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TURBINE AIRFOIL AEROTHERMAL CHARACTERISTICS IN FUTURE COAL-GAS BASED POWER GENERATION SYSTEMS

DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst.80
14 pages

MinKing K. Chyu
Department of Mechanical Engineering and Materials Science University of Pittsburgh, Pittsburgh, PA 15261, USA

Mary Anne Alvin
National Energy Technology Laboratory, U.S. Department of Energy, Pittsburgh, PA 15236, USA

Abstract

Most promising operating cycles being developed for future coal-gas based systems are hydrogen-fired cycle and oxy-fuel cycle. Both cycles will likely have turbine working fluids significantly different from that of conventional air-based gas turbines. The oxyfuel cycle, with steam and CO2 as primary working fluid in the turbine section, will have a turbine inlet temperature target at approximately 1750 C, significantly higher than the current level of utility turbine systems. Described in this paper is a CFD-based simulation on the transport phenomena around the gas side of a turbine airfoil under realistic operating conditions of future coal-gas based systems. The relatively high concentration of steam in the oxy-fuel turbine leads to approximately 40% higher heat transfer coefficient on the airfoil external surface than its hydrogen-fired counterpart. This suggests that advances in cooling technology and thermal barrier coatings (TBC) are critical for the developments of future coal-based turbine systems. To further explore this issue, a comparative study on the internal cooling effectiveness between a double-wall or skin cooled arrangement and an equivalent serpentine-cooled configuration is performed. The contribution of thermal barrier coatings (TBC) toward overall thermal protection for turbine airfoil cooled under these two different cooling configurations is also evaluated.

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