1) Gas technology 
A gas generator usually refers to a device, often similar to a solid rocket or a liquid rocket that burns to produce large volumes of relatively cool gas, instead of maximizing the temperature and specific impulse. The low temperature allows the gas to be put to use more easily in many applications, particularly to drive turbines. Gas generators a...
A chamber in which propellant is burned to produce high pressure gas that is then used to drive a turbine, e.g. turbopump.
A combustion chamber used to provide hot gases for a turbine or motor to drive the propellant pumps of a rocket engine, or to provide a source of gas at some predetermined pressure. Gas generators are usually operated fuel-rich to maintain the container temperature at reduced values.
installation used to obtain endothermic or exothermic protective atmospheres from fuel gases, ammonia and liquid organic compounds