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Stages Of Axial Flow Compressor

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e) Stage and airflow through a stage in axial flow compressor
A stage is a pair of rotating airfoil and stationary airfoil in an axial flow compressor. As the air passes through the rotating airfoil (also called a blade or rotor), its velocity increases. High velocity air then passes through the stationary airfoil (also known as the stator or just vanes) where it is retarded converting the kinetic energy due to velocity increase into static pressure.
f) Reasons for twisting axial flow compressor rotor blades
The rotor blades are usually twisted from the root to the tip, and therefore changing the angle of incidence of the airflow, in order to increase the pressure towards the tip of the blades. This also allows for control of pressure change along the blade.
g) Two methods of attaching rotor blades to a compressor drum
Compressor blades are usually fixed to the drum by use of mechanical feature referred to as roof fixing. The main objective here is to use the lightest fixing means possible so that the overall weight of the disc does not change much. There are two methods for fixing the blades onto the drum.
i) Axial fixing: This is whereby, on the disc, a series of slots are machined in order to fix the dovetail or fir-shaped rotor blades. This method is both complex and costly although it is also robust to handle foreign materials within the compressor. ii) Circumferential fixing: This method is relatively cheaper and simpler since it is easy to machine an annular groove

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