Climate-neutral air traffic with hydrogen should relieve the burden on the environment in the future. Researchers at ETH Zurich have now laid the foundation for the development of sustainable hydrogen aircraft engines. They tested the acoustic behavior of hydrogen injectors in the laboratory under conditions similar to those at cruise altitude.
The type of fuel has a major influence on the interactions between sound and flame. Engineers and researchers must therefore ensure that no vibrations arise in a new hydrogen engine.
“Hydrogen burns faster than kerosene. For this reason, it produces smaller and more compact flames,” says Nicolas Noiray, professor at the Department of Mechanical and Process Engineering at the Swiss Federal Institute of Technology in Zurich (ETH), in the journal “Combustion and Flame”.
This must be taken into account when designing hydrogen engines. Vibration is a problem that engineers are trying to control. They would be caused by the mutual interaction of sound waves and flames and would put heavy strain on the engine, even in today’s kerosene engines. They achieved this by optimizing the shape of the flames and the geometry and acoustics of the combustion chamber.
In a few years, a functioning hydrogen engine should be ready for the first tests on the ground.
Source: Krone
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