Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage
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...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2014-01-01
|
| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/256136 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832558770299863040 |
|---|---|
| author | Pey-Shey Wu Shen-Ta Tsai Yue-Hua Jhuo |
| author_facet | Pey-Shey Wu Shen-Ta Tsai Yue-Hua Jhuo |
| author_sort | Pey-Shey Wu |
| collection | DOAJ |
| description | 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 (9.20×104 , 1.24×105, and 1.50×105), 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. |
| format | Article |
| id | doaj-art-feee276b2fe24e3fa7696e3017b25d39 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-feee276b2fe24e3fa7696e3017b25d392025-02-03T01:31:46ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/256136256136Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane PassagePey-Shey Wu0Shen-Ta Tsai1Yue-Hua Jhuo2Department of Mechanical and Automation Engineering, Da-Yeh University, 168 University Road, Dacun, Changhua 51591, TaiwanDepartment of Mechanical and Automation Engineering, Da-Yeh University, 168 University Road, Dacun, Changhua 51591, TaiwanDepartment of Mechanical and Automation Engineering, Da-Yeh University, 168 University Road, Dacun, Changhua 51591, TaiwanThis 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 (9.20×104 , 1.24×105, and 1.50×105), 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.http://dx.doi.org/10.1155/2014/256136 |
| spellingShingle | Pey-Shey Wu Shen-Ta Tsai Yue-Hua Jhuo 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 |
| title | Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage |
| title_full | Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage |
| title_fullStr | Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage |
| title_full_unstemmed | Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage |
| title_short | Effect of Turbulence Intensity on Cross-Injection Film Cooling at a Stepped or Smooth Endwall of a Gas Turbine Vane Passage |
| title_sort | effect of turbulence intensity on cross injection film cooling at a stepped or smooth endwall of a gas turbine vane passage |
| url | http://dx.doi.org/10.1155/2014/256136 |
| work_keys_str_mv | AT peysheywu effectofturbulenceintensityoncrossinjectionfilmcoolingatasteppedorsmoothendwallofagasturbinevanepassage AT shentatsai effectofturbulenceintensityoncrossinjectionfilmcoolingatasteppedorsmoothendwallofagasturbinevanepassage AT yuehuajhuo effectofturbulenceintensityoncrossinjectionfilmcoolingatasteppedorsmoothendwallofagasturbinevanepassage |