Modal analysis of trailing edge cutback film cooling
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 20 December 2019
Issue publication date: 19 June 2020
Abstract
Purpose
The purpose of this paper devoted to the application of modal analysis to analyze the flow structure of trailing edge cutback film cooling and the effects of vortex structure on the film cooling effectiveness of the cutback surface.
Design/methodology/approach
Large eddy simulation (LES) is used to simulate the trailing edge cutback film cooling. The results of LES are analyzed by proper orthogonal decomposition (POD) method and dynamic mode decomposition (DMD) method. The POD method is used to determine the dominated vortex structure and the energy level of these structures. The DMD method is used to analyze the relationship between vortex structures and wall temperature.
Findings
The POD method shows that the flow field consists of three main vortices – streamwise vortex, lip vortex and coolant vortex. The DMD results show that the lip vortex mainly acts on the middle section of the cutback surface, while the streamwise vortex mainly acts on the back section of the cutback surface.
Research limitations/implications
The modal analysis is only based on numerical simulation but the modal analysis of experimental results will be further studied in the future.
Practical implications
This paper presents the powerful ability of the modal analysis method to study complex flows in trailing edge cutback film cooling. Establishing the relationship between vortex and wall temperature by modal analysis method can provide a new idea for studying convective heat transfer problems.
Originality/value
The role of streamwise vortex in the flow of the trailing edge cutback cooling and its effect on the cooling effectiveness of the cutback surface is found.
Keywords
Acknowledgements
The authors acknowledge financial support from the Natural Science Foundation of China (No. 51206034 and 51436002) and the Research Fund for the Doctoral Program of Higher Education of China (No. 20122302120066).
Citation
Luo, Y., Wen, F., Hou, R., Wang, S., Wang, S. and Wang, Z. (2020), "Modal analysis of trailing edge cutback film cooling", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 8, pp. 3957-3983. https://doi.org/10.1108/HFF-09-2019-0673
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited