Turbofan Tone Noise Reduction by Flow-Induced Unsteady Blade Forces

Steger, Mathias; Michel, Ulf; Ashcroft, Graham; Thiele, Frank

doi:10.1007/978-3-642-11735-0_11

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Flow Solver1

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2016

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Cited by 3 publications

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“…The solver was also applied to simulate the tonal noise radiation in the upstream direction. [20][21][22] The upstream radiation problem is numerically more demanding because the wave lengths are much shorter when the sound waves propagate against a high speed mean flow. All acoustic duct modes at blade passing frequency f b were cut-off, the dominant cuton azimuthal modes were m ¼ 6 for f ¼ 2f b and m ¼ -10 for f ¼ 3f b .…”

Section: Flow Solvermentioning

confidence: 99%

Sound emission of a turbine stage due to an azimuthally periodic mean temperature

Mu¹,

Michel²,

Steger

et al. 2016

International Journal of Aeroacoustics

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It is shown in a 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. The tonal sound power emitted in the downstream direction is increased by 5.9 dB at the blade passing frequency fb and by 11.7 dB at 2fb. The mean total temperature of the incoming flow is assumed to vary periodically in the azimuthal direction with a temperature amplitude of ±9% as a result of 14 discrete burners inside the annular combustion chamber. The temperature also varies radially with minima at the inner and outer walls of the annular channel. The turbine stage consists of a stator with 70 vanes and a rotor with 73 blades, while the temperature field in the simulation has 14 periods in the circumference.

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Section: Flow Solvermentioning

confidence: 99%