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- W2314092826 abstract "Heat Transfer in gas turbine blades, as a performance enhancing parameter, has gained high importance given the turbine inlet temperatures being above the safe operating point of the alloys used. One of the most effective techniques to achieve this heat transfer is through jet impingement using compressed air on the internal surface of the blade. Jet Impingement has high local heat transfer and is often used in the leading edge of gas turbine blades. As a balance between high local and average heat transfer is desired to balance thermal stresses and uniform surface temperatures, the flow in the impingement channel is modeled so as to get the most accurate predictions compared to a valid set of experimental data. Computational Fluid Dynamics will be used to simulate the flow conditions with an attempt to benchmark against a validated experimental data set. Different turbulence models will be compared to assess their ability in accurately and efficiently simulating the heat transfer processes within an impingement channel. Commercially available modern turbulence models, compared against experimental results from the literature, include Realizable k-, quadratic and cubic k-, k-, v 2 -f, EB k-. The geometry used was a 3x20 rectangular inline array with a jet to target distance of six diameters at a Reynolds number of 15000. The experiment was performed with an uncertainty of 12.3% for the heat transfer predictions. With an average Nusselt number of 55.54 which is about 19% off from the experimental data, the v 2 -f model best matches the experiment with the EB k- being the most accurate among the others. The trends in span wise and surface distribution of Nusselt number were appropriately captured with the stagnation region being prominent upstream eventually spreading over the surface downstream." @default.
- W2314092826 created "2016-06-24" @default.
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- W2314092826 date "2015-06-18" @default.
- W2314092826 modified "2023-09-26" @default.
- W2314092826 title "Evaluation of different Turbulence Models for analysis of Jet Impingement in Gas Turbine Blades" @default.
- W2314092826 cites W2021259095 @default.
- W2314092826 doi "https://doi.org/10.2514/6.2015-2812" @default.
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