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Effect of free-stream 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
In the present work, a numerical study has been performed to simulate the effect of free-stream turbulence, length scale and variations in rotational speed of the rotor on heat transfer and fluid flow for 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 results available for the so-called MT1 turbine stage. The predicted heat transfer and static pressure distributions show reasonable agreement with the experimental... (More)
In the present work, a numerical study has been performed to simulate the effect of free-stream turbulence, length scale and variations in rotational speed of the rotor on heat transfer and fluid flow for 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 results available for the so-called MT1 turbine stage. The predicted heat transfer and static pressure distributions show reasonable agreement with the experimental data. In general, the local Nusselt number increases, at the same turbulence length scale, as the turbulence intensity increases, and the location of the suction side boundary layer transition moves upstream towards the blade leading edge. Comparison of the different length scales at the same turbulence intensity shows that the stagnation heat transfer was significantly increased as the length scale increased. However, the length scale evidenced no significant effects on blade tip or rotor casing heat transfer. Also, the results presented in this paper show that the rotational speed in addition to the turbulence intensity and length scale has an important contribution to the turbine blade aerodynamics and heat transfer. Copyright (Less)
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Boundary layer transition, Free stream turbulence, Rotational speed
host publication
American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
pages
9 pages
publisher
American Society Of Mechanical Engineers (ASME)
conference name
2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
conference location
Chicago, IL, United States
conference dates
2006-11-05 - 2006-11-10
external identifiers
  • scopus:84920631497
ISSN
0272-5673
ISBN
0791837904
language
English
LU publication?
yes
id
c1cc7c78-b788-4292-9e93-7233aa846fd2 (old id 616875)
date added to LUP
2016-04-01 16:06:06
date last changed
2021-06-23 03:59:51
@inproceedings{c1cc7c78-b788-4292-9e93-7233aa846fd2,
  abstract     = {In the present work, a numerical study has been performed to simulate the effect of free-stream turbulence, length scale and variations in rotational speed of the rotor on heat transfer and fluid flow for 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 results available for the so-called MT1 turbine stage. The predicted heat transfer and static pressure distributions show reasonable agreement with the experimental data. In general, the local Nusselt number increases, at the same turbulence length scale, as the turbulence intensity increases, and the location of the suction side boundary layer transition moves upstream towards the blade leading edge. Comparison of the different length scales at the same turbulence intensity shows that the stagnation heat transfer was significantly increased as the length scale increased. However, the length scale evidenced no significant effects on blade tip or rotor casing heat transfer. Also, the results presented in this paper show that the rotational speed in addition to the turbulence intensity and length scale has an important contribution to the turbine blade aerodynamics and heat transfer. Copyright},
  author       = {Mumic, Fadil and Sundén, Bengt},
  booktitle    = {American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD},
  isbn         = {0791837904},
  issn         = {0272-5673},
  language     = {eng},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Effect of free-stream turbulence on heat transfer and fluid flow in a transonic turbine stage},
  year         = {2006},
}