Regenerative cooling (rocketry)
Passing cold propellant through tubes around a rocket engine to cool it / From Wikipedia, the free encyclopedia
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Regenerative cooling, in the context of rocket engine design, is a configuration in which some or all of the propellant is passed through tubes, channels, or in a jacket around the combustion chamber or nozzle to cool the engine. This is effective because the propellants are often cryogenic. The heated propellant is then fed into a special gas-generator or injected directly into the main combustion chamber.
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