| タイトル | Investigation of Spiral and Sweeping Holes |
| 本文（外部サイト） | http://hdl.handle.net/2060/20150015574 |
| 著者（英） | Shyam, Vikram; Thurman, Douglas; Ameri, Ali; Culley, Dennis; Poinsatte, Philip; Raghu, Surya |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2015-06-15 |
| 言語 | eng |
| 内容記述 | Surface infrared thermography, hotwire anemometry, and thermocouple surveys were performed on two new film cooling hole geometries: spiral/rifled holes and fluidic sweeping holes. The spiral holes attempt to induce large-scale vorticity to the film cooling jet as it exits the hole to prevent the formation of the kidney shaped vortices commonly associated with film cooling jets. The fluidic sweeping hole uses a passive in-hole geometry to induce jet sweeping at frequencies that scale with blowing ratios. The spiral hole performance is compared to that of round holes with and without compound angles. The fluidic hole is of the diffusion class of holes and is therefore compared to a 777 hole and Square holes. A patent-pending spiral hole design showed the highest potential of the non-diffusion type hole configurations. Velocity contours and flow temperature were acquired at discreet cross-sections of the downstream flow field. The passive fluidic sweeping hole shows the most uniform cooling distribution but suffers from low span-averaged effectiveness levels due to enhanced mixing. The data was taken at a Reynolds number of 11,000 based on hole diameter and freestream velocity. Infrared thermography was taken for blowing rations of 1.0, 1.5, 2.0, and 2.5 at a density ration of 1.05. The flow inside the fluidic sweeping hole was studied using 3D unsteady RANS. |
| NASA分類 | Fluid Mechanics and Thermodynamics; Aircraft Propulsion and Power |
| レポートNO | GT2015-43808
GRC-E-DAA-TN23414 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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