Aircraft propulsion system with acoustic treatment along bypass flowpath

An aircraft propulsion system, comprising:

• a fan rotor;
• an engine core configured to drive rotation of the fan rotor about an axis;
• an inner housing structure housing the engine core, a radial outer side of the inner housing structure forming an inner peripheral boundary of a bypass flowpath, the inner housing structure including an inner platform, a flowpath wall and an inner nacelle structure, the flowpath wall axially adjacent and between the inner platform and a cowl of the inner nacelle structure along the inner peripheral boundary of the bypass flowpath, and the flowpath wall configured with a flowpath wall acoustic treatment extending along the inner peripheral boundary of the bypass flowpath;
• an outer housing structure spaced radially outboard from the inner housing structure, a radial inner side of the outer housing structure forming an outer peripheral boundary of the bypass flowpath;
• and
• a plurality of vanes arranged circumferentially about the inner platform, each of the plurality of vanes projecting radially across the bypass flowpath from the inner platform to the outer housing structure.

An aircraft propulsion system, comprising:

• a fan rotor;
• an engine core configured to drive rotation of the fan rotor about an axis, the engine core comprising a core flowpath;
• an inner housing structure housing the engine core, a radial outer side of the inner housing structure forming an inner peripheral boundary of a bypass flowpath, the inner housing structure including a splitter structure and an inner platform, a leading edge of the splitter structure radially between and partially forming an inlet into the core flowpath and an inlet into the bypass flowpath, an outer wall of the splitter structure axially next to the inner platform along the inner peripheral boundary of the bypass flowpath, and the outer wall of the splitter structure configured with a splitter structure acoustic treatment extending along the inner peripheral boundary of the bypass flowpath;
• an outer housing structure spaced radially outboard from the inner housing structure, a radial inner side of the outer housing structure forming an outer peripheral boundary of the bypass flowpath;
• and
• a plurality of vanes arranged circumferentially about the inner platform, each of the plurality of vanes projecting radially across the bypass flowpath from the inner platform to the outer housing structure.