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Flow and Heat Transfer Measurements of Film Injectant from a Row of Holes with Compound Angle Orientations  

Bumsoo Han (School of Mechanical & Aerospace Engineering, Seoul National University)
Sohn, Dong-Kee (School of Mechanical & Aerospace Engineering, Seoul National University)
Lee, Joon-Sik (School of Mechanical & Aerospace Engineering, Seoul National University)
Publication Information
Journal of Mechanical Science and Technology / v.16, no.9, 2002 , pp. 1137-1146 More about this Journal
Abstract
An experiment has been conducted on the flow and heat transfer characteristics of film coolant injected from a row of five holes with compound angle orientations of 35$^{\circ}$ inclination angle and 45$^{\circ}$ orientation angle. The Reynolds number based on the mainstream velocity and injection hole diameter 3.58${\times}$10$^4$. Three-dimensional velocity, film cooling effectiveness and heat transfer coefficient data are presented at three different mass flux ratios of 0.5, 1.0 and 2.0. Flow entrainment has been found between the vortices generated by adjacent injectants. The injectant with compound angle orientation entrains not only the mainstream boundary layer flow but also the adjacent injectant. Because of the flow entrainment, the injectant. With compound angle orientation is characterized by a single vortex while two bound vortices are usually observed in the case of simple angle injection. The strength of the secondary flow depends strongly on the mass flux ratio, which shows significant influence on the film cooling effectiveness and heat transfer coefficient.
Keywords
Film Cooling; Compound Angle Orientations; Mass Flux Ratio; Film Cooling Effectiveness; Heat Transfer Coefficient;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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