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ISSN: 2375-3897

American Journal of Energy and Power Engineering

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Effect of the Orientation Angle on Effusion Thermal Performance

American Journal of Energy and Power Engineering
Vol.3 , No. 3, Publication Date: Sep. 13, 2016, Page: 19-25

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Authors

[1]	Mowafaq S. 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.

Abstract

The present work concentrates the experimental investigation of effusion cooling performance for different holes direction 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 4mm, the longitudinal distance (X/D) is (5D), and the span distance between two neighboring holes (S/D) are 3D. The attitude of the holes is varied at inclination angle (θ = 30º) and the orientation angle (γ=0º) with (model 1) and opposite direction (θ = 30º, γ=180º) for (model 2) of hot main stream. 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, when the flow of coolant air and hot mainstream are in the same direction provides significant reduction of heat flux at all tested BR than that of the flow direction of the coolant air is opposite to the direction of hot mainstream.

Keywords

Effusion Cooling, Blowing Ratio, Effectiveness, Orientation Angle

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