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AuthorShahina, Ibrahim
AuthorAlqaradawi, Mohamed
AuthorGadala, Mohamed
AuthorBadr, Osama
Available date2021-09-07T06:16:21Z
Publication Date2016
Publication NameJournal of Engineering and Applied Sciences
ResourceScopus
ISSN1816949X
URIhttp://dx.doi.org/10.3923/jeasci.2016.2769.2774
URIhttp://hdl.handle.net/10576/22824
AbstractThe reliability operation for small fuel cells and hybrid fuel cell with gas turbine requires centrifugal compressor surge prevention. This study concerns a high speed centrifugal compressor stage with different blade tip geometries. The investigations were performed with unsteady three-dimensional, compressible flow simulations. A novel parameterization method has been developed to alter the tip geometry of an impeller blade. Different tip geometries are investigated includes flat tip blade, main blade winglet, main and splitter blade winglet and finally pressure side grooved tip. The performance and internal flow results are presented at surge, design and near choke points. The conclusion is that the tip geometry has a significant effect on the compressor performance and the operation stability at lower flow rates. The pressure ratio and surge margin for the blades with winglet have been improved and decreased for the grooved tip geometry. More uniform flow at impeller outlet with winglet blade. The use of winglet tip displaces the tip leakage vortex away from the blade and weakening the impingement effect. The winglet tip reduce the aerodynamic losses by unloading the tip section, reducing the leakage flow rate and turning the leakage flow in a more stream wise direction. Medwell Journals, 2016.
SponsorThs publication was made possible by NPRP grant No. 4-651-2-242 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the researchers.
Languageen
PublisherMedwell Journals
SubjectBlade tip
Centrifugal compressor
Losses
Performance and stability
Surge
TitleEffect of blade tip geometry on centrifugal compressor performance and stability
TypeArticle
Pagination2769-2774
Issue Number12
Volume Number11
dc.accessType Abstract Only


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