Regenerative Cooling (rocket)
Regenerative cooling, used in the context of rocket engine design, refers to a configuration in which some or all of the propellant is passed through tubes, channels or otherwise in a jacket around the combustion chamber or nozzle to cool the engine because the fuel in particular and sometimes the oxidizer are good coolants. The heated propellant is then fed into a special gas generator or injected directly into the main combustion chamber for combustion there.
Read more about Regenerative Cooling (rocket): History, Heat Flow and Temperature, Mechanical Considerations
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