Heat Transfer Characteristics of an Aeroengine Turbine Casing Based on CFD and the Surrogate Model

A good turbine casing cooling design should control the thermal stress and maintain a reasonable tip clearance between blade casing. Since inlet temperature has been increased yearly, influence of radiation on become more significant. Therefore, heat transfer characteristics considering effect need to be precisely predicted. In this study, theoretical model is established for describing turbofan casing, model’s effectiveness verified by comparing numerical experimental results. Based validated model, effects single changes wall temperature, air Reynolds number, surface emissivity are discussed. The results show that increment leads enhancement average radiative Nusselt convective number increases as increases. can improve distribution uniformity Finally, Kriging surrogate fitted with 20 sample points predict joint multiple parameters number. It found significant compared ratio.