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research-article

Study of the Effect of the Scatter of Acoustic Modes on Turbine Flutter

[+] Author and Article Information
Juan Manuel Gallardo

Francisca Delgado, 9 Alcobendas, Madrid 28108 Spain juan.gallardo@itpaero.com

Adrián Sotillo

Francisca Delgado, 9 Alcobendas, Madrid 28108 Spain adrian.sotillo@itpaero.com

Óscar Bermejo

Francisca Delgado, 9 Alcobendas, Madrid 28108 Spain oscar.bermejo@itpaero.com

1Corresponding author.

Manuscript received October 29, 2018; final manuscript received May 13, 2019; published online xx xx, xxxx. Assoc. Editor: Li He.

ASME doi:10.1115/1.4043909 History: Received October 29, 2018; Accepted May 13, 2019

Abstract

The prediction of aerodynamic damping is a relevant issue for turbomachinery design trends. Most of the conventional analysis methodologies for the study of aeroelastic forcing in use until recently neglect any hypothetical effects of adjacent rows. However, in recent years it has become unquestionable that acoustic waves and nearly-convected perturbations reflected in neighboring rows play a significant role in the evaluation of the overall unsteady loading of the blades.

In this paper a study of the impact of these effects in flutter stability margin is performed. For this analysis, ITP Aero's in-house unsteady 3D frequency-domain linearized RANS solver is used. The subject of this research is a setup which is a close representation of a proper LPT geometry. The influence of neighboring rows is examined, taking into consideration how the interactions between rows are scattered into several circumferential modes, as well as into radial modes. A quantitative assessment of all these effects is performed to understand the relative relevance of each one of them, and the results of unsteady aerodynamic blade loading are compared to those of a single-row simulation.

Copyright © 2019 by ASME
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