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航空术语词典 Dictionary of Aeronautical Terms 上(148)

时间:2011-03-11 23:11来源:蓝天飞行翻译 作者:admin 点击:


compressor disk (gas turbine engine component). The inner section of a compressor wheel that makes up a stage of compression in an axial-flow compressor. The disk mounts on the compressor shaft, and the rotor blades mount around the periphery of the disk. There is one compressor disk for each stage of compression.
compressor pressure ratio (gas turbine engine parameter). The ratio of the pressure of the air at the compressor discharge to the pressure at the compressor inlet.
compressor stage (gas turbine engine). The components in an axial-flow compressor which consist of one set of rotor blades and the following set of stator blades.
Axial-flow compressors have a number of stages of compression. Each stage consists of rotor blades to increase the velocity of the air and stator blades to convert the velocity energy into pressure.
compressor stall (gas turbine engine operating condition). A condition in a turbine engine axial-flow compressor in which the angle of attack of one or more blades becomes excessive and the smooth airflow through the compressor is disrupted.
When only a few blades stall, the effect is minimal and is noticed by a fluttering or rumbling sound. When the entire compressor disk stalls, the effect can be a serious slowing down of the air through the engine. This can result in a loud explosive noise with a resulting RPM fluctuation and a serious increase in exhaust gas temperature. A compressor stall can occur if the airflow through the engine is restricted while the compressor RPM is high.
compressor stall-margin curve (gas turbine engine operation). A gas turbine engine operating curve which shows the relationship between the compression ratio of the engine and the mass airflow that must be maintained through the engine.
compressor surge (gas turbine engine operating condition). A severe compressor stall across the entire face of the compressor. Compressor surges occur when there is a complete stoppage of airflow, or a reversal of flow through the compressor. A compressor surge can cause a flameout or, if it is severe enough, can cause structural damage.
compulsory reporting points (air traffic control). Reporting points which must be reported to ATC. Compulsory reporting points are shown on IFR charts as solid triangles.
computer (electronic). A device that receives data, processes it, and then uses it in some type of output device. There are two types of electronic computers, digital and analog.
concave surface. A surface that is curved inward with the outer edges higher than the center.

concentration cell corrosion. A form of corrosion on metal alloys caused by a potential difference in the electrolyte, rather than by a potential difference caused by a galvanic couple within the metal. The potential difference in the electrolyte may be caused by a concentration of either oxygen or metallic ions.
concentric. Having the same center.
concentric circles. Circles which have the same center.

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