Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Larger air handling ability per unit frontal area
Aerofoil blades are used
Higher average velocities
Higher pressure ratio per stage

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Compressors, Gas Turbines and Jet Engines
Water gas is produced by

Partial combustion of coal, eke, anthracite coal or charcoal in a mixed air steam blast
Carbonisation of coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 65°C

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