Transpirational Cooling Panel With Porous Ceramic Layers
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Solution Overview
Problem
Existing materials used in high-temperature components of vehicles, such as INCONEL, add unnecessary weight and reflectivity, and cause deformation and mechanical stress due to differential thermal expansion, leading to turbulence and potential cracking.
Innovation Solution
A transpirational cooling panel comprising a porous ceramic matrix composite layer, a porous high-temperature fabric layer, and a machined ceramic fiber batting with ceramic stitching, which allows for thermal expansion without distorting the surface and provides efficient cooling through air permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metallic heat-resistant materials like INCONEL are used, then the component can withstand high temperatures, but the component becomes heavier and more reflective to radar
Solution Approach 1:
The patent uses a composite structure consisting of a porous ceramic matrix composite layer combined with a porous high-temperature fabric layer. This composite material provides heat resistance comparable to metallic materials like INCONEL but with significantly reduced weight and radar reflectivity, directly resolving the contradiction between temperature resistance and weight.
Solution Approach 2:
The patent employs porous ceramic matrix composite and porous high-temperature fabric layers. The porous structure reduces material density and weight while maintaining thermal resistance through the porous architecture that allows for thermal management. This approach achieves heat resistance without the full density penalty of solid metallic materials.
2Temperature
If metallic materials are used, then the component can operate at high temperatures, but the component becomes reflective to radar and has low emissivity
Solution Approach 1:
The composite structure of ceramic matrix composite and high-temperature fabric inherently provides non-metallic, non-reflective surfaces. This eliminates radar reflectivity issues associated with metallic materials while maintaining the required heat resistance for high-temperature operation.
Solution Approach 2:
The porous structure of the ceramic and fabric layers creates a non-metallic surface that does not reflect radar waves like metallic surfaces do. The porous architecture provides thermal resistance while presenting a non-reflective surface to electromagnetic waves, resolving the radar reflectivity contradiction.
3Temperature
If rigid materials are used to withstand high temperatures, then the component maintains structural integrity, but the component deforms and experiences mechanical stress due to differential thermal expansion
Solution Approach 1:
The composite structure combines ceramic matrix composite with porous high-temperature fabric, creating a multi-material system where each layer can accommodate thermal expansion differently. This composite architecture reduces differential thermal expansion stresses compared to monolithic rigid materials, preventing deformation while maintaining structural integrity at high temperatures.
Solution Approach 2:
The porous structure of both the ceramic matrix composite and the high-temperature fabric provides compliance and flexibility that rigid dense materials lack. This porosity allows the material to accommodate thermal expansion more gracefully, reducing mechanical stress and deformation during thermal cycling while maintaining heat resistance.
4Temperature
If cooling structures are added to reduce temperature, then the component can withstand thermal loads, but the component surface may become non-uniform and cause turbulence
Solution Approach 1:
The composite structure of ceramic matrix composite and porous high-temperature fabric provides inherent surface uniformity while managing thermal loads. The layered composite architecture maintains a smooth, uniform external surface that does not disrupt airflow, unlike some conventional cooling structures that may create surface irregularities causing turbulence.
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 panel maintains a uniform surface, prevents turbulence, and is significantly lighter than INCONEL, offering efficient cooling and thermal shock resistance while withstanding high temperatures and thermal gradients.
Implementation Method 1
Transpirational cooling panel
Implementation Method 2
porous ceramic matrix composite layer and a porous high-temperature fabric layer
Implementation Method 3
A machined ceramic fiber batting is located between the porous ceramic matrix composite layer and the porous high-temperature fabric layer
Implementation Method 4
allows for thermal expansion without distorting the surface
Data Source
AI summary
A transpirational cooling panel comprises a porous ceramic matrix composite layer and a porous high-temperature fabric layer. A machined ceramic fiber batting is located between the porous ceramic matrix composite layer and the porous high-temperature fabric layer. A ceramic stitching joins the porous ceramic matrix composite layer and the porous high-temperature fabric layer through the machined ceramic fiber batting.