GAS-TURBINE ENGINE SPARK PLUG Russian patent published in 1999 - IPC

FIELD: ignition systems of gas-turbine engines primarily using compressed natural gas. SUBSTANCE: spark plug has body accommodating central electrode and enclosed in casing forming cooling space. Casing is provided with inlet and outlet holes as well as with exit hole at butt end and with screen. The latter is secured to butt end on central electrode side and its walls forming inner space are not closed in direction of coolant flow. Inner space of screen communicates through holes with cooling space of casing and with combustion zone which provides for stepwise air flow from cooling space of casing through screen space to obtain air curtain above screen end and plug facing combustion zone and for organizing stable local vortex of reverse-current zone precisely above exit hole for plasma at butt end of casing. EFFECT: improved plug cooling efficiency and starting characteristics which improved operating safety of gas-turbine plant. 2 dwg