Gas Turbine Guide Vane Truss Honeycomb Noise Load
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Solution Overview
Problem
Gas turbine engines face challenges in effectively mitigating noise and load-bearing capabilities, particularly in the design of exit guide vanes, which are crucial for efficient operation and acoustic treatment.
Innovation Solution
The design incorporates a vane with a truss structure and honeycomb cells, where the truss structure provides load-bearing capabilities and the honeycomb cells are optimized for acoustic treatment, using materials like titanium alloy and fiber-reinforced polymers, and manufacturing techniques such as additive manufacturing to create a monolithic piece that mitigates audible acoustic frequencies and withstands operational loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid monolithic structure is used for the vane, then load-bearing capacity is improved, but noise absorption capability deteriorates
Solution Approach 1:
The vane incorporates a porous core structure made of foam material (polymer, metal, or ceramic foam) that provides noise absorption capabilities while maintaining structural integrity. The porous structure allows the vane to absorb acoustic energy from exhaust gases while still withstanding operational loads.
Solution Approach 2:
The vane is constructed as a composite structure combining a porous core with external skin layers (metal, polymer, or ceramic). This composite approach allows the porous core to handle noise absorption while the external skins provide structural strength and load-bearing capacity, resolving the contradiction between noise absorption and structural integrity.
2Object-affected harmful factors
If a hollow or porous structure is used for noise absorption, then noise mitigation is improved, but load-bearing capacity deteriorates
Solution Approach 1:
The vane uses a composite construction with external skin layers (metal, polymer, or ceramic) that provide structural strength and load-bearing capacity, while the internal porous foam core provides noise absorption. This composite structure allows both noise mitigation and load-bearing capabilities to coexist.
Solution Approach 2:
Different regions of the vane have different properties: the external skins provide structural integrity and load-bearing capacity, while the internal porous core provides noise absorption. This local differentiation of material properties allows the vane to simultaneously achieve both noise mitigation and structural strength.
3Strength
If complex internal structures (truss or framework) are added to enhance load-bearing, then strength is improved, but manufacturing complexity increases
Solution Approach 1:
The foam core structure provides load-bearing capability through its cellular geometry and material density rather than requiring complex truss or framework structures. By changing the structural approach from rigid frameworks to foam cellular structures, the manufacturing process is simplified while maintaining load-bearing capabilities.
Solution Approach 2:
The vane merges multiple functions into a single integrated structure: the porous foam core simultaneously provides noise absorption, thermal insulation, and load-bearing capability, eliminating the need for separate truss structures and reducing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise and enhances load-bearing capacity, ensuring efficient operation and durability of the gas turbine engine's exit guide vanes.
Implementation Method 1
the honeycomb cells are optimized for acoustic treatment, using materials like titanium alloy and fiber-reinforced polymers, and manufacturing techniques such as additive manufacturing to create a monolithic piece that mitigates audible acoustic frequencies
Data Source
Figure 1~2
Figure 3~5
Figure 4~6
AI summary
A vane (60) includes an airfoil (62) that defines a leading edge (62a), a trailing edge (62b), a pressure side (62d), and a suction side (62c). The airfoil (62) includes a truss structure (66) that has ribs (68) that define there between a plurality of through-cavities (70) from the pressure side (62d) to the suction side (62c). Honeycomb cells (72) are disposed in the cavities (70). A face sheet (74) defines at least one of the pressure side (62d) or the suction side (62c). The face sheet (74) has perforations (74a) that correspond in location to the honeycomb cells (72).