Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Heat Transfer Research
Facteur d'impact: 0.404 Facteur d'impact sur 5 ans: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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

RÉSUMÉ

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.