Transcription of Axial-Flow Compressors
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Axial-Flow Compressors
Introduction The Compressors in most gas turbine applications, especially units over 5MW, use axial fl ow Compressors . An axial fl ow compressor is one in which the fl ow enters the compressor in an axial direction (parallel with the axis of rotation), and exits from the gas turbine, also in an axial direction. The axial-fl ow compressor compresses its working fl uid by fi rst accelerating the fl uid and then diffusing it to obtain a pressure increase. The fl uid is accelerated by a row of rotating airfoils (blades) called the rotor, and then diffused in a row of stationary blades (the stator). The diffusion in the stator converts the velocity increase gained in the rotor to a pressure increase. A compressor consists of several stages: 1) A combination of a rotor followed by a stator make-up a stage in a compressor; 2) An additional row of stationary blades are frequently used at the compressor inlet and are known as Inlet Guide Vanes (IGV) to ensue that air enters the fi rst-stage rotors at the desired fl ow angle, these vanes are also pitch variable thus can be adjusted to the varying fl ow requirements of the engine; and 3) In addition to the stators, anot
Axial Flow Compressor Stators located in the casing As with other types of rotating machinery, an axial compressor can be described in a cylindrical coordinate system. The z axis ... is a straight line drawn from the leading edge to the trailing edge of the airfoil, and the chord is the length of the chordline as seen in
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