The Proceedings of the Thermal Engineering Conference
Online ISSN : 2424-290X
2012
Session ID : E142
Conference information
E142 Film Cooling Performance over Dimpled Cutback Surface Measured by Transient Technique with Compensation of Three-Dimensional Heat Conduction
Hajime KonishiAkira MurataHiroshi SaitoKaoru IwamotoYoji Okita
Author information
CONFERENCE PROCEEDINGS FREE ACCESS

Details
Abstract
Cooling at trailing edge of gas turbine airfoil is one of the most difficult problems because of its thin shape: high thermal load from both surfaces, hard-to-cool geometry of narrow passages, and at the same time demand for structural strength. In this study, heat transfer experiments by using transient technique were performed for cutback surfaces with three types of dimples (spherical, teardrop, and 45deg angled teardrop). The present results clearly showed the precise distribution of local film cooling effectiveness and Nusselt number. Although overall film cooling effectiveness was almost same among three dimpled surfaces, overall Nusselt number of teardrop and 45deg angled teardrop cases were larger than those of spherical dimple. As a result, film cooling performance of teardrop case was the highest of all.
Content from these authors
© 2012 The Japan Society of Mechanical Engineers
Previous article Next article
feedback
Top