Fluid flow and surface heat transfer analysis in a three‐pass trapezoidal blade cooling channel
Aircraft Engineering and Aerospace Technology
ISSN: 0002-2667
Article publication date: 1 April 1999
Abstract
The fluid‐dynamic and heat transfer experimental analysis of a gas turbine internal three‐pass 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 rectangular 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 hydraulic diameter variations along the channel. These variations have a strong impact on the flow field and the heat transfer coefficient distributions. The flow analysis experimental results ‐ wall pressure distributions, flow visualisations ‐ are presented and discussed. The heat transfer coefficient distributions, Nusselt enhancement factor, obtained using thermocromic liquid crystals (TLC), have been studied as well. In order to understand the influence of the cooling mass flow rate, a wide range of flow regimes ‐ Reynolds numbers ‐ has been considered.
Keywords
Citation
Cravero, C., Giusto, C. and Massardo, A.F. (1999), "Fluid flow and surface heat transfer analysis in a three‐pass trapezoidal blade cooling channel", Aircraft Engineering and Aerospace Technology, Vol. 71 No. 2, pp. 143-153. https://doi.org/10.1108/00022669910261592
Publisher
:MCB UP Ltd
Copyright © 1999, MCB UP Limited