Open Rotor Propulsion System with Acoustic Treatment

An apparatus for an aircraft, comprising:

• an open rotor propulsion system including an open propulsor rotor, a turbine engine and a splitter;
• the turbine engine configured to drive rotation of the open propulsor rotor about an axis, the turbine engine including flowpath, a compressor section, a combustor section and a turbine section, and the flowpath extending through the compressor section, the combustor section and the turbine section from an inlet into the open rotor propulsion system to an exhaust from the open rotor propulsion system;
• and
• the splitter disposed at the inlet into the open rotor propulsion system between the flowpath and an environment external to the open rotor propulsion system;
• wherein at least the splitter is configured with an acoustic treatment that borders the environment external to the open rotor propulsion system.

An apparatus for an aircraft, comprising:

• an open propulsor rotor;
• a turbine engine core configured to power operation of the open propulsor rotor, the turbine engine core comprising a compressor section, a combustor section and a turbine section;
• a housing structure including an engine case and a nacelle, the engine case housing the turbine engine core, and the nacelle providing an aerodynamic cover over the engine case;
• and
• an open guide vane structure connected to the housing structure downstream of the open propulsor rotor within an external environment;
• wherein a component of the housing structure is configured with an acoustic treatment downstream of the open guide vane structure along the external environment.