| 摘要 |
The invention relates to a method of inhibiting instability during operation of a gas turbine engine, where the instability is due to the uncontrolled interaction between the air filled gap defined by a heat shield and a fuel passage in a fuel injector. The invention is a method of pre-treating the fu el injectors to form a precipitant, such as coke, within the insulating air gap in a controlled and predictable manner prior to installation of the injector into the engine. In this way, the precipitant impedes the flow of air and fu el within the gap, thus substantially reducing engine instability. The method involves filling an annular portion of the gap with a selected fluid, such a s hydrocarbon fuel, and then curing the liquid to form a precipitant, such as coke, that remains physically and chemically stable at temperatures within t he temperature operating range of the injector stem.
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