Nonlinearly Stacked Turbofan Stator Vane Noise Reduction
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Solution Overview
Problem
Gas turbine engines face challenges in minimizing undesirable noise generated by rotor-stator interactions within the limited space constraints, where existing designs often compromise on aerodynamic performance to reduce tone noise.
Innovation Solution
A nonlinearly stacked low noise turbofan stator design featuring a characteristic curve with nonlinear sweep and lean curves, where the vane is leaned opposite to rotor rotation near the hub and with rotor rotation near the shroud, and is swept more aggressively near the hub to offset acoustic penalties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the stator vane is leaned in the direction opposite to rotor rotation, then aerodynamic performance is improved, but tone noise increases
Solution Approach 1:
The stator vane employs different lean angles at different radial positions: the hub region leans opposite to rotor rotation for aerodynamic benefit, while the tip region leans in the direction of rotor rotation to reduce noise. This local differentiation resolves the contradiction between aerodynamic performance and noise reduction.
Solution Approach 2:
The invention introduces a three-dimensional characteristic curve that combines both lean and sweep components simultaneously. By adding the sweep dimension (axial displacement) to the traditional lean configuration, the design achieves noise reduction while maintaining aerodynamic performance through a multi-dimensional geometric solution.
2Object-generated harmful factors
If the stator vane is leaned in the direction of rotor rotation, then tone noise is reduced, but aerodynamic performance deteriorates in the hub region
Solution Approach 1:
The stator vane employs different lean angles at different radial positions: the hub region leans opposite to rotor rotation for aerodynamic benefit, while the tip region leans in the direction of rotor rotation to reduce noise. This local differentiation resolves the contradiction between aerodynamic performance and noise reduction.
Solution Approach 2:
The characteristic curve dynamically adjusts the lean angle based on radial position, transitioning from negative lean at the hub to positive lean at the tip. This dynamic configuration allows the vane to optimize performance at each location rather than maintaining a uniform lean angle throughout.
3Object-generated harmful factors
If three-dimensional shaping of blades is applied, then noise is reduced, but design complexity increases due to multiple constraints
Solution Approach 1:
The invention defines the three-dimensional vane shape through a characteristic curve parameterized by radial position, with explicit mathematical relationships for lean angle and sweep angle. This parameterization approach simplifies the design process by reducing the complex geometric optimization to a systematic parameter variation, making the design more manageable despite the three-dimensional complexity.
Data Source
AI summary
A nonlinearly stacked low noise turbofan stator vane having a characteristic curve that is characterized by a nonlinear sweep and a nonlinear lean is provided. The stator is in an axial fan or compressor turbomachinery stage that is comprised of a collection of vanes whose highly three-dimensional shape is selected to reduce rotor-stator and rotor-strut interaction noise while maintaining the aerodynamic and mechanical performance of the vane. The nonlinearly stacked low noise turbofan stator vane reduces noise associated with the fan stage of turbomachinery to improve environmental compatibility