图书馆订阅: Guest
TSFP DL Home 旧刊 执委

THREE-DIMENSIONAL FLOW STRUCTURE AND TURBULENCE MEASUREMENTS ABOUT A TRAILING EDGE FILM-COOLING BREAKOUT

Yude Chen
Department of Mechanical Engineering, Stanford University 488 Escondido Mall Building 500-501R, Stanford, California, 94305, USA

Claude G. Matalanis
Department of Mechanical Engineering, Stanford University 488 Escondido Mall Building 500-501R, Stanford, California, 94305, USA

John K. Eaton
Dept. of Mechanical Engineering Stanford University 488 Panama Mall Stanford, CA 94305 USA

Abstract

An experimental study is performed to examine the flow structure and turbulence about a model turbine blade trailing edge film-cooling breakout. A model consisting of a NACA 0012 airfoil modified to have a realistic trailing edge breakout was placed in a water tunnel. The breakout geometry is based on approximate measurements of several modern turbine blades. Reynolds number based on chord length is approximately 56,000. High resolution particle image velocimetry is performed to examine the flow field and turbulence about the breakout region. The results suggest that the geometry and cooling flow result in a highly three-dimensional flow in the immediate vicinity of the breakout. Also, the cooling flow significantly increases the turbulent kinetic energy immediately downstream of the breakout. All of this implies strong mixing between the mainstream flow and cooling flow that is likely responsible for degrading film-cooling effectiveness at the trailing edge.