of 8 maintenance modules, they are high pressure compressor
( HPC) rotor, HPC front stator, HPC rear stator, combustion outer case, combustion
chamber , high pressure turbine ( HPT) nozzle, HPT rotor, HPT shroud and
1st-stage LPT nozzle. The low pressure turbine module consists of 3 maintenance
modules ,they are low pressure turbine, low pressure turbine shaft and turbine frame.
The accessory drive module consists of 2 maintenance modules ,they are the
transfer gear box and the accessory gearbox .
[4] The fan and booster provide two separate air stream, the primary airflow passes
　
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