Patent ID: 9623354
Date: 2017-04-18
CPC Classifications: B01D,F01D,F02C

Claim:
1. A system for extracting foreign matter in a gas turbine, the system comprising: a core engine flow path bounded by an inner engine casing and an outer engine casing forming an annular compressor discharge; a plurality of variable bleed valve (VBV) doors disposed on the outer engine casing of a fan hub frame between a low pressure compressor and a high pressure compressor configured to bleed a portion of flow from the core engine flow path into a bypass flow path to extract foreign particles, an outlet guide vane (OGV) assembly comprising a plurality of guide vanes that are circumferentially-spaced and disposed within the core engine flow path proximate to a downstream side of the low pressure compressor, and a plurality of circumferentially-spaced support struts positioned downstream from the plurality of guide vanes configured to support the fan hub frame, wherein each pair of adjacent support struts comprises at least one VBV door therebetween and a section of the OGV assembly located at an upstream side of the fan hub frame before the each pair of adjacent support struts, wherein the section of the OGV assembly comprises a first side with one or more first side guide vanes with trailing edges that are shorter compared to the remaining plurality of guide vanes of the section of the OGV assembly and configured for directing flow into the at least one VBV door without impacting the one or more first side guide vanes at the first side.