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Effect of freestream turbulence on heat transfer and fluid flow in a transonic turbine stage

Mumic, Fadil LU and Sundén, Bengt LU (2006) 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
Abstract
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... (More)
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. In the present work, a numerical study has been performed to simulate the effect of free-stream turbulence on heat transfer and fluid flow in a transonic high-pressure turbine stage with tip clearance. The stator and rotor rows interact via a mixing plane, which allows the stage to be computed in a steady manner. The focus is on turbine aerodynamics and heat transfer behavior at the mid-span location, and at the rotor tip and casing region. The results of the fully 3D 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. (Less)
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organization
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Contribution to conference
publication status
published
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conference name
2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
external identifiers
  • Other:IMECE2006-13669
language
English
LU publication?
yes
id
e05dbf65-7198-4a7f-aa91-0ef9eaf546ec (old id 594114)
date added to LUP
2008-02-22 09:14:12
date last changed
2016-07-05 14:18:01
@misc{e05dbf65-7198-4a7f-aa91-0ef9eaf546ec,
  abstract     = {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. In the present work, a numerical study has been performed to simulate the effect of free-stream turbulence on heat transfer and fluid flow in a transonic high-pressure turbine stage with tip clearance. The stator and rotor rows interact via a mixing plane, which allows the stage to be computed in a steady manner. The focus is on turbine aerodynamics and heat transfer behavior at the mid-span location, and at the rotor tip and casing region. The results of the fully 3D 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.},
  author       = {Mumic, Fadil and Sundén, Bengt},
  language     = {eng},
  title        = {Effect of freestream turbulence on heat transfer and fluid flow in a transonic turbine stage},
  year         = {2006},
}