Rolls-royce Corporation

James Melville

Jeffrey D Willis

Paul Fletcher

Phillip P Walsh

A combustion chamber assembly (,) comprises a primary, a secondary and a tertiary fuel and air mixing ducts (,) to supply fuel and air to primary, secondary and tertiary combustion zones (,). Each of the primary, secondary and tertiary fuel and air mixing ducts (,) comprises a pair of axial flow swirlers (,) arranged coaxially to swirl the air in opposite directions and fuel injectors (,) to supply fuel coaxially of the respective axial flow swirlers (,). Valves (,) are provided to control the supply of air to the primary and the secondary fuel and air mixing ducts (,) respectively. A duct (,) is arranged to supply cooling air and dilution air to the combustion chamber (,). The amount of air supplied to the primary, secondary and tertiary fuel and air mixing ducts (,) and the duct (,) is measured.

Combustion chamber with separate, valved air mixing passages for separate combustion zones

A gas turbine engine comprises a centrifugal compressor (,), an air diffuser (,), a heat exchanger (,), combustion apparatus (,), and first and second turbines (,). The combustion chamber assembly (,) comprises a primary, a secondary and a tertiary fuel and air mixing ducts (,). The compressor (,), diffuser (,), primary and secondary fuel and air mixing ducts (,) and turbines (,) all comprise means (,) for varying the mass flow area at their inlets such that in operation the amount of air mass through each component may be independently variable. Under part power conditions the mass flow is reduced and under full power conditions the mass flow is increased thereby maintaining a substantially constant gas cycle throughout the engine.

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Littleover, United Kingdom

James Melville