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UNSTEADY FLOW PHENOMENA IN TURBINE RIM SEALS

Beard, PF, Chew, J, Gao, F and Chana, KS (2016) UNSTEADY FLOW PHENOMENA IN TURBINE RIM SEALS ASME Journal of Engineering for Gas Turbines and Power, 139 (3), 032501.

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Abstract

While turbine rim sealing flows are an important aspect of turbomachinery design, affecting turbine aerodynamic performance and turbine disc temperatures, the present understanding and predictive capability for such flows is limited. The aim of the present study is to clarify the flow physics involved in rim sealing flows and to provide high quality experimental data for use in evaluation of CFD models. The seal considered is similar to a chute seal previously investigated by other workers, and the study focuses on the inherent unsteadiness of rim seal flows, rather than unsteadiness imposed by the rotating blades. Unsteady pressure measurements from radially and circumferentially distributed transducers are presented for flow in a rotor-stator disc cavity and the rim seal without imposed external flow. The test matrix covered ranges in rotational Reynolds number, Re∅, and non-dimensional flow rate, , of 2.2 –3.0x106 and 0 – 3.5x103 respectively. Distinct frequencies are identified in the cavity flow and detailed analysis of the pressure data associates these with large scale flow structures rotating about the axis. This confirms the occurrence of such structures as predicted in previously published CFD studies and provides new data for detailed assessment of CFD models.

Item Type: Article
Subjects : Mechanical Engineering Science
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
AuthorsEmailORCID
Beard, PFUNSPECIFIEDUNSPECIFIED
Chew, JUNSPECIFIEDUNSPECIFIED
Gao, FUNSPECIFIEDUNSPECIFIED
Chana, KSUNSPECIFIEDUNSPECIFIED
Date : 27 September 2016
Identification Number : 10.1115/1.4034452
Copyright Disclaimer : Copyright © 2016 by Rolls-Royce UK
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 12 Jul 2016 15:03
Last Modified : 19 Oct 2016 13:20
URI: http://epubs.surrey.ac.uk/id/eprint/811183

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