Abstract:
System for selectively contacting a cleaning composition with a surface of a turbine engine component is presented. The system includes a cleaning apparatus and a manifold assembly. The cleaning apparatus includes an upper portion and a lower portion defining a cleaning chamber configured to allow selective contact between the cleaning composition and a surface of the first portion of the turbine engine component. The upper portion includes a plurality of fill holes in fluid communication with the cleaning chamber, and the lower portion includes a plurality of drain holes in fluid communication with the cleaning chamber. The manifold assembly is configured to selectively circulate the cleaning composition from a reservoir to the cleaning chamber via the plurality of fill holes, and recirculate the cleaning composition from the cleaning chamber to the reservoir via the plurality of drain holes. Methods for selectively cleaning a turbine engine component is also presented.
Abstract:
The present disclosure provides methods and systems of generating flows of detergent through a turbine engine to effectuate cleaning of components thereof. The methods include introducing a foamed, acid-including detergent with a pH range of between 2 and 7 into a gas flowpath of the turbine engine. The methods also include creating a pressure differential in an aft portion of the gas flowpath with respect to a forward portion of the gas flowpath to generate a flow of the detergent therethrough. The methods further include creating a pressure differential in a forward portion of the gas flowpath with respect to an aft portion of the gas flowpath to generate a counterflow of the detergent therethrough. The flow and counterflow of the detergent through the gas flowpath interact with components of the turbine engine having foreign material thereon to at least partially remove the foreign material therefrom.
Abstract:
A coating method is disclosed including forming a first layer on a substrate and forming a second layer on the first layer. Forming the first layer includes applying virgin powder particles containing at least one rare-earth doped ceramic oxide onto the substrate. Forming the second layer includes applying recycled powder particles containing the at least one rare-earth doped ceramic oxide and at least one extraneous material onto the first layer. Another coating method is disclosed including mixing the virgin powder particles with the recycled powder particles to form a mixture of powder particles, and applying the mixture of powder particles onto the substrate. A coated article is disclosed including a substrate and a coating on the substrate, the coating including virgin powder particles of at least one rare-earth doped ceramic oxide and recycled powder particles including the at least one rare-earth doped ceramic oxide and at least one extraneous material.
Abstract:
A cleaning solution for a turbine engine includes water within a range between about 68.65 percent and about 99.63 percent by volume of the cleaning solution; a first organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution; wherein the organic acid comprises citric acid; a second organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution; wherein the organic acid comprises glycolic acid; isoropylamine sulphonate within a range between about 0.07 percent and 0.14 percent by volume of the cleaning solution; alcohol ethoxylate within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution; triethanol amine within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution; sodium lauriminodipropionate within a range between about 0.03 percent and 1.0 percent by volume of the cleaning solution. The cleaning solution has a pH value in the range between about 2.5 and about 7.0.
Abstract:
The present disclosure provides methods and systems for in situ cleaning of hot gas flowpath components of a turbine engine that form portions of a hot gas flowpath extending through the turbine. The hot gas flowpath components may include a layer of accumulated contaminants on first portions thereof that form a respective portion of the hot gas flowpath. The first portions may include a thermal battier coating (TBC), and the layer of accumulated contaminants may overlie the TBC and at least partially infiltrate into the TBC. The accumulated contaminants may include CaO—MgO—Al2O3-SiO2 (CMAS) partial melt. The methods may include introducing an acid-including detergent into the hot gas flowpath of the turbine engine and onto the hot gas flowpath components to clean the accumulated contaminants from the first surfaces of the components.
Abstract:
Methods and systems for in situ cleaning of internal cooling circuits of a turbine engine with detergent that provide cleaning a turbine engine that includes circumferentially arranged internal impingement cooling circuits that each include a baffle plate configured to air cool a respective surface or component of the turbine engine. Detergent is introduced through the outer wall and proximate to a back side of a baffle plate such that the detergent passes through at least aperture in the baffle plate and acts at least upon the surface or component that the baffle plate is configured to cool. The detergent may also act on the front side of the baffle plate that is proximate to the surface or component.
Abstract:
A cleaning solution for a turbine engine includes a reagent composition including water within a range between about 25 percent and about 70 percent by volume of the reagent composition, an acidic component within a range between about 0.1 percent and about 50 percent by volume of the reagent composition, and an amine component within a range between about 1 percent and 40 percent by volume of the reagent composition. The reagent composition is diluted with water by a factor of up to about 40 to form the cleaning solution. The cleaning solution has a pH value in the range between 2.5 and 7.0. The cleaning solution is directed towards a component of the turbine engine having a layer of foreign material thereon, to at least partially remove the foreign material from the component. The layer of foreign material is formed at least partially from at least one of thermal reaction products of the foreign material and interstitial cement.