Title: The requirements for the turbulence models in application to heat transfer analysis of turbine parts: the thermal stresses point-of-view
Authors: Kamil Banas
Addresses: Department of Energy Conversion, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14 St., Gdansk 80-231, Poland
Abstract: This paper investigates the requirements for turbulence models, in application to heat transfer simulation of turbine part, from a thermal stresses point-of-view. The investigation was based on thermal-fluid-structure interaction (thermal-FSI) analysis of the convectively-cooled turbine vane C3X, for which experimental heat transfer data is available and a laminar-turbulent transition occurs in the boundary layer. First, the production of turbulence energy at the stagnation point was investigated based on multiple turbulence models able to capture the transition phenomena. Next, the influence of turbulence modelling on thermal stresses was addressed. The stresses produced by experimental temperature field were compared with the modelled temperature-induced stresses. The presented results show that even relatively small discrepancies in temperature in an area where gradients of temperature are high can lead to large discrepancies in thermal stresses.
Keywords: requirements for turbulence models; turbulence modelling for turbine; thermal stresses; conjugate heat transfer analysis of turbine; laminar-turbulent transition; turbulence kinetic energy; stagnation point.
Progress in Computational Fluid Dynamics, An International Journal, 2020 Vol.20 No.4, pp.187 - 200
Received: 12 Nov 2018
Accepted: 22 Sep 2019
Published online: 15 Jul 2020 *