APA
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Oro, J. F. F., Meana-Fernández, A., Vega, M. G., Pereiras, B., & Pérez, J. G. (2019). LES-based simulation of the time-resolved flow for rotor-stator interactions in axial fan stages. International Journal of Numerical Methods for Heat &Amp; Fluid Flow, 29(2), 657–681. https://doi.org/10.1108/HFF-10-2017-0421
Chicago/Turabian
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Oro, J. F. Fernández, A. Meana-Fernández, M. Galdo Vega, B. Pereiras, and José González Pérez. “LES-Based Simulation of the Time-Resolved Flow for Rotor-Stator Interactions in Axial Fan Stages.” International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 2 (2019): 657–681.
MLA
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Oro, J. F. Fernández, et al. “LES-Based Simulation of the Time-Resolved Flow for Rotor-Stator Interactions in Axial Fan Stages.” International Journal of Numerical Methods for Heat &Amp; Fluid Flow, vol. 29, no. 2, 2019, pp. 657–81, doi:10.1108/HFF-10-2017-0421.
BibTeX Click to copy
@article{j2019a,
title = {LES-based simulation of the time-resolved flow for rotor-stator interactions in axial fan stages},
year = {2019},
issue = {2},
journal = {International Journal of Numerical Methods for Heat & Fluid Flow},
pages = {657-681},
volume = {29},
doi = {10.1108/HFF-10-2017-0421},
author = {Oro, J. F. Fernández and Meana-Fernández, A. and Vega, M. Galdo and Pereiras, B. and Pérez, José González}
}
Purpose: The purpose of this paper is the development of a CFD methodology based on LES computations to analyze the rotor–stator interaction in an axial fan stage.
Design/methodology/approach: A wall-modeled large eddy simulation (WMLES) has been performed for a spanwise 3D extrusion of the central section of the fan stage. Computations were performed for three different operating conditions, from nominal (Q_N) to off-design (85 per cent Q_N and 70 per cent Q_N) working points. Circumferential periodic conditions were introduced to reduce the extent of the computational domain. The post-processing procedure enabled the segregation of unsteady deterministic features and turbulent scales. The simulations were experimentally validated using wake profiles and turbulent scales obtained from hot-wire measurements.
Findings: The transport of rotor wakes and both wake–vane and wake–wake interactions in the stator flow field have been analyzed. The description of flow separation, particularly at off-design conditions, is fully benefited from the LES performance. Rotor wakes impinging on the stator vanes generate a coherent large-scale vortex shedding at reduced frequencies. Large pressure fluctuations in the stagnation region on the leading edge of the vanes have been found.
Research limitations/implications: LES simulations have shown to be appropriate for the assessment of the design of an axial fan, especially for specific operating conditions for which a URANS model presents a lower performance for turbulence description.
Originality/value: This paper describes the development of an LES-based simulation to understand the flow mechanisms related to the rotor–stator interaction in axial fan stages.
Turbulence; Axial fan stage; Integral scales; LES modelling; Rotor-stator interaction; Time-resolved flow
