Variable area fan nozzle with wall thickness distribution

摘要

A gas turbine engine includes a core engine that has at least a compressor section, a combustor section and a turbine section disposed along a central axis. A fan is coupled to be driven by the turbine section. A fan nacelle is arranged around the fan, and a bypass passage extends between the fan nacelle and the core engine. A variable area fan nozzle (VAFN) extends at least partially around the central axis and defines an exit area of the bypass passage. The VAFN is selectively movable to vary the exit area. The VAFN includes a body that defines an airfoil cross-section shape. The VAFN includes a wall that has a mechanical property distribution in accordance with a computer-simulated vibration profile of a flutter characteristic of the VAFN.

主权项

1. A gas turbine engine, comprising:
a core engine including at least a compressor section, a combustor section and a turbine section disposed along a central axis; a fan coupled to be driven by the turbine section; a fan nacelle around the fan, and a bypass passage extending between the fan nacelle and the core engine; and a variable area fan nozzle (VAFN) extending at least partially around the central axis and defining an exit area of the bypass passage, the VAFN being selectively movable to vary the exit area, the VAFN including a body defining an airfoil cross-section shape, the VAFN including
a wall having an undulating profile, anda smoothing layer in contact with at least the undulating profile, a thickness of the smoothing layer varying inversely with the undulating profile such that an exterior of the smoothing layer over the undulating profile has a non-undulating profile,wherein the undulating profile creates a mechanical property distribution in accordance with a computer-simulated vibration profile of a flutter characteristic of the VAFN.