Aft Stator Duct Ring Configuration for Noise Reduction
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Solution Overview
Problem
Ducted-rotor aircraft experience noise and vibrational instability issues due to the structural configuration of their rotors, which affect their operational efficiency in different flight modes.
Innovation Solution
The structural configuration of ducts in ducted-rotor aircraft is optimized by positioning stators aft of the duct ring's trailing edge, increasing the distance between rotor blades and stators, which reduces noise and enhances vibrational stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If stators are positioned closer to the rotor blades, then the duct structure is more compact, but noise increases and vibrational stability decreases
Solution Approach 1:
The patent repositions stators from a radial arrangement (closer to rotor blades) to an axial arrangement (aft of the duct ring), utilizing the longitudinal dimension to increase the distance between stators and rotor blades while maintaining compact overall structure. This dimensional reconfiguration reduces noise and vibrational instability.
2Object-affected harmful factors
If stators are positioned aft of the duct ring, then noise decreases and vibrational stability increases, but the duct structure becomes more complex
Solution Approach 1:
The duct structure is segmented into distinct components: the duct ring, the stators positioned aft of the ring, and the rotor assembly. This segmentation allows independent optimization of each component's position and function, achieving noise reduction and vibrational stability while maintaining manageable structural complexity through modular design.
Data Source
AI summary
A duct for a ducted-rotor aircraft includes a hub, a duct ring, and a plurality of stators that extend outward from the hub. The hub may be configured to support a motor. The duct ring defines a trailing edge. The duct ring is coupled to each of the plurality of stators such that all or substantially all of each of the plurality of stators is located aft of the trailing edge of the duct ring.