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AXIAL FLOW COMPRESSORSCOMPRESSORS

Compressor:An instrument or device for compressing something.MachinethatincreasesthepressureofagasMachineforreducingvolumeandincreasingpressure ofgasesinordertocondensethegases.Classification of Compressors:POSITIVE DISPLACEMENTDYNAMICROTARY COMPRESSORS

RECIPROCATING COMPRESSORSCENTRIFUGAL COMPRESSORSAXIAL COMPRESSORS

Applications:MARINE APPLICATIONSOn board a ship, compressed air is used for several purposes. On the basis of application, different air compressors are kept for a particular usage. Normally, air compressors on board ships are:

Main air compressor

Topping up compressor Deck air compressor

Emergency air compressor

WORKING PRINCIPLENumber of stages (single-stage, 2-stage and multi-stage),Cooling method and medium (Air cooled, water cooled and oil-cooled),Drive types ( Engine driven, Motor driven, Turbine driven, Belt, chain, gear or direct coupling drives),Lubrication method (Splash lubricated or forced lubrication or oil-free compressors).Service Pressure (Low, Medium, High)Classification ofAxial flow compressors

Thesuction surface(a.k.a. upper surface) is generally associated with higher velocity and lower static pressure.Thepressure surface(a.k.a. lower surface) has a comparatively higher static pressure than the suction surface. The pressure gradient between these two surfaces contributes to the lift force generated for a given airfoil.The geometry of the airfoil is described with a variety of terms:Theleading edgeis the point at the front of the airfoil that has maximum curvature (minimum radius).[7]Thetrailing edgeis defined similarly as the point of maximum curvature at the rear of the airfoil.Thechord lineis the straight line connecting leading and trailing edges. Thechord length, or simplychord, , is the length of the chord line. That is thereference dimensionof the airfoil section.