Evidential Study of Relationship between Flexible Drift of Fuel Nozzle Performance and Hot-End Failure of X Engine

Abstract

By means of the fountain-convergence analysis method of FRRU (Flow Resistance-Rigidity Uniformity) index defined by the author, evidential comparison analysis study has been made to the relationship between flexible drift of flow performance of WTD (Weight Type Distributor) valves of fuel nozzles of X engine and hot-end failures of X engine. The results show that during the initial period of engine start, because of the relative scarcity of air in the combustor, a convergence characteristic, due to its converging flow property ofmultiple to one, can lead to such hot-end failures as turbine blade fusion break which is characterized byabrupt change, while a fountain characteristic, due to its diffusing flow property ofone tomultiple, cannot result in any hot-end failures.