<p style="text-align: justify">Gas turbine endwall is bearing extreme thermal load with the rapid increase of turbine inlet temperature. Therefore, the effective cooling of turbine endwall is of vital importance for the safe operation of turbine. In the design of endwall cooling layout, numerical simulations based on conjugate heat transfer (CHT) is drawing more attention as the component temperature could be predicted directly. However, the computation cost of high-fidelity CHT analysis can be high and even prohibitive especially when there are many cases to evaluate such as in the design optimization of cooling layout. In this study, we establish a multi-fidelity framework in which the data of low-fidelity CHT analysis is employed to help the building of a model that predict the result of high-fidelity simulation. Based upon this framework, multi-fidelity design optimization of a validated numerical turbine endwall model is carried out. In the optimization, the positions of the film cooling holes are parameterized and controlled by a shape function. The high and low fidelity data are obtained from the computation of full model with fine mesh and simplified model with coarse mesh respectively. With the help of multi-fidelity modelling and sequentially evaluated design, the overall effectiveness of conjugate film cooling is improved.</p>

Improving the Film Cooling Performance of a Turbine Endwall With Multi-Fidelity Modelling Considering Conjugate Heat Transfer

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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