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被引入。空氣流進(jìn)組件中通過組件活門調(diào)節(jié)。
(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(fā)
動機(jī)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(gòu)成每個冷卻組件所必需的。它包括一個渦輪和一個壓
氣機(jī)，安裝在共同的軸上。氣流通過渦輪冷卻器驅(qū)動渦輪，渦輪驅(qū)動
壓氣機(jī)部分。當(dāng)空氣離開渦輪后急劇膨脹。這種膨脹能夠?qū)е驴諝鉁?br /> 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(diào)節(jié)空氣從右組件流向主分配管道，還
有調(diào)節(jié)空氣從左組件流向主分配管道和進(jìn)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(cè)壁豎管供氣給客艙頂部分配系統(tǒng)。
(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(fēng)扇從收集器防護(hù)罩穿過過；濾器和排出口進(jìn)入主分配管
道，用以再分配。
LESSON 4 PRESSURIZATION INTRODUCTION 增壓系統(tǒng)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(shí)線Solid line
爬升Ascend 下降Descent 近Near
環(huán)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(guān)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(jī)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(diào)組件為增壓系統(tǒng)提供調(diào)節(jié)空氣。增壓系統(tǒng)通過調(diào)節(jié)機(jī)身氣流控制
客艙高度，通過外流閥，增壓系統(tǒng)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(tǒng)可為機(jī)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(jī)和坐艙高度在起飛、巡航及著陸階段的時間曲線。
飛機(jī)高度顯示為虛線，坐艙高度顯示為實(shí)線。飛機(jī)以接近海平面的機(jī)
場高度開始飛行、爬升、巡航、下降和接近海平面的機(jī)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(dāng)飛機(jī)爬升時，環(huán)境壓力減小，高度越高，
壓力越低。飛機(jī)內(nèi)部高度（坐艙高度）也以一個低于飛機(jī)的速率爬升。
增壓系統(tǒng)提供客艙與外界環(huán)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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