Inlet fogging is a widely used method to augment power in gas turbines. It is used to cool the inlet air. It also reduces NOx emissions and CO2 emission rates. The inlet fogging system is designed to produce fog droplets that are small enough to evaporate quickly into the inlet air stream. It cools the air by evaporating the fog droplets into the air, thereby reducing the ambient temperature to the wet bulb temperature.

Inlet Guide vane bleed system is an improvement to a turbofan engine intended to reduce fan noise caused by the interaction of the rotor with secondary flow generated by the inlet guide vanes. A portion of the air flowing through the engine is removed from the fan duct from a region between the inlet guide vanes and the rotor and near the outer periphery of the fan duct by a system of bleed ducts. The ducts have one or more openings in the fan casing. The system may also include means for controlling the flow through the bleed ducts and means for injecting high energy flow into the bleed ducts to assist in ejecting the bleed flow.