Aerodynamic comparison and validation of rans, K-ω, standard K-ɛ and URANS simulations of flat plate film-cooling
Film cooling has been extensively used to provide thermal protection for the external surfaces of gas turbine components. For the past 40 years, numerous number of film cooling hole designs and arrangements have been introduced. Due to broad designs and arrangements of film cooling, numerical...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1629/1/24p%20OSAMA.%20H.%20ABDULGUAD.pdf http://eprints.uthm.edu.my/1629/2/OSAMA.%20H.%20ABDULGUAD%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1629/3/OSAMA.%20H.%20ABDULGUAD%20WATERMARK.pdf |
| Summary: | Film cooling has been extensively used to provide thermal protection for the
external surfaces of gas turbine components. For the past 40 years, numerous number
of film cooling hole designs and arrangements have been introduced. Due to broad
designs and arrangements of film cooling, numerical investigation has been utilized
to provide initial insight on the aerodynamics and thermal performance of the new
film cooling designs or arrangements. The present work focuses on the numerical
investigation of RANS and URANS analyses on a flat plate film cooling. The
investigation aims to provide comparison between various turbulent models available
for the Reynolds Average Navier Stokes (RANS) analyses and extended to unsteady
Reynolds Average Navier Stokes (URANS). The numerical investigations make
used of ANSYS CFX ver. 14 and were carried out at Reynolds Number, Re = 7,000
based on the hole diameter at blowing ratio, BR = 0.5. The results of the RANS
analyses show significant influence of the turbulent models on the predicted
aerodynamics and thermal performance of the film cooling. Qualitative comparison
between the simulation and experimental results shows that standard k-ε produces
more accurate results from the other considered turbulent models. In addition to that,
results of URANS indicate limitation of RANS analyses to provide details on the
eddied and vortices formation in film cooling flow structure. |
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