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Hybrid LES-RANS study of an effusion cooling array with circular holes
journal contribution
posted on 2019-02-14, 11:03 authored by Xiao-Sheng (Shaun) Chen, Hao XiaHao XiaIn this paper, a multi-row effusion cooling configuration with scaled gas turbine combustor conditions
is studied numerically. The distribution of the coolant film is examined by surface adiabatic cooling
effectiveness (ACE). Simulation results have shown that the accuracy of cooling effectiveness prediction
is closely related to the resolution of turbulent flow structures involved in hot-cold flow mixing, especially those close to the plate surface. The formation of the coolant film in the streamwise direction is
investigated. It is shown that the plate surface directly downstream the coolant holes are covered well
by the coolant jets, while surface regions in between the two columns of the coolant holes could not be
protected until the coolant film is developed sufficiently in the spanwise direction in the downstream region. More detailed study has also been carried out to study the time-averaged and time-dependent flow
field. The relation between the turbulent flow structures and coolant film distribution are also examined.
The Kelvin-Helmholtz instability in the upper and lower coolant jet shear layer, is found to have the
same frequency of around 8000Hz, and is independent of the coolant hole position. Additionally, it is
suggested by the spectral coherence analysis that those unsteady flow structures from the lower shear
layer are closely related to the near-wall flow temperature, and such effect is also independent of the
coolant hole position.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
International Journal of Heat and Fluid FlowCitation
CHEN, X-S. and XIA, H., 2019. Hybrid LES-RANS study of an effusion cooling array with circular holes. International Journal of Heat and Fluid Flow, 77 (June), pp. 171-185.Publisher
© Elsevier, Inc.Version
- AM (Accepted Manuscript)
Publisher statement
This paper was accepted for publication in the journal International Journal of Heat and Fluid Flow and the definitive published version is available at https://doi.org/10.1016/j.ijheatfluidflow.2018.09.014.Acceptance date
2018-09-21Publication date
2019-04-10ISSN
0142-727XPublisher version
Language
- en