| 摘要 |
A fuel metering device of simple design is provided, utilizing a unique cooling air supply mechanism for cooling the feul supply spraybar and fuel metering valve of an aircraft or afterburner, such a mechanism also functioning as a piston position control agent, which in turn controls the fuel supply rate of fuel injected into the combustor. The spraybar is filled with fuel under pressure at all times, and a leaky sleeve prevents potential coking fuel due to the high combustor temperatures. Additionally, the piston for actuating the fuel metering valve requires no gasket, as cooling air is passed about its periphery, and a pair of cooling air supply valves control the pressure differential across the opposite faces of the piston to in turn selectively position the pintle of the fuel injection valve to change the flow rate of fuel into the combustor.
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