Casing treatment system and method
AssigneePurdue Research Foundation
InventorsNicole Leanne Key, William Joseph Brown, Andrew Curtis Cusator, Yu Ning Dai
Life of this patent
Estimating the term…
Abstract
The casing treatment system includes a compressor having an injection port, an extraction portion, a recirculation channel. It is also contemplated for the casing treatment system to include a plurality of injection ports, a plurality of extraction ports, and/or a plurality of recirculation channels. The casing treatment system is based on using the differences in the flow field at peak efficiency and near stall to “turn on” the recirculation at near stall operation to extend the stall margin, and to “turn off” the recirculation at peak efficiency operation to minimize impact to efficiency.
Claims19
A method of designing a casing treatment system for a compressor, the method comprising the steps of:
- providing a compressor to be configured including a rotor having a leading edge, and a rotor shroud disposed at least partially over the rotor;
- using one or more processors to obtain rotor shroud static pressure distribution data for the compressor at an operating point near stall and an operating point at peak efficiency, wherein the pressure distribution data includes shroud static pressure as a function of circumferential position and axial position on the rotor shroud;
- determining, from the obtained pressure distribution data, a shroud pressure variation with axial location for at least one of the operating point near stall and the operating point at peak efficiency;
- selecting an injection port location on the rotor shroud based on the shroud pressure variation with axial location;
- selecting an extraction port location on the rotor shroud based on a driving pressure defined between the extraction port location and the selected injection port location;
- selecting a pitchwise clocking between the selected injection port location and the selected extraction port location, wherein the pitchwise clocking is defined as the circumferential offset of the injection port location relative to the extraction port location expressed as a fraction of a rotor blade pitch;
- and
- generating a design specification that specifies an injection port at the selected injection port location, an extraction port at the selected extraction port location, and a recirculation channel fluidly coupling the injection port to the extraction port in accordance with the selected pitchwise clocking.
Dependencies are inferred from the claim text.