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Transport Phenomena in Thermal Engineering. Volume 2

ISBN:
1-56700-015-0 (Print)

TURBINE COOLING: AN OVERVIEW AND SOME FOCUS TOPICS

D. E. Metzger
Mechanical and Aerospace Engineering Department, Arizona State University, Tempe, USA

Y. W. Kim
Mechanical and Aerospace Engineering Department, Arizona State University, Tempe, USA

Y. Yu
Mechanical and Aerospace Engineering Department, Arizona State University, Tempe, USA

Abstract

The overall goals and objectives of turbine cooling research are relatively unchanged from those pursued from the very beginning of the development of the gas turbine aeroengine, and now apply equally well to today's advanced stationary engine development. The development of both is still dictated by the very large turbine inlet temperature potential set by stoichiometric combustion, and by the underlying nature of both the hot gas and coolant flows as highly turbulent, highly three-dimensional, and highly geometry-dependent flows that have not yielded to general solutions. Thus, as new manufacturing techniques-and new aerodynamic advances dictate new geometries on both the hot gas and coolant sides, new solutions are necessary; and no general predictive techniques have evolved to easily provide them. A descriptive overview of turbine cooling methods and situations of current interest is given, followed by some specific examples of our own recent work and work in progress that is conducted to provide both better understanding of the convection heat transfer phenomena involved and information useful in turbine cooling design.