Researchers at the Karlsruhe Institute of Technology have achieved a major milestone in hydrogen power by operating a new compressorless gas turbine for a record 303 seconds. The burner uses an advanced form of pressure-gain combustion and surpassed NASA’s previous record of 250 seconds.
Hydrogen can be produced using renewable energy sources, making it a cleaner alternative to natural gas for energy production.
Earlier experiments could continue for only fractions of a second because longer operation would cause the combustion chambers to melt.
The new test extended the operating time to more than five minutes, which is a significant improvement.
Professor Daniel Banuti, Director of the Institute of Thermal Energy Technology and Safety, explains that this is an important step toward highly efficient and flexible hydrogen energy for a fossil-free energy system.
A key benefit of the design is that it does not require energy to compress air before combustion begins, which is a significant advantage over conventional gas turbines.
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The new turbine is built around pressure-gain combustion, which creates the required pressure inside the combustion chamber instead of using a mechanical compressor.
Detonation waves form through a fluid mechanical instability involving wave and vortex patterns in the flowing gases, allowing the turbine to operate without a mechanical compressor.
This approach potentially reduces energy losses, lowers the number of moving components, and improves overall efficiency, as it can operate with fuels other than hydrogen.
Hydrogen is especially suitable because it reacts very quickly and can produce stable increases in pressure, making it a promising option for this technology.
The system could eventually support turbines that are lighter, less expensive, and highly efficient, with potential applications including electricity generation and aviation, according to the findings.
As the world shifts towards cleaner energy sources, innovations like the compressorless gas turbine could play a significant role in reducing reliance on fossil fuels and mitigating the effects of climate change.
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Generating electricity without mechanical compression is a complex task, as the rapid and powerful reactions inside the combustion chamber make it difficult to transfer energy to the turbine in a stable way.
Banuti says that this is extremely difficult because the very fast and intense combustion processes in the chamber make stable energy transfer to the turbine challenging.
Despite these challenges, the team has successfully operated the turbine and generated electricity in the process, marking a significant milestone in the development of hydrogen power technology.
The team’s achievement has the potential to impact various industries, including electricity generation and aviation, as research continues to advance.
More efficient and sustainable power generation solutions can be expected to emerge, and for more information on hydrogen fuel, further reading is available.
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