Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Full metadata record
DC FieldValueLanguage
dc.contributor.authorZhang, X.-
dc.contributor.authorZeng, W.-
dc.contributor.authorCheng, Y.-
dc.contributor.authorYang, Z.-
dc.contributor.authorChen, Q.-
dc.contributor.authorYang, J.-
dc.identifier.citationJournal of Fluids Engineering, 2019; 141(12):121104-1-121104-13-
dc.description.abstractThe pressure pulsations in the vaneless space of pump-turbines are extremely intense and always experience rapid time variations during transient scenarios, causing structural vibrations and even more serious accidents. In this study, the mechanism behind the rapid time variations of the vaneless space pressure pulsations in a model pump-turbine during runaway was analyzed through three-dimensional (3D) numerical simulations. These results show that the high-frequency pressure pulsation components originating from rotor–stator interactions (RSI) are dominant during the whole process. These components fluctuate significantly in frequency when the working point goes through the S-shaped region of the characteristic curve, with the amplitudes increasing. Meanwhile, some low-frequency pulsations are also enhanced and become obvious. These features can be attributed to the transitions of the inter blade vortex structures (IBVSs) to the forward flow vortex structures (FFVSs) and the back flow vortex structures (BFVSs) at the impeller entrance, when the pump-turbine operates in the region with S-shaped characteristics. The FFVSs mainly cause decreases in frequency and introduce low-frequency pulsations, while the BFVSs are responsible for the unstable fluctuations. These findings contribute to the understanding of how transient flow patterns evolve and may provide new ideas about avoiding severe pressure pulsations caused by rotating stalls in the pump-turbine during transient scenarios.-
dc.description.statementofresponsibilityXiaoxi Zhang, Wei Zeng, Yongguang Cheng, Zhiyan Yang, Qiuhua Chen, Jiandong Yang-
dc.publisherAmerican Society of Mechanical Engineers-
dc.rightsCopyright © 2019 by ASME-
dc.titleMechanism of fast transition of pressure pulsations in the vaneless space of a model pump-turbine during runaway-
dc.typeJournal article-
dc.identifier.orcidZeng, W. [0000-0003-3525-0432]-
Appears in Collections:Aurora harvest 8
Civil and Environmental Engineering publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.