Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage
Joint Authors
Wu, Pey-Shey
Tsai, Shen-Ta
Jhuo, Yue-Hua
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-01-28
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Medicine
Information Technology and Computer Science
Abstract EN
This study is concerned with a film cooling technique applicable to the protection of the endwalls of a gas turbine vane.
In the experiments, cross-injection coolant flow from two-row, paired, inclined holes with nonintersecting centerlines was utilized.
The test model is a scaled two-half vane.
The levels of turbulence intensity used in the experiments are T .
I .
= 1.8 %, 7%, and 12%.
Other parameters considered in the film cooling experiments include three inlet Reynolds numbers ( 9.20 × 10 4 , 1.24 × 10 5 , and 1.50 × 10 5 ) , three blowing ratios (0.5, 1.0, and 2.0), and three endwall conditions (smooth endwall and stepped endwall with forward-facing or backward-facing step).
Thermochromic liquid crystal (TLC) technique with steady-state heat transfer experiments was used to obtain the whole-field film cooling effectiveness.
Results show that, at low turbulence intensity, increasing Reynolds number decreases the effectiveness in most of the vane passage.
There is no monotonic trend of influence by Reynolds number at high turbulence intensity.
The effect of blowing ratio on the effectiveness has opposite trends at low and high turbulence levels.
Increasing turbulent intensity decreases the effectiveness, especially near the inlet of the vane passage.
With a stepped endwall, turbulence intensity has only mild effect on the film cooling effectiveness.
American Psychological Association (APA)
Wu, Pey-Shey& Tsai, Shen-Ta& Jhuo, Yue-Hua. 2014. Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage. The Scientific World Journal،Vol. 2014, no. 2014, pp.1-13.
https://search.emarefa.net/detail/BIM-1048923
Modern Language Association (MLA)
Wu, Pey-Shey…[et al.]. Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage. The Scientific World Journal No. 2014 (2014), pp.1-13.
https://search.emarefa.net/detail/BIM-1048923
American Medical Association (AMA)
Wu, Pey-Shey& Tsai, Shen-Ta& Jhuo, Yue-Hua. Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage. The Scientific World Journal. 2014. Vol. 2014, no. 2014, pp.1-13.
https://search.emarefa.net/detail/BIM-1048923
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1048923