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Film cooling science and technology for gas turbines: state-of-the-art experimental and computational knowledge - softcover - VKI LS 2007-06

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VKI LS 2007-06, Film cooling science and technology for gas turbines: state-of-the-art, ISBN 978-2-930389-76-1

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Film cooling science and technology for gas turbines: state-of-t

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Film cooling science and technology for gas turbines: state-of-the-art experimental and computational knowledge
April 16-20, 2007, edited by R.S. Bunker, T. Arts
Abstract

Film cooling in its various forms has become one of the most important and relied upon cooling techniques for the hot sections of propulsion and energy gas turbines.  Film cooling represents one of the few game changing technologies that has allowed the achievement of today’s high firing temperature, high efficiency gas turbine engines.  Because of its high importance and widespread application, research into the many aspects of film cooling has seen a tremendous increase in the last ten to fifteen years, with publications now exceeding 3000 in number. Further advances in film cooling performance levels, physics-based understanding of film-gas interactions, and the ability to accurately predict film cooling effects in real engines are all major requirements for the future goals of engine performance, life extension, and emissions reduction.  The objective of these Lecture Series proceedings is to present the state-of-the-art in both experimental knowledge and CFD-based computational predictions concerning gas turbine film cooling. The course notes are aimed at applied thermal-fluid and CFD researchers as well as gas turbine engine designers.

The LS begins with an overview of turbine engine design practices and applications for film cooling.  This introductory lecture also includes related aspects of film cooling inspection, manufacturing, and repair.  A significant portion of the LS is devoted to comprehensive reviews concerning the fundamentals of jet injection and mixing, the various key parametric effects and results for adiabatic effectiveness, heat transfer coefficients and discharge coefficients.  Each of these areas is treated for basic flat plate experimental knowledge of film cooling, as well as the more engine representative conditions of airfoil and endwall flow fields and interactions.  The main influencing factors of shape, orientation, density ratio, blowing ratio, and freestream effects are examined in detail.

The current and developing methods in computational predictions for film cooling are presented, including steady and unsteady RANS modelling, turbulence model capabilities, and large eddy / detached eddy simulations.  Special attention is given to very recent developments in the coupling of film models with experimental data.  The LS concludes with a summary of two challenging engine film cooling topics, blade tips and unsteady flow effects.  The LS provides a comprehensive and complete single source for understanding film cooling and a basis for future film technology advances.

Table of content
  • BUNKER, R.S. - General Electric Global Research Center, USA
    Turbine engine film cooling design and applications
    Turbine engine film cooling constraints
  • SIMON, T. W. - University of Minnesota, USA
    Fundamentals of coolant injection
    Discrete hole film cooling injection: mixing effects
    Effects of mainstream conditions
  • BOGARD, D.G. - University of Texas at Austin, USA
    Fundamentals of film effectiveness performance
    Geometric and flow influences on films effectiveness
    Specific airfoil film cooling configurations
  • BALDAUF, S.1 & SCHULZ, A.2 - 1WEBASTO AG & 2Universität Karlsruhe, Germany
    Flat plate film heat transfer coefficient augmentation
  • SAUMWEBER, C.1 & SCHULZ, A.2 - 1BEHR GmbH & Co. KG & 2Universität Karlsruhe, Germany
    Airfoil film heat transfer and effects of approach conditions
    Effects of film hole shaping and freestream conditions on heat transfer augmentation and discharge coefficients
  • ACHARYA, S. – Louisiana State University, USA
    Numerical modeling methods for film cooling
    Steady and unsteady rans film cooling predictions
  • ACHARYA, S. & TYAGI, M. – Louisiana State University, USA
    Direct numerical simulation (DNS) and large eddy simulation (LES) for film cooling
  • BURDET, A. - ETHZ - Swiss Federal Institute of Technology Zurich, Switzerland
    Film cooling models: coupling experimental observations with computational methods
  • BUNKER, R.S. - General Electric Global Research Center, USA
    Blade tip film cooling
    Turbine unsteady effects on film cooling

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Manufacturer von Karman Institute for Fluid Dynamics

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