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Post on 26-Jun-2018
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Dr. Ir. Harinaldi, M.Eng, Dr.Ir budiarso M.Eng.Mechanical Engineering Department
Faculty of Engineering University of Indonesia
CoMPRESSoRAND CENTRIFUGAL FAN
PRE-WHIRL AND INLET GUIDES VANES
MACH NUMBER IN THE DIFFUSER
The absolute Mach number of the fluid leaving the impeller may well be in excess of 1. However, it has been found that as long as the radial flow velocity Cr2 is subsonic, then no loss in efficiency is caused by the formation of shock waves.
The effect of inlet guide vanes on the inlet relaltive velocity:(a) at shroud; (b) at hub
CENTRIFUGAL COMPRESSOR CHARACTERISTIC
The theoretical centrifugal compressor characteristic
SURGING
ROTATING STALL
Rotating stall propagation
CHOCKING
CHARACTERISTIC CURVE
Typical centrifugal compressor characteristic
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