Abstract
In modern gas turbines, film cooling is the most common and efficient way to provide thermal protection for hot components. Secondary holes to a primary film cooling hole are used to improve film cooling performance by creating anti-kidney vortices, a technique that has been well documented using flat plate models. This study aims to evaluate the effects of secondary holes on film cooling effectiveness over an airfoil. The film cooling performance and flow fields of a row of primary holes with secondary holes on the pressure side and suction side of a C3X vane are numerically investigated and compared with the results of a single row of cylindrical holes and two rows of staggered cylindrical holes. Cases with different blowing ratios are analyzed. It is shown from the simulation that film cooling effectiveness of primary holes with secondary holes is much better than with a single row of cylindrical holes, and slightly better than with two rows of staggered holes on both pressure side and suction side, with the same amount of coolant usage and blowing ratio. The enhancement is higher on the pressure side than on the suction side. The results show that adding secondary holes can enhance film cooling effectiveness by creating anti-kidney vortices, which will weaken jet lift-off from the primary holes caused by the kidney vortex pair, especially at higher blowing ratios. In addition, film coverage of primary holes with secondary holes is wider and persists further downstream than for a single row of cylindrical holes.
| Original language | English (US) |
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| Title of host publication | ASME 2019 Heat Transfer Summer Conference, HT 2019, collocated with the ASME 2019 13th International Conference on Energy Sustainability |
| Publisher | American Society of Mechanical Engineers (ASME) |
| ISBN (Electronic) | 9780791859315 |
| DOIs | |
| State | Published - 2019 |
| Event | ASME 2019 Heat Transfer Summer Conference, HT 2019, collocated with the ASME 2019 13th International Conference on Energy Sustainability - Bellevue, United States Duration: Jul 14 2019 → Jul 17 2019 |
Publication series
| Name | ASME 2019 Heat Transfer Summer Conference, HT 2019, collocated with the ASME 2019 13th International Conference on Energy Sustainability |
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Conference
| Conference | ASME 2019 Heat Transfer Summer Conference, HT 2019, collocated with the ASME 2019 13th International Conference on Energy Sustainability |
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| Country/Territory | United States |
| City | Bellevue |
| Period | 7/14/19 → 7/17/19 |
Bibliographical note
Funding Information:This work was supported by the National Natural Science Foundation of China (51676163), by the National 111 Project under Grant no. B18041, by the Fundamental Research Funds of Shenzhen City of China (JCYJ20170306155153048), and by the Fundamental Research Funds of Shaanxi Province (2015KJXX-12). This work is also supported by China Scholarship Council (CSC). A part of this work was carried out using computing resources at the University of Minnesota Supercomputing Institute.
Publisher Copyright:
Copyright © 2019 ASME
Keywords
- C3X vane
- Film cooling
- Interaction of vortices]
- Secondary holes