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AuthorIbrahim, Shahin
AuthorAlqaradawi, Mohamed
AuthorGadala, Mohamed
AuthorBadr, Osama
Available date2024-01-18T10:04:28Z
Publication Date2016-11-11
Publication NameAerospace Science and Technology
Identifierhttp://dx.doi.org/10.1016/j.ast.2016.10.031
CitationShahin, I., Alqaradawi, M., Gadala, M., & Badr, O. (2017). On the aero acoustic and internal flows structure in a centrifugal compressor with hub side cavity operating at off design condition. Aerospace Science and Technology, 60, 68-83.
ISSN1270-9638
URIhttps://www.sciencedirect.com/science/article/pii/S1270963816309920
URIhttp://hdl.handle.net/10576/50913
AbstractThis paper covers the characterization of the acoustic noise and the unsteady flow field of a high speed centrifugal compressor NASA CC3. In order to accurately predict the noise, all analyses are carried out through the use of Large Eddy Simulation and Ffowcs Williams–Hawkings model for noise prediction. The relative effect of hub cavity on flow characteristics and sound levels is investigated, for a compressor stage with a total pressure ratio equal to 4, working from surge to near choke condition. In comparison with the experimental results from literature, the predicted compressor performance and flow field are predicted well, some trends seen in experiments are captured. The hub cavity flow effect on the compressor aero acoustic generated noise is shown in the paper. The unsteady static pressure and sound pressure levels are compared not only at different location but also for design and off design operating points. The internal flow results inside the hub cavity are presented at surge, design and near choke points. The conclusion is that the cavity effect of the centrifugal compressor cannot be ignored in the numerical prediction of aerodynamic generated noise. The impeller back plate of the rotor experiences a strong pressure fluctuation, which is maxima at the impeller outer radius for all operating point, but higher pressure values at the surge point.
SponsorThis publication was made possible by NPRP grant No. 4-651-2-242 from the Qatar National Research Fund (a member of Qatar Foundation).
Languageen
PublisherElsevier
SubjectAero-acoustic
LES
Centrifugal compressor
Hub side cavity and surge
TitleOn the aero acoustic and internal flows structure in a centrifugal compressor with hub side cavity operating at off design condition
TypeArticle
Pagination68-83
Volume Number60
ESSN1626-3219
dc.accessType Open Access


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