Improvements to gas turbine efficiency depend closely on cooling technologies,
as efficiency increases with turbine inlet temperature. To aid in this process, simulations that consider real engine conditions need to be considered. The first step
towards this goal is a benchmark study using direct numerical simulations to consider
a single periodic film cooling hole that characterizes the error in adiabatic boundary
conditions, a common numerical simpliflication. Two cases are considered: an adiabatic case and a conjugate case. The adiabatic case is for validation to previous work
conducted by Pietrzyk and Peet. The conjugate case considers heat transfer in the
solid endwall in addition to the
fluid, eliminating any simplified boundary conditions.
It also includes an impinging jet and plenum, typical of actual endwall configurations.
The numerical solver is NEK5000 and the two cases were run at 504 and 128 processors for the adiabatic and conjugate cases respectively. The approximate combined
time is 100,000 CPU hours. In the adiabatic case, the results show good agreement
for average velocity profiles but over prediction of the film cooling effectiveness. A
convergence study suggests that there may be an area of unresolved flow, and the film cooling momentum flux may be too high. Preliminary conjugate results show
agreement with velocity profiles, and significant differences in cooling effectiveness.
Both cases will need to be refined near the cooling hole exit, and another convergence
study done. The results from this study will be used in a larger case that considers
an actual turbine vane and film cooling hole arrangement with real engine conditions.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2010-12-8952 |
| Date | 2010 December 1900 |
| Creators | Meador, Charles Michael |
| Contributors | Duggleby, Andrew |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | application/pdf |
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