Air cooled core mounted ignition system
An air cooled core mounted ignition system for gas turbine engine applications is provided. The ignition system includes an ignition exciter component directly mechanically and electrically connected to an igniter component. The housing member of the exciter component includes an air plenum configured to receive bleed air from the engine fan or compressor sections of the turbine engine, or other source. The bleed air provides a relatively low temperature air source for the purpose of cooling the exciter. As such, the exciter component can be directly secured to the igniter, thereby eliminating the need for an ignition lead.
1. An ignition system mounted directly to a housing of a gas turbine engine, adjacent to an engine combustor, the ignition system comprising: an exciter component comprising a housing enclosure having exterior surfaces, the exciter component further including an electrical input and an output high voltage electrical coupling device; a cooling air plenum secured around at least a portion of at least one surface of the housing enclosure, the plenum having an air inlet connector and a plurality of air outlets; and an igniter component having a first end electrically engaged to and received within the output high voltage electrical coupling device and a second end extending into the engine combustor, wherein cooling air is supplied to the air inlet connector from a continuously supplied air source.
2. The ignition system of claim 1 , wherein the housing enclosure is constructed of an extruded aluminum material.
3. The ignition system of claim 1 , wherein the housing enclosure includes top, bottom and opposing closed sides and further includes first and second open ends.
4. The ignition system of claim 3 , wherein the first open end of the housing enclosure is sealed closed by an input cover including the electrical input secured to an outside surface thereof.
5. The ignition system of claim 4 , wherein the input cover includes an EMI filter secured to an inside surface thereof, the EMI filter oriented on the input cover to align with the electrical input.
6. The ignition system of claim 3 , wherein the second open end of the housing enclosure is sealed closed by an output cover including the output high voltage electrical coupling device of the exciter component secured to an outside surface thereof.
7. The ignition system of claim 3 , wherein the cooling air plenum comprises at least one side plenum encompassing and integrally formed with at least one of the opposing closed sides of the housing enclosure, respectively, and a bottom cooling air plenum encompassing the bottom side of the housing enclosure.
8. The ignition system of claim 3 , wherein the cooling air plenum is defined by an exterior surface including a wall and an inner surface comprising the bottom and at least one side of the housing enclosure, and wherein the cooling air plenum has an open air input end and an opposing open air outlet end.
9. The ignition system of claim 8 , wherein the open air input end of the cooling air plenum is sealed using an input end cap, the input end cap including an opening for securing the air inlet connector therein, wherein the open air outlet end of the cooling air plenum is sealed using an outlet end cap, the outlet end cap including the plurality of air outlets formed therein.
10. The ignition system of claim 9 , wherein at least a portion of the plurality of air outlets are formed at an angle within the outlet end cap.
11. The ignition system of claim 1 , wherein the supplied air source is engine fan bleed air.
12. The ignition system of claim 1 , further comprising a heat shield directly mounted to a bottom portion of the housing component.
13. An ignition system for a gas turbine engine comprising: a housing component including an exciter cavity formed integrally with an air cooling plenum, the housing component including upper and lower surfaces, opposing side edges and opposing input and output ends, the input end of the housing component including an electrical input in communication with the exciter cavity and an air inlet connection in communication with the air cooling plenum, wherein the output end of the housing component further includes an electrical outlet in communication with the exciter cavity and a plurality of air outlets in communication with the air cooling plenum; an exciter component mounted within the exciter cavity in electrical engagement with the electrical input and the electrical outlet of the housing component; and an igniter component having a first end electrically engaged to and received within the electrical outlet of the housing component and a second end extending into a combustion zone of the gas turbine engine, wherein cooling air is supplied to the air inlet connection to provide air flow through the air cooling plenum; the ignition system directly mounted to an external surface of a combustion chamber of the gas turbine engine.
14. The ignition system of claim 13 , wherein the housing component is formed of extruded metal.
15. The ignition system of claim 13 , wherein the air cooling plenum of the housing component is substantially L shaped in cross section and surrounds at least one side of the exciter cavity.
16. The ignition system of claim 13 , wherein at least a portion of the plurality of air outlets are formed at an angle within the output end of the housing component.
17. The ignition system of claim 13 , wherein a cooling air source comprising at least one of fan air, compressor air, APU supplied air, and air from an airframe system is secured to the air inlet connection of the air cooling plenum.
18. A method of constructing a leadless ignition system for a gas turbine engine comprising: providing an ignition exciter component comprising an electrical inlet connector, an EMI filter, a charge pump and a capacitor, the exciter component disposed within a housing enclosure and including an external electrical output coupling device in electrical engagement with the exciter component; forming an air cooling plenum around at least one surface of the housing enclosure, wherein the air cooling plenum has an air inlet connector and a plurality of air outlets, at least a portion of the air outlets formed to direct cooling air at the external electrical coupling device on the housing enclosure; removably securing an igniter component directly to the external electrical output coupling device; mounting the housing enclosure including the secured igniter component directly to an external surface of a combustion chamber of the gas turbine engine; and channeling a source of cooling air to the air inlet connector to effect a sufficient amount of cooling on at least one of the exciter component and the igniter component.
19. The method of claim 18 , wherein the cooling air is channeled from a fan section of the gas turbine engine.