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LESSON 18
AUXILIARY POWER UNIT (1)
VOCABULARY
1. electrical [ ilektrikl ] a. 電的
2. completely [ km pli:tli ] ad. 完全地
3. enclose [ inkluz ] vt. 封入; 裝入
4. titanium [ tai teinim ] n. 鈦
5. inlet [ inlet ] n. 入口; 引入
6. entrance [ entrns ] n. 入口
7. split [ split ] v. 分開
8. path [ pæ ] n. 通路; 路徑
9. hole [ houl ] n. 孔; 洞
10. jet pipe [ d et ] [ paip ] 噴射管
11. pack [ pæk ] n. (空調)組件
12. readily [ 'redili ] ad. 容易地; 快速
13. accessible [ æksesbl ] a. 容易接近(達到)的
14. inspection [ in spekn ] n. 檢查; 檢驗
15. directly [ di rektli ] ad. 直接地
16. removal [ ri mu:vl ] n. 拆卸; 移開
17. simple [ simpl ] a. 簡單的
18. hoist [ h ist ] n. 吊車
19. cable [ keibl ] n. 鋼纜；電纜
20. centrifugal [ sentrifjugl ] a. 離心的; n. 離心機(力)
21. radial [reidil ] a. ; n. 徑向的; 徑向
22. inflow [inflou ] n. 流入; 內流(式)
23. solenoid [sulin id ] n. 電磁線圈
24. place [ pleis ] vt. 放置
25. override [ ouv raid ] v. ; n. 超控
26. regulate [ regjuleit ] vt. 調節; 管理
27. initial [ inil ] a. 最初的; 初始的
28. contamination [ kntæmi nein ] n. 污染
29. apply [ plai ] v.施加; 作用
30. meter [ mi:t ] n. 儀表; 米v. 測量;量度
31. near [ ni ] ad. ; prep. 接近; 將近;差不多
32. constant [k nstnt ] a. 恒定的;不變的
33. speed [ spi:d ] n. 速度
34. safe [ seif ] 安全的;穩定的
35. plug [ plg ] n. 插頭;插塞
36. circuit [s:kit ] n. 電路
37. ignition exciter 點火激勵器
38. hermetically [ h: metikli ] ad. 密封的;不透氣的
39. seal [ si:l ] n. ; vt. 密封
40. metal [ metl ] n. ; vt. 金屬
41. install [ inst :l ] vt. 安裝
42. interface [intfeis ] v. 連接
43. sequencing [si:kwnsi ] a. 程序化的
44. energize [end aiz ] v. 激勵;通電;吸合
45. ensure [ inu ] vt. 保證;確保
46. initiate [ iniieit ] vt. 起燃(爆);起始
47. minimum [minimm ] n. ; a. 最低;最小(的)
48. lubricate [lu:brikeit ] v. 潤滑; 滑油
49. build up 形成;產生;出現;增強(大)
50. psig = pounds per square inch gage 表壓(磅/英寸)
51. de-energize [ diend aiz ] vt. 解除激勵; 斷電;釋放
52. remain [ rimein ] vi. 保持… 狀態
53. conduct [ kn dkt ] v. 引導
54. noise [ n iz ] n. 噪音
55. muffler [mfl ] n. 消音器
56. thus [ ðs ] ad. 因而;從而;因此
57. cylindrical [ silindrikl ] a. 園柱(筒)形的
58. felt [ felt ] n. 氈墊;絕緣紙
59. liner [lain ] n. 襯里;襯墊
60. drip pan [ drip ] [ pæn ] n. 盛油器;集油盤
61. gap [ gæp ] n. 間隔;間隙
2
TEXT
[1] The auxiliary power unit (APU) is used for providing :
1) Compressed air for engine starting.
2) Compressed air to the air conditioning system on the ground or in-flight.
3) electrical power to the airplane electrical system on the ground or in-flight,
(we will discuss APU electrical power in the next lesson ).
Fig. 18-1 APU Location
[2] The APU engine is located in the aft end of the fuselage, behind the pressure
bulkhead and below the horizontal stabilizer. The APU engine is completely
enclosed in a titanium shroud. The air inlet door is located on the right side of the
aft fuselage for air entrance. The airflow is split into two paths, one for the engine
and the second for the accessories cooling. The cooling air exhaust overboard
through a hole in lower shroud. The exhaust ducting is cooled by four air inlets
around the jet pipe. Fuel is supplied through a shrouded line from fuel tank. Bleed
air from the APU is supplied to the pneumatic system through a bleed valve, the
bleed air can be used to operate either of the two air-conditioning packs or for main
engine starting. The APU is readily accessible for inspection, maintenance or
removal through a large door in the fuselage directly below it. Removal is
accomplished by lowering the assembly with a simple hoist and cable system.
Fig 18-2 APU (Garrett 85-129 )
The APU is a single shaft gas turbine engine with a two stage centrifugal
compressor, a single combustion chamber and one radial inflow turbine. The
accessories group, driven by the gear box, is at the front of the unit.
　
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