Global first test success for NASA space power system
A spacecraft power system that combines the technological know-how of engineers and scientists at the University of Leicester and NASA Glenn has passed its first test with flying colors.
In late 2024, the university signed an International Space Act Agreement with NASA to enable collaborative use of engineering design and laboratory resources at NASA Glenn, and the teams proceeded to test a revolutionary innovation that can positively impact space exploration.
The two groups are collaborating on a project to combine electrically-heated simulators of americium heat sources developed at the university, with Stirling power convertor technologies from NASA Glenn. The pairing builds on the development of radioisotope power systems at the university, which has been in progress for over a decade.
The heat sources being developed by the university are powered by americium-241, which is an alternative to the plutonium-238 heat sources that have historically been flown in space.
Together, the teams collaborated on a practical demonstration of a bench-top generator prototype, using electrically-heated replicas of an americium heat source and Advanced Stirling Convertors. The successful completion of the test campaign was a significant achievement for the teams. This is a global first demonstration of how an americium heat source can be used to drive multiple Stirling engines to generate electrical power.
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Integration of the Am-RSG benchtop demonstrator hardware at NASA Glenn. Credit: University of Leicester -
University of Leicester team members supporting the integration and testing activities of the Am-RSG at NASA Glenn. Credit: NASA GRC
This successful test also reinforces the university's multi-decadal leadership in radioisotope power systems and philosophy of building international collaboration. This positive outcome places the team at the forefront of worldwide use of americium-fueled space nuclear power systems.
These systems could be used to power future space missions into new frontiers by converting heat from americium-241 heat sources into electricity via Stirling convertors.
Dr. Hannah Sargeant, research fellow in the Space Nuclear Power team at Space Park Leicester, said, "A particular highlight of this design is that it is capable of withstanding a failed Stirling convertor without a loss of electrical power.
"This feature was demonstrated successfully in the test campaign, and highlights the robustness and reliability of an Americium-Radioisotope Stirling Generator for potential future spaceflight missions, including long duration missions that could operate for many decades. Our hardware forward approach with rapid iteration cycles continues to deliver positive and exciting outcomes."
Provided by University of Leicester
