SATPC0031958 Tab 04 4 SOW.pdf

Thermal Radiation Control by Reconfigurable Emitters based on Textured Materials

SOW for FY 2023 (Jul. 1 23 to Jul. 1 24)

Microstructured materials that can selectively control the optical properties are crucial for the development of thermal management systems in aerospace and space applications. The enables the development of materials that are engineered to selectively emit or absorb thermal radiation in order to manage surface temperature via thermal radiation. It is essential to develop such materials as a multifunctional solution to both radiative thermal control and acoustic attenuation applications. Multifunctionality of such structures will reduce the added weight to the system and allows development of multifunctional material for acoustic noise mitigation and thermal management applications. This work will take advantage of the concept developed by NC A&T and NASA GRC to evaluate multifunctional acoustic and thermal radiative materials in coordination with NASA SMEs (Daniel Sutliff and Ezra McNichols). Due to the similar architectures and materials involved in the two technologies, it seems feasible that their integration can yield a multifunctional material for both thermal and acoustic management in applications like urban air mobility vehicles. This proposal task will focus on development of ultra-lightweight radiative controlled emitters and acoustic absorption material/structure system for waste heat recovery from the nozzle of a high bypass ratio gas turbine engine.

Both experimental and analytical models are needed to support development of lightweight multifunctional microstructured materials for thermal radiation control. UC Irvine has developed machine learning models to design pyramid structures as well as spherical structures for thermal radiation control in previous research work with NASA GRC. UC Irvine will further develop and expand these models to support the analysis of multifunctionality of the materials. A summary of this work and the database will be reported to NASA by February 1, 2023.

Tasks for the FY 2023 are listed below.

Task 1: UC Irvine will develop polymer composites with smaller-scale hollow microspheres to enable thermal radiation control. UC Irvine will perform preliminary thermal characterization of the polymer and will deliver the composites to NC A&T.

• UC Irvine shall develop polymer composites with smaller-scale hollow microspheres to enable thermal radiation control.

• UC Irvine shall perform preliminary thermal characterization of the polymer.

• UC Irvine shall deliver the composites to NC A&T.

Task 2: UC Irvine will acquire samples from NC A&T which the composite polymers are applied on larger-scale hollow microparticles. UC Irvine will complete thermal characterization of these samples using optical spectroscopy, infrared thermography, and surface temperature measurements. The results will be shared with NASA and NC A&T.

• UC Irvine shall perform thermal characterization of samples acquired from NC A&T using optical spectroscopy, infrared thermography, and surface temperature measurements.

Task 3: Using the combined thermal and acoustic data, the effects of multilayer composites with hollow microspheres and polymer coatings will be assessed. UC Irvine will use machine learning algorithms to support the analysis. Any models developed through this analysis will be shared with

NASA.

• UC Irvine shall assess the radiative properties of multilayer composites developed through this program through computational models if necessary.

Task 4: Participate in monthly meetings.

Task 5: Submit a final report summarizing efforts and results.