SYSTEM FOR EXTRACTING MATTER THROUGH VARIABLE BLEED VALVES IN TURBINES

摘要

A system for extracting foreign matter in a gas turbine includes multiple variable bleed valve (VBV) doors disposed on the outer engine casing between a low pressure compressor and a high pressure compressor for bleeding a portion of flow from a core engine flow path into a bypass flow path. The system includes an outlet guide vane (OGV) assembly having multiple guide vanes disposed within the core flow path and multiple support struts positioned downstream from the multiple guide vanes. Each pairs 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 pairs of adjacent support struts. Each section of the OGV assembly includes a first side with one or more guide vanes with trimmed trailing edges configured for directing flow into the at least one VBV door.

主权项

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 pairs 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 pairs of adjacent support struts,wherein the section of the OGV assembly comprises a first side with one or more first side guide vanes with short trailing edges 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.