Annular flow duct for a turbomachine through which a main flow can flow in the axial direction

US8066471B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Romain Bayere · Berlin, DE
• Malte Blomeyer · Wetter (Ruhr), DE
• Christian Cornelius · Winsen (Aller), DE
• Torsten Matthias · Flonheim, DE
• Uwe Sieber · Mülheim an der Ruhr, DE

Key dates

• Filing date: May 29, 2007
• Grant date: Nov 29, 2011
• Expiry date: Nov 19, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Disclosed is an annular flow duct for a turbomachine, the flow duct arranged concentrically about a machine axis running in the axial direction and defined by a boundary wall of circular cross section for directing a main flow, wherein the boundary wall has a plurality of return flow passages distributed over its circumference and through which in each case a partial flow is detached from the main flow at a bleed position and returned to the main flow at a feed position situated upstream of the bleed position, and having aerofoils, arranged radically in the flow duct, of a blade ring, the aerofoil tips of which lie opposite the boundary wall, with a gap formed in each case, wherein the aerofoils are movable in a predetermined rotation direction along the circumference of the boundary wall. Furthermore, a compressor which is insensitive to pumping and flow separations, as viewed in rotation direction, the bleed position of each return flow passage lies upstream of the corresponding feed position.