Influence on film cooling effectiveness of novel holes based on cylindrical configurations |
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| Authors: | Rui Zhu |
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| Affiliation: | 1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, Shaanxi, PR China;2. Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA |
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| 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. |
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