Open rotor engine and fan structure therefor

CN122106947APending Publication Date: 2026-05-29AECC COMML AIRCRAFT ENGINE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AECC COMML AIRCRAFT ENGINE CO LTD
Filing Date
2024-11-22
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The fan structure of open rotor engines presents challenges in noise control, particularly due to interference from tip vortices, root vortices, and nonlinear, multi-scale coupling issues caused by interference between the front and rear rows of blades, making it difficult to meet stringent noise regulations.

Method used

A first noise reduction structure is set at the trailing edge of the rotor blades and a second noise reduction structure is set at the leading edge of the stator blades. The structure includes holes and dissipation cavities, a rectifier section, and a resonant cavity and a medium layer in the hub. The rotor wake and rotor-stator interference noise are suppressed by the viscosity and smooth flow of the airflow.

Benefits of technology

It effectively reduces the fan noise of open rotary engines, meets international airworthiness noise limits, and reduces fuel consumption and CO2 emissions.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present disclosure provides a fan structure of an open rotor engine and an open rotor engine. The fan structure comprises: a hub; rotor blades and stator blades which are sequentially arranged along an airflow direction on an outer periphery of the hub; wherein a trailing edge of the rotor blades is provided with a first noise reduction structure, the first noise reduction structure comprising a plurality of first holes formed on a surface of the rotor blades and a plurality of dissipation cavities located inside the rotor blades, each first hole being in communication with at least one dissipation cavity, and / or a leading edge of the stator blades is provided with a second noise reduction structure, the second noise reduction structure comprising a plurality of fairing portions protruding from a surface of the stator blades, a surface of the fairing portions facing the airflow direction being a smooth curved surface. The open rotor engine comprises the aforementioned fan structure. The fan structure and the open rotor engine provided by the present disclosure can effectively reduce fan noise.
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