Gas turbine engine wash systems and methods

A wash system for a gas turbine engine comprising:

• an inlet assembly comprising:
• a first fluid conduit in fluid communication with a gas source;
• and
• a second fluid conduit in fluid communication with a detergent source;
• a delivery nozzle coupled to the inlet assembly, the delivery nozzle having a porous structure disposed therein;
• a regulator controlling gas flow into the delivery nozzle, the regulator disposed in the first fluid conduit;
• and
• a controller configured to operate the regulator to cause the wash system to switch between a foam washing mode and a liquid washing mode, wherein the controller sets the regulator to a low pressure in the foam washing mode to generate a foam and sets the regulator to a high pressure in the liquid washing mode to deliver liquid detergent.

A wash system for a gas turbine engine comprising:

• an inlet assembly comprising a first fluid conduit defining a first fluid passageway for delivering a foam and a second fluid conduit defining a second fluid passageway for delivering a liquid, the first fluid conduit in fluid communication with a foam source and the second fluid conduit in fluid communication with a liquid source;
• a delivery nozzle that is elongated along a longitudinal axis from a feed end to a delivery end, the feed end of the delivery nozzle coupled to the inlet assembly, the delivery nozzle comprising at least one outlet opening;
• a plurality of valves for controlling fluid flow into the delivery nozzle, the plurality of valves including a first valve in the first fluid passageway and a second valve in the second fluid passageway;
• and
• a controller configured to actuate the plurality of valves to cause the wash system to switch between a foam washing mode and a liquid washing mode, wherein the delivery nozzle delivers the foam in the foam washing mode and delivers the liquid in the liquid washing mode.