Water injection (engine)
In internal combustion engines, water injection, also known as anti-detonant injection (ADI), can spray water into the incoming air or fuel-air mixture, or directly into the combustion chamber to cool certain parts of the induction system where "hot points" could produce premature ignition. In jet engines—particularly early turbojets or engines in which it is not practical or desirable to have an afterburner—water injection may be used to increase engine thrust, particularly at low-altitudes and at takeoff.