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Rocket propellant has various requirements, such as higher specific impulse (Isp), large density, non-toxic, storablity, operational reliability and easy handling. In addition, large heat capacity of the fuel is also desirable. A regenerative cooling system is often adopted to cool a combustion chamber because of high combustion temperature (about 3000K), and high heat transfer rates from combustion gas. In the regenerative cooling system, the combustion chamber is a kind of a heat exchanger and fuel of a rocket engine is used as a coolant. The fuel heated in regenerative cooling passage is injected into the combustion chamber and burned. Heat loss from combustion gas to chamber wall is absorbed into the heat capacity of fuel and utilize them to propulsive work again. ( regeneration ).

Control of LNG Pyrolysis and Application to Regenerative Cooling Rocket Engine