Rolls-royce Corporation

Hang Wai Lung

Martin N Goodhand

Robert John Miller

Nicholas Barrington Orchard

Mitchel Cameron

Michael J S Gooder

Terence E Martin

Michael Arthur Howard

Michael John Sheldon Gooder

Martin Neil Goodhand

An aerofoil having a leading edge point within a leading edge region and a pressure surface with a profile wherein within the leading edge region the pressure surface profile has a local minimum. The local minimum reduces the loss which may be caused by high negative incidence on to the blade.

Aerofoils

A method for measuring the profile of a component in the region of an edge of the component comprises the following steps: determining the position of an edge point of the component; defining a center line for the component in the region of the edge; and measuring at least one dimension of the component with reference to the center line.

Method and system for measuring a component

Aerofoil members such as the stator vanes and rotor blades of an axial flow compressor are defined by a number of nominal sections. The leading edge of each nominal section of the blade is set so that an airflow passing therethrough is incident at the optimum angle. The optimum angle is chosen so that the maximum velocities of the airflow at the leading edge are equal. Once the optimum angle has been found for each section of the blade the sections are stacked to define a blade having a leading edge the aerodynamic profile of which ensures that the airflow is incident at the optimum angle along the length of the blade from the root to the tip. The efficiency of the axial flow compressor is improved.

Aerofoil members for gas turbine engines

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Derby, United Kingdom

Hang Wai Lung