Power plants – Combustion products used as motive fluid – Combustion products generator
Reexamination Certificate
2006-08-22
2006-08-22
Kim, Ted (Department: 3746)
Power plants
Combustion products used as motive fluid
Combustion products generator
C123S1690EB, C123S1690EB, C313S140000
Reexamination Certificate
active
07093421
ABSTRACT:
An igniter for a gas turbine engine. An igniter generates a plasma, or spark, somewhat similar to an automotive spark plug. In the invention, an auxiliary electrode is provided, which is embedded in and covered by a solid insulator. During initial phases of operation, no part of the plasma generated contacts the auxiliary electrode. However, eventually, the covering insulation is eroded by the plasma, and the auxiliary electrode becomes exposed and available as a return path for the plasma. The igniter is constructed so that, when this erosion occurs, the lifetime of the igniter is near its end. Detection of this erosion, as by detecting the new current in the auxiliary ground electrode, indicates the approaching end-of-lifetime.
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Earwood Roy
Ponziani Robert L.
Andes William Scott
Kim Ted
Welte Gregory A.
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