NDLI: Simulation of Film Cooling Heat Transfer and Simulation Improvement With a Modified DES Turbulence Model

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Simulation of Film Cooling Heat Transfer and Simulation Improvement With a Modified DES Turbulence Model

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yu, Feiyan Yavuzkurt, Savas
Copyright Year	2018
Abstract	Modeling the heat transfer characteristics of the highly turbulent flow in gas turbine film cooling is important for better engineering solutions to the film cooling system design. URANS, LES, DES and modified DES models capability in simulating film cooling with a density ratio of 2.0 and blowing ratio of 1.0 are studied in this work. Detailed comparisons of simulation results with experimental data regarding the near-field and far-fields are made. For near field predictions, DES gives decent prediction with a 21.4 % deviation of centerline effectiveness, while LES and URANS have deviation of 33.6% and 51.2% compared to the experimental data. Despite good predictions for near field, DES under predicts the spanwise spreading of counter rotating vortex pair and temperature field, therefore it over predicts the centerline effectiveness in the far field. To compensate for this shortcoming of DES, the eddy viscosity in the spanwise direction is increased to enhance spanwise-diffusion of the cooling jets. The modified DES prediction of overall centerline effectiveness deviates 12.4% from experimental data, while LES, unmodified DES and URANS predictions deviate 10.8%, 31.9% and 46.9%. The modified DES model has adequate predictions of vortices evolutions which URANS modeling lacks and consumes significant less computational time than LES. It can be said that the modified DES model results in satisfactory film cooling modeling with a moderate computational cost and time.
File Format	PDF
ISBN	9780791852118
DOI	10.1115/IMECE2018-86887
Volume Number	Volume 8A: Heat Transfer and Thermal Engineering
Conference Proceedings	ASME 2018 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2018-11-09
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Viscosity Turbulence Temperature Cooling Modeling Density Diffusion (physics) Design Gas turbines Simulation results Simulation Vortices Eddies (fluid dynamics) Jets Film cooling Heat transfer
Content Type	Text
Resource Type	Article

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