Efficient passage-spectral method for unsteady flows under stall conditions

Romera Hijano, David and Corral Garcia, Roque (2019). Efficient passage-spectral method for unsteady flows under stall conditions. In: "SME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition", 17-21 jun, Phoenix, Arizona, USA. https://doi.org/10.1115/GT2019-91661.

Description

Title: Efficient passage-spectral method for unsteady flows under stall conditions
Author/s:
  • Romera Hijano, David
  • Corral Garcia, Roque
Item Type: Presentation at Congress or Conference (Article)
Event Title: SME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition
Event Dates: 17-21 jun
Event Location: Phoenix, Arizona, USA
Title of Book: ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition
Date: June 2019
Subjects:
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Matemática Aplicada a la Ingeniería Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper presents an efficient method of approximating unsteady flows using a blockwise discrete spatial Fourier series for the modeling of three-dimensional non-axisymmetric flows without making any hypothesis about its temporal periodicity. The method aims at capturing the long wavelength flow patterns which are present in many unsteady problems of industrial interest, such as compressor stability, with a drastic reduction in computational resources. The method is intended to be used to compute flows exhibiting large-scale instabilities and where the fundamental frequency of the problem is not known beforehand. The approach discretizes the domain using a finite number of blocks or passages, where the flow variables at the supposedly periodic boundaries are continuously updated using the spatial Fourier coefficients of a uniformly spaced set of reduced-passage domains. The NASA rotor 67 under stall conditions has been used as verification validation case to demonstrate the effectiveness and viability of the proposed modeling strategy. The comparison between the solutions obtained with the discrete Fourier series and the full-annulus solution shows that accurate solutions can be obtained with a low number of harmonics. The new method has been applied to investigate the rotating stall inception of the NASA rotor 67 for clean and distorted inlet flow near stall operating conditions. The method is shown to accurately reproduce the full-annulus solution with a few spatial harmonics, capturing the characteristic features of the complex flow induced by the tip leakage vortex breakdown. The computational cost in this application has been reduced by a factor of between three and seven, although this number heavily depends on the ratio between the number of retained harmonics and the number of blades.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainDPI2017-84700-RUnspecifiedUnspecifiedFenómenos aeromecánicos en motores de aviación
Universidad Politécnica de MadridP1614120148UnspecifiedUnspecifiedUnspecified

More information

Item ID: 57641
DC Identifier: https://oa.upm.es/57641/
OAI Identifier: oai:oa.upm.es:57641
DOI: 10.1115/GT2019-91661
Official URL: https://asmedigitalcollection.asme.org/turbomachinery/article-abstract/142/12/121007/1085781/Efficient-Passage-Spectral-Method-For-Unsteady?redirectedFrom=fulltext
Deposited by: Memoria Investigacion
Deposited on: 14 Dec 2021 12:48
Last Modified: 14 Dec 2021 12:48
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