Session: 12-08 Effects of film cooling geometry on cooling performance (I)

Paper Number: 122560

122560 - Effect of Relative Location of Film Cooling Hole With Internal Angled Ribs on the Film Cooling Effectiveness of a Gas Turbine Blade 

In film cooling, relatively low temperature coolant is injected through small holes or slots on the surface of the components to be protected from hot combustion gas. Many studies have been conducted on film cooling for gas turbine blades operating at high-temperature and high-pressure conditions. The film cooling effectiveness is affected by the hole geometry, mainstream condition (turbulence intensity and boundary layer thickness), and coolant conditions (blowing ratio and density ratio). Researchers has focused on optimizing the geometry of fan-shaped holes or developing correlations at various coolant blowing ratio and density ratio conditions. It is also shown that the flow pattern of coolant at the inlet of the fan-shaped hole also affects film cooling effectiveness. In this study, inlet flow patterns resulting from the rib turbulators installed in the internal channel and its effects the film colling effectiveness was analyzed numerically. Studies were conducted at various relative locations of a fan shape holes on the 60-degree angled ribbed channel. Furthermore, the results were compared to cases that coolant was supplied through the plenum chamber. Results showed that the relative location of the film cooling hole with respect to the angled rib significantly altered the coolant flow through the hole and the distribution of film cooling effectiveness. Also, film cooling effectiveness for the case with angled ribbed channel generally showed lower film cooling effectiveness than that for the case with plenum chamber.

Presenting Author: Young Jun Kang Korea Aerospace University

Presenting Author Biography: Young Jun Kang is currently working on his doctoral degree from the School of Aerospace and Mechanical Engineering in the Korea Aerospace University, Goyang-si, Korea. He received his Master’s degree in Heat and Fluid Engineering from Korea Aerospace University. His research interests include aerodynamics, heat transfer, film cooling.

Authors:

Young Jun Kang Korea Aerospace University
Jin Young Jeong Korea Aerospace University
Hyeok Je Kim Korea Aerospace University
Gi Mun Kim Korea Aerospace University
Jae Su Kwak Korea Aerospace University