Abstract:
An electrode for rejuvenating a cooling passage within an airfoil, the electrode including a tip, an end, a conductive core extending between the tip and the end, and an insulating coating disposed on the conductive core. The insulating coating exposes a number of conductive strips of the conductive core extending between the tip and the end. The insulating coating forms a number of insulating portions and further exposes a number of spacer portions of the conductive core longitudinally positioned between the insulating portions. The insulating portions substantially span a distance between the tip and the end and are positioned between the conductive strips.
Abstract:
A slot armor component for use in a rotor of a dynamo-electric machine comprises a plurality of profile co-extruded polymer layers. The composite cross-section of the profile co-extruded layers may include a first leg portion and a second leg portion disposed at an angle to the first leg portion. The plurality of co-extruded polymer layers may include a glass-filled polymer layer arranged between two unfilled polymer layers such as a glass-filled Ultem layer having a glass-fill concentration equal to or less than 30% arranged between two unfilled Ultem layers or a glass-filled polyetheretherketone (PEEK) layer having a glass-fill concentration equal to or less than 30% arranged between two unfilled PEEK layers.
Abstract:
A slot armor component for use in a rotor of a dynamo-electric machine comprises a profile extruded material having a first leg portion and a second leg portion disposed at an angle to the first leg portion, the second leg portion being shorter and thicker than the first leg portion. The material may be glass-filled polyetheretherketone (PEEK) such as a less than or equal to 30% (null30%) glass-filled polyetheretherketone (PEEK). Alternatively, the material may be unfilled polyetheretherketone (PEEK), glass-filled Ultem such as less than or equal to 30% (null30%) glass-filled Ultem, or unfilled Ultem.
Abstract:
A method for controlling distortion of a turbine case (nullcasenull) includes measuring a temperature distribution for the case that includes thermal gradients. The method further includes modeling thermal stresses on the case induced by the thermal gradients, calculating an out of roundness index (nullindexnull) resulting from the thermal stresses, and comparing the index with at least one distortion limit to determine whether the case has a satisfactory or an unsatisfactory index. The temperature distribution is controlled for an unsatisfactory index to produce the satisfactory index. A system for controlling distortion of the turbine case includes a thermal measurement system, for measuring the temperature distribution, and a computer configured for modeling the thermal stresses, calculating and comparing the index with the distortion limit, and controlling the temperature distribution for an unsatisfactory index to produce the satisfactory index.