The Design and Development of a Low Emissions Transply Combustor for the Civil Spey Engine,
ROLLS-ROYCE LTD DERBY (ENGLAND)
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This paper describes the design and development of a low emissions tubo-annular combustor now entering service in the Spey aero gas turbine engine. The combustors, ten of which form the tubo-annular combustion system, are constructed from an advanced cooling material known as Transply. Use of this pseudo transpiration cooling material enables a significant saving to be made in using the wall cooling air. This air is used in optimising the primary zone and intermediate zone stoichiometry which, combined with an aerodynamic curved vane swirler, results in substantial reduction of emission levels. A number of significant durability problems have been overcome to meet the rigorous demands of aero-engine operation. The paper outlines the development process, starting with the constraints imposed by an existing engine design and describing the rig and engine test programme leading to a full definition of the aero-thermodynamics of the developed combustor.