The gas-generator cycle, also referred to as the GG cycle, is one of the most commonly used engine cycles in bipropellant liquid rocket engines. Propellant is burned in a gas generator (analogous to, but distinct from, a preburner in a staged combustion cycle) and the resulting hot gas is used to power the propellant pumps before being exhausted overboard and lost.
The gas-generator cycle, also referred to as the GG cycle, is one of the most commonly used engine cycles in bipropellant liquid rocket engines. Propellant is burned in a gas generator (analogous to, but distinct from, a preburner in a staged combustion cycle) and the resulting hot gas is used to power the propellant pumps before being exhausted overboard and lost.
Source: Wikipedia "Gas-generator cycle" · CC BY-SA 4.0
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