抄録
Large Eddy Simulation (LES) of fully developed flow and heat transfer in a rectangular cooling channel with crossed angled ribs in a gas turbine blade was conducted. The target channel has square-sectional ribs with an angle-of-attack of 60 degrees, which were periodically mounted on the two opposite walls in crossed orientations. Calculations were carried out for three channels that aspect ratios were from 0.5 to 2.0. The numerical results suggest that augmentation of friction and heat transfer varies with the channel aspect ratio. As a result of having derived roughness function for mass and heat transfer from the predicted data, correlations for the friction and heat transfer were reached. The mass transfer correlation agreed well with a previous experiment of a square channel.
