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被引入。空氣流進組件中通過組件活門調節。
(3) Air from the pneumatic manifold is too warm and must be cooled. The
pupose of 2 packs is to reduce engine bleed air temperature to the desired
temperature.
從增壓主管道中來的空氣太熱，需要降溫。兩個組件的作用就是將發
動機引氣溫度降低到需要的溫度。
(4) An air cycle machine is an integral unit of each cooling pack. The air
cycle machine consists of a turbine wheel and a compressor wheel
mounted on a common shaft. Air flowing through the air cycle machine
drives the turbine, the turbine drives the compressor section. As the air
leaves the turbine it expands greatly. This expansion can cause the
temperature of the air to drop to sub-zero levels.
渦輪冷卻器是構成每個冷卻組件所必需的。它包括一個渦輪和一個壓
氣機，安裝在共同的軸上。氣流通過渦輪冷卻器驅動渦輪，渦輪驅動
壓氣機部分。當空氣離開渦輪后急劇膨脹。這種膨脹能夠導致空氣溫
度降到零度以下的程度。
(5) In figure 3-1, we can see that the conditioned air from the right pack flows
into the main distribution manifold, the conditioned air from the left pack
flows into the main distribution manifold and into the flight compartment.
In addition, a trim air line from the left mix chamber adds hot air to the
flight compartment duct. The main distribution manifold supplies the
passenger compartment overhead distribution system through tow sidewall
risers.
在圖3-1 中，我們可以看出，調節空氣從右組件流向主分配管道，還
有調節空氣從左組件流向主分配管道和進入駕駛艙。另外，從左混合
艙出來的配平空氣管道增加熱空氣給駕駛艙管道。主分配管道通過兩
個側壁豎管供氣給客艙頂部分配系統。
(6) A 3-phase fan draws air from the collector shroud through filters and
discharges into the main distribution manifold for redistribution.
一個三相風扇從收集器防護罩穿過過；濾器和排出口進入主分配管
道，用以再分配。
LESSON 4 PRESSURIZATION INTRODUCTION 增壓系統簡介
一、單詞
組件Pack 控制Control \座艙高度Cabin altitude
外流閥Outflow valve 保持Maintain 盡可能的… As as possible
目的地destination 安全的Safe 舒適的Comfortable
曲線Curve 對時間的Against time 起飛Takeoff
巡航Curise 虛線Dotted line 實線Solid line
爬升Ascend 下降Descent 近Near
環境ambient 減小decrease 變化率rate
確定、決定Determine 大氣Atmosphere 例子Example
磅/英寸Psi=pound per
square inch
參照… By referring 圖表Chart
描繪Depict 與…的關系曲線versus 稱之為… Is referred to as
制度Sytstem 水銀mercury 毫巴Millibar
相等的identical 施加exert 排出exhaust
向機艙外outbroud
二、TEXT
(1) the air conditioning packs supply conditioned air into 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.
空調組件為增壓系統提供調節空氣。增壓系統通過調節機身氣流控制
客艙高度，通過外流閥，增壓系統保持客艙高度盡可能的接近海平面
或等于飛行目的地高度，這樣增壓系統可為機組和旅客在整個飛行過
程中提供一個安全舒適的客艙高度。
(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.
圖4-2 顯示為飛機和坐艙高度在起飛、巡航及著陸階段的時間曲線。
飛機高度顯示為虛線，坐艙高度顯示為實線。飛機以接近海平面的機
場高度開始飛行、爬升、巡航、下降和接近海平面的機場著陸。
(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.
客趁高度開始于起飛高度。當飛機爬升時，環境壓力減小，高度越高，
壓力越低。飛機內部高度（坐艙高度）也以一個低于飛機的速率爬升。
增壓系統提供客艙與外界環境之間的壓力差。
(4) The airplane altitude above sea level is determined by measuring the
pressure of the ambient atmosphere. For example, see figure4-3, at 30,000
feet above sea level the ambient pressure would be 4.36 psi. the cabin
altitude can be measured by adding the ambient pressure to the 7.80 psid
maintained in side the airplane by the pressurization system: ambient
pressure 4.36 psi at 30,000 ft.
　
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