Heat transfer analysis of two pass cooling channel of gas turbine blade with analytical wall function turbulence approach.

摘要

This paper reports experimental and computational studies of heat transfer through a square duct with a sharp 180 degree turn. The main purpose of this research was to study heat transfer predictions using the Analytical Wall-Function (AWF). To compare the predicting performance of the AWF, the standard Log-Law Based Wall-Function (LWF) and a Low-Reynolds-number (LRN) k-epsilon model were applied. Their results were also compared with experimental results for validation. In addition, three extended forms of the AWF were tested. The AWF showed better results than the conventional wall-function based on a logarithmic law especially in separation and reattachment regions and closer results to the LRN model's results. The extended forms of the AWF did not show significant differences from the results of the original form for the prediction of the whole region, although they showed to-some-extend changes in impinging and recirculation zones.