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Convective Heat Transfer Inside Rotational Cascades With Flat Blades

DOI: 10.1615/ICHMT.2004.IntThermSciSemin.1010
pages 807-814

Mitja Mori
Laboratory for Heat and Power, Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, SI-1000, Ljubljana, Slovenija

Lovrenc Novak
University of Ljubljana, Faculty of Mech. Eng.

Mihael Sekavcnik
Laboratory for Heat and Power, Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, SI-1000, Ljubljana, Slovenija

Abstract

A numerical approach enabling studying the influence between rotational speed and convective heat transfer of bladed structure is presented. The investigated structure, which is cooled by air, was subjected to an axial hot-air stream in a cross-flow system. In order to exclude the influence of undesirable aerodynamic flow forces, a simplified geometry was chosen, and the influence of varying rotational speed was studied. The distributions of heat transfer rate on the hot side of the structure's wall were determined with CFD calculations. The non-uniformity of heat transfer increases with rotational speed due to the increasing impact of centrifugal flow forces on the boundary-layer thickness. The impact of rotational speed on the heat transfer rate was found not to be significant. The results of the studied structure were also used to validate various one-dimensional, semiempirical, convective heat transfer models that are commonly applied in engineering praxis. In all cases the flat wall heat transfer treatment showed the best agreement with the results of the CFD calculations. In order to verify the numerical and semiempirical model a test rig was installed, where the influence of rotation and coolant mass flow ratio on heat transfer can be studied.

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