Dual-entry centrifugal compressor
AssigneeA/S Kongsberg Vapenfabrikk
InventorRolf J. Mowill
Life of this patent
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Abstract
The improved dual-entry radial compressor rotor of the present invention has two sets of alternating full length and partial length blades on a symmetrical hub, with the partial length blades on one hub side terminating at the rotor high velocity exit coincident with the full length blades on the other hub side, to smooth the gas velocity profile in the tangential direction. Aerodynamically shaped sawtooth-profiled reliefs are provided in the hub radial portion between the blade tips to allow induced pressure differentials between the flow paths to smooth the axial velocity profile.
Claims10
An improved high performance centrifugal compressor of the type having a rotor with a pair of opposing axially directed low velocity inlets and a common, radially directed high velocity outlet, the compressor rotor having an integral, axisymmetric hub with a central, full radius portion and two tapering flanking portions, the hub defining, in part, twin flow paths through the compressor, the improvement comprising:
- two sets of full length compressor blades mounted on the hub, the individual blades of each full length blade set extending along substantially the entire length of a respective one of the twin flow paths between the respective inlet and the outlet;
- at least two sets of partial length compressor blades mounted on the hub, the individual blades of each partial length blade set extending along only the portion of a respective one of the twin flow paths proximate the high pressure radial outlet, the individual blades of the full length blade set and the partial length blade set in each flow path being positioned in alternating relation about the rotor circumference;
- and
- means for reducing variations in the velocity profile of the high velocity gas exiting the radial outlet, said means including a positioning about the rotor circumference of the individual blades of the full length blade set in one flow path to terminate at the high velocity radial outlet coincident with the individual blades of the partial length blade set in the other flow path.
An improved high performance centrifugal compressor of the type having a rotor with a pair of opposing axially directed low velocity inlets and a common, radially directed high velocity outlet, the compressor rotor having an integral, axisymmetric hub with a central, full radius portion and two tapering flanking portions, the hub defining, in part, twin flow paths through the compressor, the improvement comprising:
- two sets of full length compressor blades mounted on the hub, the individual blades of each full length blade set extending along substantially the entire length of a respective one of the twin flow paths between the respective inlet and the outlet;
- at least two sets of partial length compressor blades mounted on the hub, the individual blades of each partial length blade set extending along only the portion of a respective one of the twin flow paths proximate the high velocity radial outlet, the individual blades of the full length blade set and the partial length blade set in each flow path being positioned in alternating relation about the rotor circumference;
- and
- means for reducing variations in the velocity profile of the high velocity gas exiting the radial outlet, said means including a positioning about the rotor circumference of the individual blades of the full length blade set in one flow path to terminate at the high velocity radial outlet coincident with the individual blades of the partial length blade set in the other flow path,
- said velocity variation reducing means further including reliefs formed in portions of the hub separating the twin flow paths at the high velocity radial outlet for promoting initial mixing of the separate gas streams upstream of the outlet.
An improved high performance centrifugal compressor of the type having a rotor with a pair of opposing axially directed low velocity inlets and a common, radially directed high velocity outlet, the compressor rotor having an integral, axisymmetric hub with a centrally located full radius portion and two tapering flanking portions, the hub defining, in part, twin flow paths through the compressor, the improvement comprising:
- two sets of full length compressor blades mounted on the hub, the individual blades of each full length blade set extending along substantially the entire length of a respective one of the twin flow paths between the respective inlet and the outlet;
- at least two sets of partial length compressor blades mounted on the hub, the individual blades of each partial length blade set extending along only the portion of a respective one of the twin flow paths proximate the high velocity radial outlet, the individual blades of the full length blade set and the partial length blade set in each flow path being positioned in alternating relation about the rotor circumference;
- and
- means for reducing variations in the velocity profile of the high velocity gas exiting the radial outlet, said means including a positioning about the rotor circumference of the individual blades of the full length blade set in one flow path to terminate at the high velocity radial outlet coincident with the individual blades of the partial length blade set in the other flow path;
- and
- the compressor further including pipe diffuser means operatively connected to receive the high velocity gas exiting the compressor rotor outlet.
Dependencies are inferred from the claim text.