M. Effendy
DES study of blade trailing edge cutback cooling performance with various lip thicknesses
Effendy, M.; Yao, Y. F.; Yao, Jun; Marchant, D. R.
Authors
Yufeng Yao Yufeng.Yao@uwe.ac.uk
Professor in Aerospace Engineering
Dr Jun Yao Jun.Yao@uwe.ac.uk
Senior Lecturer Aerospace Themofluids
D. R. Marchant
Abstract
© 2015 Elsevier Ltd. All rights reserved. Three-dimensional detached-eddy simulation (DES) study has been carried out to evaluate the cooling performance of a trailing-edge cutback turbine blade with various lip thickness to slot height ratios (t/H). By adopting the shear-stress transport (SST) k-ω turbulence model, the numerical investigations were performed at two successive steps: first, to validate simulation results from an existing cutback turbine blade model with staggered circular pin-fins arrays inside the cooling passage against experimental measurements and other available numerical predictions; second, to understand the effects of the lip thickness to the slot height ratio on the blade trailing-edge cooling performance. It was found from the model validations that at two moderate blowing ratios of 0.5 and 1.1, DES predicted film cooling effectiveness are in very good agreement with experimental data. Further comparisons of four various t/H ratios (t/H=0.25, 0.5, 1.0, 1.5) have revealed that the thermal mixing process between the 'cold' coolant gas and the 'hot' mainstream flow in the near wake region of the exit slot has been greatly intensified with the increase of the t/H ratio. As a result, it causes a rapid decay of the adiabatic film cooling effectiveness downstream of the blade trailing-edge. The observed vortex shedding and its characteristics in the near wake region are found to play an important role in determining the dynamic process of the 'cold' and the 'warm' airflow mixing, which in turn have significant influences on the prediction accuracy of the near-wall heat transfer performance. As the four t/H ratio increases from 0.25 to 1.5, DES predicts the decrease of main shedding frequencies as fs=3.69, 3.2, 2.21, and 1.49 kHz, corresponding to Strouhal numbers St=0.15, 0.20, 0.23, and 0.22, respectively. These results are in good agreement with available experimental measurements.
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 23, 2015 |
Publication Date | Apr 25, 2016 |
Deposit Date | Feb 4, 2016 |
Publicly Available Date | Jan 29, 2017 |
Journal | Applied Thermal Engineering |
Print ISSN | 1359-4311 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 99 |
Pages | 434-445 |
DOI | https://doi.org/10.1016/j.applthermaleng.2015.11.103 |
Keywords | detached-eddy simulation, effects of lip thickness to slot height ratio, thermal mixing process, blade trailing-edge cutback cooling |
Public URL | https://uwe-repository.worktribe.com/output/914755 |
Publisher URL | http://dx.doi.org/10.1016/j.applthermaleng.2015.11.103 |
Contract Date | Apr 7, 2016 |
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