Holset Engineering Company, Limited

Roy Saxton

Bahram Nikpour

Andrew Paul Day

Paul A Eynon

John Bywater

Steven Howarth

A compressor for compressing a gas comprises an impeller wheel () mounted within a housing () defining an inlet and an outlet (). The inlet comprises an outer tubular wall () extending away from the impeller wheel in an upstream direction and forming a gas intake portion () of the inlet, and an inner tubular wall () of diameter D extending away from the impeller wheel in an upstream direction within the outer tubular wall () and defining an inducer portion () of the inlet. An annular gas flow passage () is defined between the inner and outer tubular walls () and has an upstream end and a downstream end separated by a length Lmeasured along its axis. The upstream end of the annular passage () communicates with the intake or inducer portions of the inlet through at least one upstream aperture and at least one downstream aperture () communicates between a downstream portion of the annular flow passage () and the impeller. The inner tubular wall () has a length Lextending upstream from the downstream aperture(s) (). The length of the inner tubular wall () is such that L/D&#x3e;0.65 and/or L/D&#x3e;0.6.

Compressor

A compressor for compressing a gas comprises an impeller wheel () including a plurality of vanes () rotatably mounted within a housing (). The housing () has an inner wall defining a surface () located in close proximity to radially outer edges () of impeller vanes (). The compressor inlet comprises an outer tubular wall () extending forming a gas intake and an inner tubular wall () extending within the outer tubular wall () and defining an inducer portion () of the inlet. An annular gas flow passage () is defined between the inner and outer tubular walls. There is at least one downstream aperture () communicating between the annular flow passage () and the surface () of the housing () swept by the impeller vanes () and at least one upstream aperture communicating between the annular flow passage () and the inducer or intake portions of the inlet. A plurality of inlet guide vanes () are mounted within the inducer portion () of the inlet downstream of the at least one upstream aperture to induce pre-swirl in gas flowing through the inducer portion of the inlet.

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Meltham Holmfirth, United Kingdom

Roy Saxton