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DR and RC wish to thank Industria de Turbopropulsores S.A.U. for allowing the publication of this paper and for its support during the project. This work has been carried-out under the RETOS project RTC1814120123 named ENVIDIA the grant from the Spanish Ministerio de Economia y Competitividad DPI2017-84700-R named AEROMOT.

Analysis of institutional authors

Romera, DavidCorresponding AuthorCorral, RoqueCorresponding Author

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Article

Efficient Passage-Spectral Method For Unsteady Flows Under Stall Conditions

Publicated to:Journal Of Turbomachinery-Transactions Of The Asme. 142 (12): - 2020-12-01 142(12), DOI: 10.1115/1.4047934

Authors: Romera, David; Corral, Roque;

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Abstract

This paper presents an efficient method of approximating unsteady flows using a block-wise 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 that 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 the effect of distorted inflow conditions has been used as verification case to demonstrate the effectiveness and viability of the method. The comparison between the passage-spectral method and the full-annulus solution shows that sound solutions can be obtained with a low number of harmonics. The new method has also been applied to investigate the rotating stall inception of the NASA rotor 67 for distorted inlet flows 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. This number heavily depends on the ratio between the number of retained harmonics to the number of blades.

Keywords

And operabilityCompressor stallComputational fluid dynamics (cfd)Fourier methodsSurge

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Journal Of Turbomachinery-Transactions Of The Asme due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2020, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Mechanical Engineering. Notably, the journal is positioned above the 90th percentile.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-06-01:

  • Google Scholar: 6
  • WoS: 1
  • Scopus: 3
  • OpenCitations: 3

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-06-01:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 11 (PlumX).

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (ROMERA HIJANO, DAVID) and Last Author (CORRAL GARCIA, ROQUE).

the authors responsible for correspondence tasks have been ROMERA HIJANO, DAVID and CORRAL GARCIA, ROQUE.