Transport Phenomena - Delft University of Technology

Sorted by YearSorted by First Author

Effects of Rotation on Flow in an Asymmetric Rib-Roughened Duct: Les Study

Effects of Rotation on Flow in an Asymmetric Rib-Roughened Duct: Les Study, D. Borello, A. Salvagni, and K. Hanjalic. International Journal of Heat and Fluid Flow 2015, 55  (SI), 104–119.

Download

[DOI] 

Abstract

We report on large-eddy simulations (LES) of fully-developed asymmetric flow in a duct of a rectangular cross-section in which square-sectioned, equally-spaced ribs oriented perpendicular to the flow direction, were mounted on one of the walls. The configuration mimics a passage of internal cooling of a gas-turbine blade. The duct flow at a Reynolds number Re=15,000 (based on hydraulic diameter D-h, and bulk flow velocity U-0) was subjected to clock-wise (stabilising) and anti-clock-wise (destabilising) orthogonal rotation at a moderate rotational number Ro = Omega D-h/U-0 = 0.3, where Omega is the angular velocity. The LES results reproduced well the available experimental results of Coletti et al. (2011) (in the mid-plane adjacent to the ribbed wall) and provided insight into the whole duct complementing the reference Ply measurement. We analyzed the effects of stabilising and destabilising rotation on the flow, vortical structures and turbulence statistics by comparison with the non-rotating case. The analysis includes the identification of depth of penetration of the rib-effects into the bulk flow, influence of flow three-dimensionality and the role of secondary motions, all shown to be strongly affected by the rotation and its direction. (C) 2015 Elsevier Inc. All rights reserved.

BibTeX

@article{ ISI:000364732400012,
Author = {Borello, D. and Salvagni, A. and Hanjalic, K.},
Title = {Effects of Rotation on Flow in an Asymmetric Rib-Roughened Duct: Les Study},
Journal = {International Journal of Heat and Fluid Flow},
Year = {2015},
Volume = {55},
Number = {SI},
Pages = {104-119},
Month = {},
Abstract = {We report on large-eddy simulations (LES) of fully-developed asymmetric flow in a duct of a rectangular cross-section in which square-sectioned, equally-spaced ribs oriented perpendicular to the flow direction, were mounted on one of the walls. The configuration mimics a passage of internal cooling of a gas-turbine blade. The duct flow at a Reynolds number Re=15,000 (based on hydraulic diameter D-h, and bulk flow velocity U-0) was subjected to clock-wise (stabilising) and anti-clock-wise (destabilising) orthogonal rotation at a moderate rotational number Ro = Omega D-h/U-0 = 0.3, where Omega is the angular velocity. The LES results reproduced well the available experimental results of Coletti et al. (2011) (in the mid-plane adjacent to the ribbed wall) and provided insight into the whole duct complementing the reference Ply measurement. We analyzed the effects of stabilising and destabilising rotation on the flow, vortical structures and turbulence statistics by comparison with the non-rotating case. The analysis includes the identification of depth of penetration of the rib-effects into the bulk flow, influence of flow three-dimensionality and the role of secondary motions, all shown to be strongly affected by the rotation and its direction. (C) 2015 Elsevier Inc. All rights reserved.},
DOI = {10.1016/j.ijheatfluidflow.2015.07.012},
ISSN = {0142-727X},
EISSN = {1879-2278},
Unique-ID = {ISI:000364732400012},
}

Generated by bib2html.pl (written by Patrick Riley ) on Fri Jul 28, 2017 13:53:00


Last modified: July 28 2017. © Delft University of Technology - TP group 2012