Editing Space Transport and Engineering Methods/Combustion Engines (section)

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====26 Turbo-Ramjet====

'''Alternate Names:'''

'''Type:''' Gas Flow by Fuel-Atmosphere Combustion

'''Description:''' In this method a multi-stage fan compresses the incoming air stream, which is then mixed with fuel, burned and exhausted.  The compressor is driven by a gas generator/turbine. In a fanjet, the incoming air is compressed and heated by the compressor stages, then mixed with fuel and run through the turbine stages. At higher velocities the air gets hotter in compression since it has a higher incoming kinetic energy. This leads to a higher turbine temperature. Eventually a turbine temperature limit is reached based on the material used, which sets a limit to the speed of the engine. In the turbo-ramjet the compressor is driven by a gas generator/turbine set instead, which use on-board propellant for their operation. Since the gas generator is independent of the flight speed, it can operate over a wider range of Mach numbers than the fanjet ( to Mach 6 vs. to Mach 3).

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