Abstract
In this study, four novel film cooling hole designs, all based on cylindrical holes, are numerically evaluated, and compared with those of a simple cylindrical hole and a laterally-diffused shaped hole. Film cooling effectiveness and surrounding thermal and flow fields are documented for operation with various blowing ratios. It is shown that the two-stage cylindrical hole can improve film cooling effectiveness at higher blowing ratios. The primary hole with two secondary holes can enhance film cooling performance by creating anti-kidney vortex pairs that will weaken jet liftoff caused by the kidney vortex pair that is created by the primary hole. The tri-circular shaped hole provides better film cooling effectiveness values only near the hole, but worse at downstream positions. The two-stage structure for the tri-circular shaped hole provides better film coverage because it changes the flow structure inside the delivery channel and decreases jet penetration into the passage flow.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 469-488 |
| Number of pages | 20 |
| Journal | Numerical Heat Transfer; Part A: Applications |
| Volume | 75 |
| Issue number | 7 |
| DOIs | |
| State | Published - Apr 3 2019 |
Bibliographical note
Publisher Copyright:© 2019, © 2019 Taylor & Francis Group, LLC.
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