Colloquium: Edgars Daugulis (C&O)

27 juni 2022 13:30 - Locatie: Lecture Room F, FACULTY OF AEROSPACE ENGINEERING, KLUYVERWEG 1, DELFT | Zet in mijn agenda

Numerical study of gas turbine nozzle guide vane external heat transfer and showerhead film cooling effectiveness by means of hybrid RANS-LES CFD modelling

A gas turbine nozzle guide vane is a component exposed to extreme temperatures in high-pressure gas turbines. An accurate estimation of the guide vane metal temperature on its surface is crucial for predicting vane lifetime. The stagnation region at the leading edge is, typically, exposed to the highest thermal load, thus, the showerhead configuration of film cooling is often applied. CFD simulations of a non-cooled vane are first performed to validate heat transfer results to experimental data. Then, the film cooling effectiveness in the leading edge region is investigated numerically with different swirling inflow profiles specified. A hybrid RANS-LES model is implemented in the study. The benefits of hybrid modelling are established as compared to the computationally less expensive RANS models that are still the standard in the industry. The results show the swirling inflow leading to a shifted stagnation line and reduction in the average film cooling effectiveness.

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