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Heat transfer in high-pressure compressor gas turbine internal air systems: A arotating disc-cone cavity with axial throughflow

Alexiou, A, Hills, NJ, Long, C, Turner, AB and Millward, JA (2000) Heat transfer in high-pressure compressor gas turbine internal air systems: A arotating disc-cone cavity with axial throughflow Experimental Heat Transfer, 13 (1-4). pp. 299-328.

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Abstract

This article reports on heat transfer measurements made on a rotating test rig representing the internal disc-cone cavity of a gas turbine high-pressure (H.P.) compressor stack. Tests were carried out for a range of flow rates and rotational speeds at engine representative nondimensional conditions. The rig also had a central drive shaft, which could rotate in the same direction as the discs, contrarotate relative to the discs, or remain static. Measurements of heat transfer were obtained from a conduction solution method using measured surface temperatures as boundary conditions. Results from the outer surface of the cone are in reasonable agreement with theoretical predictions for the heat transfer from a free cone in turbulent flow. The heat transfer measurements from the inner surface of the cone reveal two regimes of heat transfer: one governed by rotation, the other by action of the throughflow. In the rotationally dominated regime, the heat transfer from the inner surface of the cone is higher for a co-rotating shaft than for either a static or contra-rotating shaft. In the throughflow-dominated regime the heat transfer shows little consistent dependence on the direction of shaft rotation. Tests carried out at different values of surface-to-fluid temperature difference add support to the hypothesis that in the rotationally dominated regime the heat transfer occurs through a process of free convection, where the buoyancy force is induced by rotation. The heat transfer from the disc is significantly lower than that from the inner surface of the cone and more or less insensitive to the sense of shaft rotation. The disc average Nusselt numbers show similar behavior to those from the inner surface of the cone and suggest that the disc heat transfer too is governed either by rotationally induced buoyancy or by the axial throughflow.

Item Type: Article
Authors :
NameEmailORCID
Alexiou, AUNSPECIFIEDUNSPECIFIED
Hills, NJn.hills@surrey.ac.ukUNSPECIFIED
Long, CUNSPECIFIEDUNSPECIFIED
Turner, ABUNSPECIFIEDUNSPECIFIED
Millward, JAUNSPECIFIEDUNSPECIFIED
Date : 1 October 2000
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:16
Last Modified : 17 May 2017 15:02
URI: http://epubs.surrey.ac.uk/id/eprint/834677

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