Flow Measurements inside a Heated Multiple Rotating Cavity with Axial Throughflow

Long, C A, Miche, N D D and Childs, P R N (2007) Flow Measurements inside a Heated Multiple Rotating Cavity with Axial Throughflow. International Journal of Heat and Fluid Flow, 28 (6). pp. 1391-1404. ISSN 0142-727X

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Abstract

This paper discusses experimental results from a number of different build configurations of the Sussex Multiple Cavity Rig. Measurements of the axial, tangential and radial velocity components are presented. These measurements were made using a two component, Laser Doppler Anemometry (LDA) system. The test rig is a 70 % of full scale version of a high pressure compressor stack from a gas turbine aero engine. Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of the flow in these with a central axial throughflow of cooling air. Tests were carried out for a range of non-dimensional parameters representative of H.P. compressor internal air system flows (ReO up to 4 x 106 and Rez up to 1.8 x 105). Two different builds have been tested and the difference between these is the size of the annular gap between the (non-rotating) drive shaft and the bores of the discs. There are significant differences between the radial distributions of tangential velocity in the two builds of the test rig. For a smaller annular gap between the drive shaft and the disc bore, there is an increase of non-dimensional tangential velocity VO / N)r with radial location to solid body rotation VO / N)r = 1. For the larger annular gap, there is a decrease with radial location to solid body rotation. An analysis of the frequency spectrum obtained from the tangential velocity measurements is consistent with a flow structure consisting of pairs of contra rotating vortices.

Item Type: Article
Additional Information: This paper describes LDA flow measurements from a rig that is a 70 % of full scale version of a high pressure compressor stack from a gas turbine aero engine. The flow is shown to be a function of the annular gap between the disc bore and shaft and spectral analysis is consistent with the flow comprising pairs of contra rotating vortices. This research was carried out for Rolls-Royce, MTU, Volvo and Alstom as part of the Internal Cooling Air Systems for Gas Turbines 2 (ICAS-GT2) research programme (2001-2005). Peter Childs was the lead academic for Sussex.
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Christopher Long
Date Deposited: 06 Feb 2012 21:00
Last Modified: 02 Apr 2012 14:55
URI: http://sro.sussex.ac.uk/id/eprint/29075
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