Memorias de investigación
Research Publications in journals:
Efficient Passage-Spectral Method For Unsteady Flows Under Stall Conditions
Year:2019

Research Areas
  • Theoric methods on mechanics fluids,
  • Turbomachinery

Information
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 which are present in many unsteady problems of industrial interest. 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 accurate 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. 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 to the number of blades.
International
Si
JCR
Si
Title
Journal of Turbomachinery-Transactions of the Asme
ISBN
0889-504X
Impact factor JCR
2,592
Impact info
Datos JCR del año 2018
Volume
10.1115/1.4047934
Journal number
From page
0
To page
0
Month
SIN MES
Ranking
Participants

Research Group, Departaments and Institutes related
  • Creador: Departamento: Mecánica de Fluidos y Propulsión Aeroespacial