航空工程英语基础（中英文对照）(4)

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system through two sidewall risers.
6 A 3-phase fan draws air from the collector shroud through filters and discharges
into the main distribution manifold for redistribution.
EXERCISE
A. Find out the explanations of the following words in your “English -Chinese
technical dictionary”.
1. manifold  P1-98 
2. air cycle machine  P1-4 
3. riser  P1-126 
4. shroud  P1-135 
5. pack valve [ P1-111 ]
6. turbine [ P1-182 ]
7. compressor [ P1-33 ]
B. Read the text loudly and clearly.
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LESSON 4
PRESSURIZATION INTRODUCTION
VOCABULARY
1. pack  pæk  n. 组件
2. control  kntrul  v. 控制;操纵;管理
3. cabin altitude  kæbin   æltitju:d  座舱高度
4. outflow valve  autlu   vælv  外流阀(活门)
5. maintain  mentein  vt. 保持
6. as……as possible 尽可能地……
7. destination  destinein  n. 目的地;终点
8. safe  seif  a. 稳定的;安全的
9.comfortable  kmtbl  a. 舒适的
10. curve  k:v  n. 曲线
11. ……against  genst  time ……对时间的
12. takeoff  teik :  n. 起飞;离去
13. cruise  kru:z  n. ; v. 巡航;航行
14. dotted line  d tid   lain  虚线
15. solid line  s lid   lain  实线
16. ascend   send  v. 上升;爬高
17. descend  disend  v. 下降;落下
18. near  ni  prep. 接近;靠近;差不多
19. ambient  æmbint  n. 环境;周围
20. decrease  di:kri:s  v. 减小;下降
21. rate  reit  n. 变化率;速率
23. determine  dit:min v. 确定;测定;决定
24. atmosphere  ætmsi  n. 大气; 空气
25. example  ig za:mpl  n. 例子
26. psi = pounds per square inch 磅/英寸
27. by referring  ri ri  to 参照……;借助……
28. chart  ta:t  n. 图表;曲线图
29. depict  di pikt  vt. 描绘;画图
30. versus  v:ss  prep. 与……的关系曲线
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31. is referred to as 称之为……;叫做……
32. system  sistm  n. 方法;制度
33. mercury  m:kjuri  n. 水银Hg
34. millibar  miliba:  n. 毫巴;10
35. identical  ai dentikl  a. 相等的
36. exert  ig z:t  vt. 施加
37. exhaust  ig z :st  v. 排出;排气
38. overboard  uvb :d  ad. 向机舱外
TEXT
1 The air conditioning packs supply conditioned air into the pressurization system.
The pressurization system controls cabin altitude by regulating air flow from the
fuselage, through the outflow valve. The pressurization system maintains cabin
altitude as close to sea level as possible or at an altitude equal to the altitude of the
flight destination, so the pressurization system provides a safe comfortable cabin
altitude for the crew and passenger at all airplane altitude.
Fig.4-1 pressurization introduction
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2 Figure 4-2 shows a curve of airplane and cabin altitude against time from take
off through cruise to landing. Airplane altitude is shown in dotted line. Cabin
altitude is shown in solid line . The airplane starts its flight at an airport altitude
near
sea level, ascends, cruises, and
descends to a landing airport near
sea level.
Fig 4-2 pressurization fundamentals
3 Cabin altitude starts at the take off altitude. As the airplane climb,The ambient
pressure decreases: the higher the altitude,the lower the pressure. The altitude inside
the airplane (cabin altitude )also climbs but at a lower rate than the airplane . The
pressurization system provides the pressure differential between the cabin and
ambient .
4 The airplane altitude above sea level is determined by measuring the pressure of
the ambient atmosphere. For example, see figure 4-3 , at 30,000 feet above sea level
　
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