What is it about?
It is shown in a numerical simulation that the tonal sound emission of a high-pressure turbine stage may increase considerably when the mean temperature of the inflow is spatially not uniform. Such nonuniformity does exist in all aeroengines and may increase their noise emission.
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Why is it important?
It is shown that the combustor of an aircraft engine may have a surprising influence on the sound radiation of the engine via an interaction between the non-uniform temperature field and the rotor blades. Such an interaction is commonly termed "Indirect combustion noise".
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This page is a summary of: Sound emission of a turbine stage due to an azimuthally periodic mean temperature, International Journal of Aeroacoustics, March 2016, SAGE Publications,
DOI: 10.1177/1475472x15627408.
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