预冷器换热器11-811538
一、名称
PRECOOLER EXCHANGER
预冷器换热器
二、件号
11-811538,11-811538 Amdt A,11-811538-1,11-811538-1 Amdt A
三、章节号
36-11-32
四、适用机型
A330/A340
五、系统
36 PNEUMATIC
气源
六、安装位置
The Precooler is a component of the Air Bleed System installed in the engine pylon
预冷器是安装在发动机吊架上的引气系统的一个部件
七、部件原理
Detailed Description
详细描述
The bleed air precooler consists of a core assembly with a pan assembly welded at each end. The core assembly support plates, side plates and headers, as well as the pan assemblies, are made from corrosion resistant steel.
引气预冷却器由一个核心组件和一个焊接在两端的盘组件组成。核心组件的支撑板、侧板和集管以及盘组件均由耐腐蚀钢制成。
The core assembly consists of a series of tubes mounted in headers and separated by cooling air space. A flanged port is located on each pan assembly to provide inlet and outlet bleed air ports for the core assembly.
核心组件由一系列安装在集管中的管子组成，并由冷却空气空间隔开。每个盘组件上都有一个法兰端口，为核心组件提供进气口和出气口。
Operation Fig FUNC-2
The Precooler admits charge (hot) air bleed from the HP (High-Pressure) or IP (IntermediatePressure) stages of the jet engine. It uses the engine fan air as a cooling air to precool charge air by thermal exchange. Hot air passes inside the precooler tubes, and the cooling air passes outside the tubes.
工作
预冷却器接收喷气发动机 HP（高压）或 IP（中压）级的增压（热）引气。它利用发动机风扇空气作为冷却空气，通过热交换对增压空气进行预冷。热空气通过预冷器管内，而冷却空气则通过管外。
八、工作参数
九、在飞机系统中的工作原理及互联
The engine bleed-air supply-system is installed in the nacelle and pylonof each engine.
发动机引气供应系统安装在每个发动机舱和吊架内。
An air-to-air Precooler Heat-Exchanger (PCE) controls the temperature of the engine bleed air supplied to the distribution system. The engine fan supplies cool air through a Fan Air Valve (FAV) to the PCE. A temperature control thermostat (THC), installed downstream of the PCE controls the butterfly plate of the FAV. This controls the quantity of cool air that enters the PCE.
空气对空气预冷器换热器（PCE）控制供应给分配系统的发动机引气的温度。发动机风扇通过风扇空气活门（FAV）向PCE提供冷空气。安装在PCE下游的温度控制节温器（THC）控制FAV的蝶形板。这控制进入PCE的冷空气量。
Temperature limitation system(Ref. Fig. 007)
This sub-system comprises the following components:
– a precooler exchanger
– a fan air valve associated with a control thermostat.
This sub-system enables the aircraft systems to be supplied with air under a normal temperature lower than or equal to 200⁰C. A second level of control at 150⁰C (adjustable) is available. It is activated by the BMC according to the demand of the air conditioning system.
The bleed air is cooled down by modulating the air flow bled from the engine fan through the precooler exchanger. At the precooler exchanger outlet, the control thermostat adjusts the fan air valve control pressure and thereby the valve butterfly position so as to limit the temperature at the above mentioned values.
温度限制系统（参考图007)
该子系统包括以下组件：
-预冷器换热器
-与控制恒温器相关联的风扇空气活门。
该子系统使飞机系统能够在低于或等于200⁰C的正常温度下提供空气。150⁰C的次级控制（可调）。它由BMC根据空调系统的需求进行激活。
通过调节从发动机风扇到预冷却器换热器的引气流量来冷却引气。在预冷器换热器出口处，控制恒温器调节风扇空气活门的控制压力，从而调节活门板的位置，从而将温度限制在上述值处。
Precooler exchanger(Ref. Fig. 018)
The precooler exchanger ensures the following functions:
– To meet the required temperature for the air conditioning, wing anti ice and other sub-systems, the bleed air has to be cooled by an air-to-air heat exchanger called precooler exchanger.
– The precooler exchanger cools the hot air from the engine compressor by a heat exchange process using cold air bled from the engine fan (via the fan air valve).
– The precooler exchanger is tubular on the hot air side and the cooling air flows over the tubes in a crossflow configuration.
预冷器热换器(参考图018)
预冷器换热器确保具有以下功能：
-为了满足空调、机翼防冰和其他子系统的所需温度，引气必须通过一个称为预冷器热换器的空气对空气热交换器进行冷却。
-预冷器热换器通过使用从发动机风扇的冷引气（通过风扇空气活门）的热交换过程来冷却来自发动机压缩机的热空气。
-预冷器热换器在热空气侧呈管状，冷却空气以交叉流动配置流过管状。
