Computation of the Flow in a H P Compressor Drive Cone Cavity

Tham, Kok M, Long, Christopher A, Turner, Alan B, Childs, Peter and Dixon, JA (2003) Computation of the Flow in a H P Compressor Drive Cone Cavity. In: IGTC Conference, Tokyo.

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Abstract

In some modern aero-engines, the H.P. drive cone cavity is used to deliver cooling air bled from the last stage of the H.P. compressor to the turbine blades, or simply to ventilate the cavity to prevent excessive heating. Engine designers are concerned about the temperature rise of the cooling air due to viscous dissipation and heat transfer. Using an engine-representative geometry, and matching non-dimensional parameters typical of modern turbofans, laser Doppler anemometry easurements were complemented by steady, axisymmetric, CFD computations using the commercial code FLUENT. The experimental results reinforce previous findings in the upstream cavity, and new velocity measurements in the downstream cavity are also presented. In general, CFD tends to underpredict the core swirl ratio in the drive cone cavity, with agreement improving with decreasing | ¿turb |, but the Rankine vortex profile was well predicted. For thedownstream cavity, measurements and computations show a radial distribution of tangential velocity of a Rankine ortex, with a stronger free vortex component than the upstream cavity. CFD flow patterns and velocity distributions suggest a departure from a rotationally- to a throughflow-dominated flow regime as throughflow rates are increased; a demarcation parameter of | ¿turb | = 0.1 is suggested.

Item Type: Conference or Workshop Item (Paper)
Additional Information: This experiment makes a comparison between theory and experimental results. The experimental data are taken from a complex test rig involving a rotating engine drive cone enclosed in a pressure casing. The simple theory is developed to predict the distribution of pressure along the stationary wall of the casing. There is good agreement between theory and experiment and a parameter is suggested which will determine if the flow is dominated by rotational forces or axial inertia. This work is of importance to both the designers of gas turbine cooling systems as well as being useful from a fundamental aspect of the behaviour of a particular class of rotating flow. Dr. C. A. Long was the supervisor to Dr. K. M. Tham who obtained his D.Phil working on this project. Dr. K. M. Tham wrote the paper.
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Christopher Long
Date Deposited: 06 Feb 2012 20:31
Last Modified: 04 Apr 2012 09:50
URI: http://sro.sussex.ac.uk/id/eprint/26364
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