| 摘要 |
A spark plug for combustion chamber of a gas turbine engine comprising an external body 1 forming a ground electrode, intended to be received mainly in a bypass of the combustion chamber, an internal central electrode 2, an interposed insulator 3 with clearance between the external body 1 and the internal electrode 2. The spark plug terminating in a nose forming portion 5 to be received in the flame tube of the combustion chamber, a semiconductor element 4 being interposed between the central electrode and the ground electrode at the nose portion, wherein the external body 1 comprises at least one cooling air inlet 6 which communicates inside the spark plug with at least one outlet 8, 9, 10 arranged at the nose portion and the insulator 3 also having an air inlet 11wherein the cooling air flows between the electrode 2 and the insulator discharging at the nose level via the clearance 12 between the electrode 2 and the semiconductor 4. |
