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航空工程英语基础 ESSENTIAL ENGLISH OF AERONAUTICAL ENGINEERING

时间:2011-06-14 21:26来源:蓝天飞行翻译 作者:航空 点击:

B737-300/400/500上的动力装置提供飞机飞行所需的推力及飞机停止时的反推力,同时为空调、增压系统及防冰系统提供引气,并驱动一个电源及液压系统使用的齿轮箱。 B737飞机的动力来自于安装于机翼上的两台 CFM56-3型高函道比的涡扇发动机,左右发动机的结构是相同的。

(2) The engine is an axial flow turbofan with two rotors and variable stator vanes. The single-stage fan and three –stage low pressure compressor(LPC) are driven, via the low –speed(N1) shaft, by a four-stage low pressure turbine(LPT), the nine stage high pressure compressor(HPC) is driven, via the high speed(N2) shaft, by a single stage high pressure turbine(HPT). The two rotors are mechanically


independent of each other. Air entering the engine is divided into a primary(inner) and a secondary (outer) airstream. After the primary airstream has been compressed by the LPC and HPC , combustin of fuel in the annular combustion chamber increases the HPC discharge air velocity to drive the high and low pressure turbines. The engine is capable of producing approximately 18,500 to 23,500 pounds of thrust at sea level static condition.
发动机是一个有两个转子和不同的定子叶片的轴流式涡轮风扇发动机。单级风扇和三级低压压气机被驱动,经由 N1低速轴,通过一个四级低压涡轮。九级高压压气机被驱动,经由 N2高速轴,通过一个单级高压涡轮。两个转子是彼此独立的机械结构。进入发动机的空气被分成主(内)次(外)两个气流。当主气流被低压压气机和高压压气机压缩后,环形燃烧室内的燃油开始燃烧,增加了高压压气机的排气速度以驱动高、低压涡轮。发动机能够产生在海平面条件下大约 18, 500到 23,500磅的推力。
(3) The engine consist of 4 major modules; fan, core, low pressure turbine and accessory gearbox. The fan major module consists of 4 maintenance modules, they are fan and booster, No.1 and No.2 bearing support, inlet gearbox. No.3 bearing and fan frame. The core major module consist of 8 maintenance modules, they are high pressure compressor (HPC) rotor, HPC front stator, HPC rear stator, combustion outer case, combustion chamber, high pressure turbine (HPT) nozzle, HPT rotor, HPT shroud and 1st – stage LPT nozzle. The low pressure turbine module consisis of 3 maintenance modules, they are low pressure turbine, low pressure turbine shaft and turbine frame. The accessory drive module consists of 2 maintenance modules, they are the transfer gear box and the accessory gearbox.
发动机包含四个组要组件:风扇、主体、低压涡轮及附件齿轮箱。风扇又包含四个主要的维护部件,它们是:风扇和助推器、 1#、2#轴承支架,入口齿轮箱、 3#轴承及风扇骨架。发动机主体主要组件包括 8个维护组件,它们是高压压气机转子、高压压气机前定子、高压压气机后端定子、燃烧室外壳、燃烧室、高压涡轮喷嘴、高压涡轮转子、高压涡轮保护罩及第一级高压涡轮喷嘴。低压涡轮组件包括 3个维护组件,它们是低压涡轮、低压涡轮轴及涡轮支架。附件驱动组件包括 2个维护组件,它们是传动齿轮箱和附件齿轮箱。
(4) The fan and booster provide two separate air stream, the primary airflow passes through the inner portion of the fan rotor, then continues through the booster, the core engine and the LPT, exiting through the core exhaust nozzle. The secondary airflow passes through the fan outer portion and exits through the fan discharge duct(fan air ). The fan is located on the front of the engine, the main function of the fan is to accelerate the air directed to the engine secondary airflow nozzle. This results in producing approximately 78% of the total engine thrust.

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