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Vol.3 , No. 4, Publication Date: Sep. 9, 2016, Page: 67-73
 and the span distance between two neighboring holes (S/D) are fixed with 8 and 3 respectively the attitude of the holes is fixed at inclination angle (θ = 30°). The blowing ratios, cold to hot air flow ratio, have been changed three times (BR= 0.5, 1.0, and 1.5) during the experimental program. The experimental investigation shows that the thermal performance increases as the holes density increases for all blowing ratios, and the film cooling effectiveness decreases as the blowing ratio increases for the two models.&picture=http://www.aascit.org/aascit/decorators/img/journal/896.jpg)
| [1] | Muwafaq Sh. Alwan, Computer Engineering, AL-Iraqia University, Baghdad, Iraq. |
| [2] | Humam K. Jalghaf, Mechanical Engineering, University of Technology, Baghdad, Iraq. |
| [3] | Reyadh Ch. Al-Zuhairy, Ministry of Higher Education and Scientific Research, Baghdad, Iraq. |
The present work concentrates the experimental investigation of effusion cooling performance for different holes density at different blowing ratio. The film cooling effectiveness and local heat transfer coefficient for difference holes density have been investigated on a flat plate. The investigations were done by using a single test transient IR thermography technique. Two models of staggered holes arrangement are investigated. The holes diameter is 2 mm for model 1 and 2 mm for model 2. The longitudinal distance (X/D) and the span distance between two neighboring holes (S/D) are fixed with 8 and 3 respectively the attitude of the holes is fixed at inclination angle (θ = 30°). The blowing ratios, cold to hot air flow ratio, have been changed three times (BR= 0.5, 1.0, and 1.5) during the experimental program. The experimental investigation shows that the thermal performance increases as the holes density increases for all blowing ratios, and the film cooling effectiveness decreases as the blowing ratio increases for the two models.
Keywords
Effusion Cooling, Blowing Ratio, Effectiveness, Holes Density
Reference
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