Rolls-royce Corporation

James Peter Roberts

Harold Heyworth

Colin J Parrish

David Fillingham

Leighton Tipton

Colin James Parrish

Leighton Philip Tipton

A rotor arrangement including: a rotor stage having an annular array of rotor blades each blade having a tip; a casing that surrounds the rotor stage and defines a clearance between the tips and the casing; and an over tip leakage measurement system including a multi-hole total pressure probe mounted to a stationary component downstream of the rotor stage; the probe arranged such that the axis of at least one of the holes is substantially aligned with an expected flow direction from the rotor stage.

Rotor arrangement for over tip leakage measurement using a multi-hole pressure probe

Apparatus is provided for determining the clearance between a member and a casing surface over and relative to which the member moves, e.g. in a gas turbine engine. The apparatus includes a main waveguide and a reference element that is provided at a position intermediate the proximal and distal ends, or at the distal end, of the waveguide. The transmitter/receiver is arranged to transmit an electromagnetic signal through the main waveguide and receive (i) a first portion of the electromagnetic signal reflected from the reference element, (ii) a second portion of the electromagnetic signal reflected from the casing surface, and (iii) a third portion of the electromagnetic signal reflected from the member, allowing the relative positioning of the reference element, the casing surface and the member to be simultaneously determined.

Clearance and wear determination apparatus

A rotating shaft has a torsional oscillation frequency that is dependent on the stiffness of the shaft. The torsional oscillation frequency and the stiffness are dependent upon the operating conditions of the shaft. The torque of the rotating shaft is determined by measuring the torsional oscillation frequency of the rotating shaft; measuring the twist induced in the rotating shaft by the torque; and using the measured value of the torsional oscillation frequency and the measured value of the induced twist to determine the torque induced in the shaft.

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Derby, United Kingdom

James Peter Roberts