Abstract
As follow-up work of an experimental investigation performed by Raitor and Neise (J Sound Vib 314:738–756, 2008) [1] from 2001–2006, a numerical study using the unsteady RANS code for turbomachinery applications from the DLR (TRACE, Ashcroft et al., J Turbomach 136:021002, 2013 [2]) was performed by the University of Aachen (RWTH) and thoroughly analysed in collaboration with the Technical University of Berlin (TUB). Raitor and Neise were discriminating dominating noise source mechanisms in different frequency ranges both on the suction and the pressure side of the investigated radial compressor setups. Their elaborated work was focussed on the suction side of the experiment. In contrast to the suction side, where Raitor and Neise installed a multitude of microphones that allowed for a sound field decomposition into circumferential modes as well as—utilising the ISO 5136 methodology—the determination of the sound power, the pressure side was equipped with just a few microphones providing only spectral but no spatial information nor the sound power of the excited compressor sound field. In order to gain more insight into the sound propagation to the pressure side of radial compressors, the dominant tonal components of the conducted numerical study were acoustically analysed in terms of their radial mode constituents and the downstream transmitted sound power. The ongoing research is a first step towards the deeper physical understanding of the dominant constituents of sound fields propagating into the downstream ducts of radial compressors.
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Acknowledgements
The authors gratefully acknowledge the computing time granted by the JARA-HPC Vergabegremium and provided on the JARA-HPC partitions part of RWTH Claix Cluster in Aachen. Also the funding by the Research Association for Combustion Engines e.V. and the German Research Foundation is highly appreciated.
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Enghardt, L., Faßbender, A., Hurst, J. (2019). Sound Sources of Radial Compressors—A Numerical Study on the Outlet Side. In: Ciappi, E., et al. Flinovia—Flow Induced Noise and Vibration Issues and Aspects-II. FLINOVIA 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-76780-2_5
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DOI: https://doi.org/10.1007/978-3-319-76780-2_5
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