Adaptive Microstructure Thermal Management
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Solution Overview
Problem
Conventional thermal management systems for structures experiencing transient and asymmetric temperature changes, such as those in high-speed aerospace vehicles, are inefficient due to conservative design approaches that lead to over-cooling and excessive coolant usage, as they are typically designed for worst-case scenarios rather than varying thermal loads.
Innovation Solution
The implementation of adaptive structures with micropores and microscale beams that adjust coolant flow rates in response to temperature changes, allowing for localized and dynamic thermal management, similar to human skin's response to thermal stimuli, using MEMS technology for fabrication and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional blanket cooling approaches are used for worst-case scenarios, then the structure is protected against maximum thermal loads, but excessive coolant is consumed and the system becomes inefficient during normal operation
Solution Approach 1:
The patent implements dynamic control of coolant flow through arrays of individually controllable orifices that can adjust their opening area in real-time based on local thermal conditions. This allows the cooling system to adapt to varying thermal loads rather than operating at fixed worst-case design parameters, thereby reducing excessive coolant consumption during normal operation while maintaining adequate cooling when needed.
Solution Approach 2:
The patent divides the cooling system into multiple spatial zones with independently controllable orifices, allowing each region to receive coolant flow proportional to its local thermal demand. This localized control enables the system to address specific hot spots without over-cooling other areas, optimizing coolant distribution and reducing overall consumption.
2Temperature
If conservative design approaches are used to ensure adequate cooling, then the structure maintains temperature within range, but the system weight increases due to excessive coolant volume requirements
Solution Approach 1:
The dynamic adjustment capability of the controllable orifices allows the system to use only the minimum necessary coolant volume for each operational phase and thermal condition. This eliminates the need to design for maximum coolant storage capacity based on worst-case scenarios, thereby reducing the overall coolant system weight while maintaining adequate temperature control.
Solution Approach 2:
The system changes the flow rate parameter of coolant dynamically based on real-time thermal conditions rather than maintaining a constant conservative flow rate. This parameter adjustment allows the same coolant volume to serve multiple operational requirements efficiently, reducing the total coolant volume needed and thus the system weight.
3Ease of manufacture
If fixed orifice arrays are used for passive cooling, then the system is simple to implement, but the cooling efficiency is poor under varying thermal loads
Solution Approach 1:
The patent replaces fixed orifices with controllable orifices that can dynamically adjust their flow characteristics in response to varying thermal loads. This dynamic capability significantly improves cooling efficiency under different operational conditions while maintaining reasonable system complexity through the use of straightforward control mechanisms.
Solution Approach 2:
The controllable orifice design serves multiple functions: it acts as a flow restriction element like a fixed orifice, but also provides active flow control, thermal management, and adaptation to varying conditions. This multi-functionality improves cooling efficiency across diverse thermal scenarios without requiring entirely separate systems for different operating modes.
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
This approach reduces coolant usage, minimizes weight, and provides efficient thermal management by adjusting coolant flow based on real-time thermal loads, reducing the need for excessive coolant and improving the structure's operational efficiency across varying thermal conditions.
Implementation Method 1
a skin panel having a first surface, a second surface and at least one micropore extending from the first surface and the second surface
Implementation Method 2
At least one adaptive structure is associated with the at least one micropore and is configured to alter a flow rate of coolant through the at least one micropore responsive to temperature sensed by the at least one adaptive structure
Data Source
AI summary
Adaptive structures, systems incorporating such adaptive structures and related methods are disclosed. In one embodiment, an adaptive structure is provided that includes a first structure and at least one microstructure associated with the first structure. The at least one microstructure may include a microscale beam configured to be displaced relative to the first structure upon the adaptive structure being exposed to a specified temperature. The beam may be formed, for example, of a metallic material, of multiple different metallic materials, or of a shape memory alloy. In one embodiment, a plurality of the adaptive structures may be associated with micropores of a skin panel. The adaptive structures may be utilized to control the flow rate of a coolant or other fluid through the micropores responsive to a sensed environmental parameter such as, for example, temperature.