Fluid flow and surface heat transfer analysis in a three-pass trapezoidal blade cooling channel

摘要

The fluid-dynamic and heat transfer experimental analysis of a gas turbine internal three-gas blade cooling channel is presented. The passage is composed of three rectilinear channels joined by two sharp 180-degree turns; moreover, the channel section is trapezoidal instead of rectanglular configuration, already analysed in depth in the literature. The trapezoidal section is more representative of the actual geometrical configuration of the blade and, in comparison with the rectangular section, it shows significant aspect ratio and hyraulic diameter variations along the channel.