Analysis of Dynamic Wear at the Jet Nozzle Shutters Synchronization System Elements

This study is aimed at increasing of durability by the synchronization system of gas turbine engine nozzle exit. The analysis of in-service environment and elements design features of the jet nozzle shutters synchronization system in area of contact between the slider and the upper guide plate were complied with. To assess the dynamic wear of elements, a finite element model was created. Strength calculations were performed under the conditions of contact interaction and oscillatory loads. The simulation results of the slider behavior were verified experimentally. The tests involved sliders of different geometric forms and different coatings, selected by accordance with principles of frictional compatibility. It was meant to due to dynamic wear, a characteristic type of destruction of elements contact surfaces of the jet nozzle shutters synchronization system is frettage, accompanied by fatigue spalling of the friction surfaces in the form of pitting. Recommendations for optimizing of the slider's geometry and the using of hard anti-friction coatings are given.