Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Heat Transfer Research
Impact-faktor: 0.404 5-jähriger Impact-Faktor: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

Volumes:
Volumen 51, 2020 Volumen 50, 2019 Volumen 49, 2018 Volumen 48, 2017 Volumen 47, 2016 Volumen 46, 2015 Volumen 45, 2014 Volumen 44, 2013 Volumen 43, 2012 Volumen 42, 2011 Volumen 41, 2010 Volumen 40, 2009 Volumen 39, 2008 Volumen 38, 2007 Volumen 37, 2006 Volumen 36, 2005 Volumen 35, 2004 Volumen 34, 2003 Volumen 33, 2002 Volumen 32, 2001 Volumen 31, 2000 Volumen 30, 1999 Volumen 29, 1998 Volumen 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i7.40
pages 737-752

Turbine Airfoil Aerothermal Characteristics in Future Coal—Gas-Based Power Generation Systems

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

ABSTRAKT

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 those of conventional air-based gas turbines. The oxy-fuel cycle, with steam and CO2 as a 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 of 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.