Gas turbine diffuser strut including coanda flow injection

摘要

An exhaust diffuser comprising an inner boundary and an outer boundary forming an annular gas path, and a plurality of strut structures extending radially within the gas path. Each of the strut structures include pressure and suction side walls, and a plurality of radially spaced flow injectors are formed in at least one of the pressure and suction side walls for injecting a fluid flow into the gas path adjacent to the strut structure. At least two fluid supply conduits provide a fluid flow to respective radially spaced flow injectors, and a flow control device is associated with each of the conduits to independently control a fluid flow from a fluid source to each of the radially spaced flow injectors.

主权项

1. An exhaust diffuser for a gas turbine engine, comprising:
an inner boundary and an outer boundary forming an annular gas path; a plurality of strut structures extending radially between the inner boundary and the outer boundary and located within the gas path downstream of a last row of rotating blades of the gas turbine engine; each of the strut structures including pressure and suction side walls extending in a downstream axial direction from a leading edge toward a downstream trailing edge of the strut structure; a plurality of radially spaced flow injectors formed in at least one of the pressure and suction side walls, the flow injectors injecting a respective fluid flow into the gas path adjacent to the strut structure, the flow injectors being oriented so as to direct the respective fluid flow substantially parallel to an outer surface of the at least one of the pressure and suction side walls in a direction along an exhaust flow, producing a Coanda jet flow adjacent to the at least one of the pressure and suction side walls, to entrain and accelerate a portion of the exhaust flow to result in substantially attached flow along the at least one of the pressure and suction side walls; and at least two fluid supply conduits connected to provide a fluid flow to respective radially spaced flow injectors, and a flow control device associated with each of the conduits to independently control a fluid flow from a fluid source to each the radially spaced flow injectors, the radially spaced flow injectors being associated with respective plenums within the strut structure which are separated from each other.