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Researchers model engine 'core noise' for first time

26 January 2016

DLR researchers have  determined the physics behind what is referred to as gas turbine engine 'core noise' and represented it in a numerical model.

One of the tested turbine stages (photo: DLR)

Researchers at the German Aerospace Centre (DLR) have been dismantling current aircraft engines and and conducting physical modelling to determine where exactly the noise in aircraft engines generate. They also wanted to find out how the noise sources change when modifications are made to engine components. The result of this work is a new model that the researchers believe will lead to the design of quieter engines.

The causes of aircraft noise vary greatly. "We are particularly interested in the processes that occur between the turbine and the combustion chamber," says Friedrich Bake from the DLR Institute of Propulsion Technology. "For this reason, we have designed several experiments and tested them on test rigs in this country and abroad."

The engine acoustics researchers succeeded for the first time in determining the physics behind what is referred to as 'core noise' and represented it in a numerical model. The processes involved in the generation of core engine noise can be accurately demonstrated with the model claim the researchers. The model has been validated following special tests at various research locations in Europe.

Simulation of the combustion chamber-turbine interaction (image: DLR)

"The test results are available to the global research community in a database," says Bake. "So our research can also be used in new projects and application studies."

DLR coordinated this work as part of the EU RECORD project, in collaboration with 18 European partners.

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