Heat transfer and flow characteristics of low aspect ratio pin-fins in cooling channel

Numerical simulation was conducted to investigate the heat transfer and flow characteristics of low aspect ratio cylinder pin-fins arrays in turbine blade trailing edge cooling channel, and analyze the action process of inlet Reynolds numbers and pin-fins spacing on cooling channel heat transfer and flow characteristics. The result shows that, with the increase of inlet Reynolds numbers, the channel wall heat transfer performance is improved effectively while the augmentation ability is gradually weakened, and the array pressure loss coefficient is reduced. For the two kinds of spacing, streamwise spacing is the main factor affecting the wall heat transfer performance, and with the decrease of streamwise spacing, the cooling channel heat transfer performance becomes better while reducing pressure loss coefficient; spanwise spacing is the dominant factor affecting cooling channel flow loss, which has an inverse relation between each other. In calculation of the cooling channel, average heat transfer performance of pin-fins is about 1.8 times of the endwall, and endwall heat transfer weight is approximately 0.824 times of the heat transfer area ratio, while this weight is nothing to do with inlet Reynolds numbers.