Rotor arrangement for over tip leakage measurement using a multi-hole pressure probe
AssigneeROLLS-ROYCE plc
InventorsJames Peter Roberts, David Fillingham
Life of this patent
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Abstract
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.
Claims19
A rotor arrangement comprising:
- a rotor stage having an annular array of rotor blades, each blade having a tip;
- a casing surrounding the rotor stage and defining a clearance between the tips of the rotor blades and the casing;
- and
- an over tip leakage measurement system including a multi-hole pressure probe mounted to a stationary component axially spaced from the rotor stage, the probe arranged to substantially align an axis of symmetry of the probe with an expected flow direction from the rotor stage, the probe including a plurality of holes that are symmetrical about the axis of symmetry of the probe.
A method of measuring over tip leakage between rotor blade tips and a surrounding casing of a rotor stage, the method comprising steps to:
- provide a multi-hole pressure probe axially spaced from the rotor stage and arranged to substantially align an axis of symmetry of the probe with an expected flow direction from the rotor stage, the probe including a plurality of holes that are symmetrical about the axis of symmetry of the probe;
- measure a pressure at each hole of the plurality of holes of the probe;
- compare the measured pressures to expected pressures and output a pressure difference for each hole;
- and
- derive a flow direction of fluid exiting the rotor stage from the pressure differences, the flow direction being determined relative to an axial direction.
Dependencies are inferred from the claim text.