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 CFD calculations for the aerodynamic design is given.

Accounting for Unsteady Interaction in Transonic Stages / Filippo Rubechini; Michele Marconcini; Matteo Giovannini; Juri Bellucci; Andrea Arnone. - In: JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. - ISSN 0742-4795. - ELETTRONICO. - 137:(2015), pp. 052602-1-052602-9. [10.1115/1.4028667]

Accounting for Unsteady Interaction in Transonic Stages

RUBECHINI, FILIPPO;MARCONCINI, MICHELE;GIOVANNINI, MATTEO;BELLUCCI, JURI;ARNONE, ANDREA
2015

Abstract

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 CFD calculations for the aerodynamic design is given.
2015
137
052602-1
052602-9
Goal 7: Affordable and clean energy
Filippo Rubechini; Michele Marconcini; Matteo Giovannini; Juri Bellucci; Andrea Arnone
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/827483
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