Vascular Composites Two-Phase Cooling for Thermal Stability
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Solution Overview
Problem
Carbon fiber reinforced polymer (CFRP) composites used in aerospace structures exhibit poor heat conduction, leading to thermal distortions and instability in precision pointing systems due to local thermal gradients, which degrade pointing stability and precision.
Innovation Solution
Integration of a vascular network with a closed-loop fluid system containing a liquid refrigerant at or below its saturation temperature, allowing the refrigerant to transition into a two-phase flow for isothermalization and efficient heat management within the composite structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If CFRP composites are used for precision pointing structures, then dimensional stability is improved, but heat conduction deteriorates
Solution Approach 1:
A vascular network containing refrigerant is introduced as an intermediary thermal management system within the CFRP structure. The refrigerant absorbs heat through phase change and convection, acting as a mediator to transport thermal energy away from critical components while preserving the dimensional stability of the CFRP composite structure.
Solution Approach 2:
The invention employs a fluid-based thermal management system where refrigerant circulates through vascular channels embedded in the CFRP structure. The fluid flow (hydraulic/pneumatic principle) enables active heat removal, compensating for the poor heat conduction of the composite material and preventing thermal gradient-induced distortions.
2Stability of the object's composition
If CFRP composites are used for precision pointing structures, then dimensional stability is improved, but thermal distortion increases
Solution Approach 1:
The refrigerant in the vascular network serves as an intermediary that actively manages temperature distribution. By absorbing heat through phase change and convective flow, the refrigerant prevents localized thermal gradients that would otherwise cause thermal distortion and reference frame shifts in the precision pointing structure.
Solution Approach 2:
The system dynamically changes the thermal parameters of the CFRP structure by introducing a phase-change refrigerant that actively absorbs and transports heat. This parameter change (from passive thermal conduction to active phase-change heat removal) maintains dimensional stability by preventing thermal distortion even as heat loads vary.
3Stability of the object's composition
If a vascular network with two-phase refrigerant is integrated, then isothermalization is improved, but device complexity increases
Solution Approach 1:
The thermal management system is merged with the structural composite itself. The vascular network is integrated directly into the CFRP structure during manufacturing, combining structural and thermal management functions into a single unified component. This reduces overall device complexity compared to adding separate cooling systems to an existing structure.
Solution Approach 2:
The CFRP vascular structure serves multiple functions simultaneously: it provides structural support, maintains dimensional stability, and actively manages thermal loads through the integrated refrigerant circulation system. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving superior isothermalization.
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 actively maintains a constant temperature throughout the structure, mitigating thermal distortions and enhancing pointing stability while effectively managing heat loads, applicable beyond aerospace to computing, battery systems, and hypersonic applications.
Implementation Method 1
By using the inherent two-phase capability of fluid (latent heat of vaporization), the flow can remain isothermal as heat is applied
Implementation Method 2
Circulating this two-phase fluid throughout the vascular network will actively isothermalize the composite structure
Data Source
AI summary
A method to improve thermal performance of vascular composites by using a two-phase working fluid for isothermalization includes the steps of: manufacturing a vascular composite structure optimized for a design point; manufacturing a thermal back end sized for the application; integrating the vascular composite into a fluid loop; and evacuating and filling the fluid loop with working fluid to an amount resulting in two-phase operation at the design point.