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Numerical simulation of unsteady fluid flow and heat transfer in a transonic turbine stage

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Author

Summary, in English

With the attempts to increase power, efficiency and thrust, modern gas turbines operate with combustor outlet temperatures of 1800-2000 K, which are far beyond the allowable metal temperatures. Turbine blades are exposed to these high temperature gases and may undergo severe thermal stress and fatigue. Thus, in order to develop optimal cooling strategies and reduce the heat transfer it is important to obtain a good understanding of both the complex flow field and the heat transfer characteristics in a turbine rotor/stator hot-gas passage. In the past decade computational fluid dynamics (CFD) have started to play an increasingly important role and be an effective tool in the study and analysis of complex flow and the design of more efficient machinery components. The simulation of gas flow in turbomachines are challenging because of the complicated rotating geometries and unsteady flow nature. Modern turbomachinery operates under extremely complex three-dimensional and turbulent flow conditions, and it is difficult to accurately predict the heat loads on the blades. The objective of this work is to understand the unsteady flow field and heat transfer in a single transonic turbine stage using an unsteady quasi-3D structured Navier-Stokes solver. For the time accurate computation, a fully implicit time discretization, dual-time stepping, is performed. The results of the CFD simulations are compared with experimental heat transfer and aerodynamic results available for the so-called MT1 turbine stage. The predicted heat transfer and static pressure distributions show reasonable agreement with experimental data.

Department/s

Publishing year

2006

Language

English

Document type

Conference paper

Topic

  • Energy Engineering

Conference name

2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006

Conference date

2006-11-05 - 2006-11-10

Conference place

Chicago, IL, United States

Status

Published

Research group

  • heat transfer

ISBN/ISSN/Other

  • IMECE2006-13668