G0801-1-4 Studies on Film Cooling of High Pressure Turbine Endwall with Leakage Flow

Abstract

This paper deals with experimental and computational studies on heat transfer characteristics of high-pressure turbine nozzle vanes with endwall film cooling under the influence of purge flow. Main goal of this study is to reveal the behavior of upstream leakage flow upon film-cooled endwall. This study presents measurement of film effectiveness and heat transfer coefficient on the endwall of first vane. The experiment is conducted using heated air as secondary air. The experimental technique is a transient method monitoring surface temperature rise using thermochromic liquid crystal coating on the surface. The experimental results show that film effectiveness increases the leading edge region of the endwall by increasing mass flow rate from 0.8% to 2.0%. However, the coolant cannot come at downstream region of the endwall.