Investigation of rim seal exchange and coolant re-ingestion in rotor stator cavities using gas concentration techniques

Eastwood, Daniel (2014) Investigation of rim seal exchange and coolant re-ingestion in rotor stator cavities using gas concentration techniques. Doctoral thesis (PhD), University of Sussex.

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Gas turbine engine performance requires effective and reliable internal cooling over the
duty cycle of the engine. Understanding the effectiveness of cooling flows when making
life predictions for rotating components subject to the main gas path temperatures is
crucial. A test facility has been developed at the University of Sussex incorporating a
two stage turbine designed to support a European funded research project with the
objective of enhancing the understanding of interactions between main annulus gas
paths and secondary air systems. This thesis describes the specific contribution of the
author to the research conducted at the test facility.

Non-invasive gas seeding and concentration measurement techniques together with hot
geometry displacement measurements have been developed to meet three distinct
objectives: to determine inter-stage seal flows between rotor disc cavities; to provide
data to quantify rim seal exchange flows between rotor stator cavities and the main
annulus gas path for both bulk ingestion and egress conditions; and, to provide data to
quantify the re-ingestion of cooling air egressed into the main annulus gas path.
Detailed knowledge of these flows is vital to understanding the flow structures within
rotor stator cavities and to optimise coolant delivery methods.

Experimental results are presented for a number of cooling flow supply geometries and
flow rates. The gas concentration measurement techniques developed and the results
obtained are compared to traditional measurements as well as numerical simulations
carried out by research project partners. This work develops the measurement
techniques of rotor stator cavity flows and provides data suitable for the validation of
improved thermo-mechanical and CFD codes, beneficial to the engine design process.

Item Type: Thesis (Doctoral)
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ0266 Turbines. Turbomachines (General)
Depositing User: Library Cataloguing
Date Deposited: 10 Jun 2014 08:36
Last Modified: 21 Sep 2015 13:57

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