Regenerative cooling in rockets is where 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.1857 - Siemens introduced the Regenerative cooling concept. On 10 May 1898, James Dewar used regenerative cooling to become the first to statically liquefy hydrogen]. The concept of regenerative cooling was also mentioned in 1903 in an article by Konstantin Tsiolkovsky. Robert Goddard built the first regeneratively cooled engine in 1923, but rejected the scheme as too complex.

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