Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Exit nozzle, which is a constant volume process
Exit nozzle, which is essentially an isentropic process
Turbine blades, which is essentially an isentropic process
Turbine blades, which is a constant volume process

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

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

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