Accounting for Unsteady Interaction in Transonic Stages

TitleAccounting for Unsteady Interaction in Transonic Stages
Publication TypeJournal Article
Year of Publication2015
AuthorsRubechini F, Marconcini M, Giovannini M, Bellucci J, Arnone A
JournalASME Journal of Engineering for Gas Turbines and Power
Date Published05/2015
ISSN Number0742-4795
Accession NumberWOS:000352858700017
Other NumbersScopus 2-s2.0-84945242235
KeywordsCFD, Transonic Flows, Turbomachines, Unsteady Flows

This paper discusses the importance of the unsteady interaction in transonic turbomachinery stages. Although the flow in a turbomachine is inherently unsteady, most current calculations for routine design work exploit the steady-state assumption. In fact, unsteady flow effects are often taken into account for mechanical integrity checks, such as blade flutter or forced response, or heat transfer issues associated with circumferential non-uniformities, whereas steady-state calculations are usually selected for the aerodynamic design. In this work, some cases are discussed in which significant departures are found between steady and time-averaged results, and the basic fluid mechanisms responsible for them are examined. Finally, a current perspective of unsteady Computational Fluid Dynamics (CFD) calculations for the aerodynamic design is given.

Refereed DesignationRefereed