Patent ID: 8834116
Filing Date: 2014-09-16
Classification: F04D

Abstract:
1. A fluid flow machine, comprising: a main flow path; at least one row of blades positioned in the main flow path in a portion of the fluid flow machine imparting energy to a working medium; at least one blade end of the blade row being firmly fixed to the main flow path confinement; at least one fluid-supplied peripheral chamber being arranged in an area of the fixed blade end outside of the main flow path confinement; at least one outlet being arranged in the main flow path confinement in the area of the fixed blade end adjacent and separated from at least one blade suction side through which fluid can be issued from the at least one peripheral chamber onto a surface of the main flow path confinement into the main flow path, wherein: a) the fluid jet, produced by virtue of a shape and orientation of the at least one outlet is oriented, immediately upon its entry into the main flow path, essentially tangentially to a contour of the main flow path confinement when viewed in a meridional plane (x-r plane) and essentially parallel to a local tangent to a skeleton line of a nearest profile of a blade and essentially in the direction of the main flow on the blade end, when viewed in a plane established by a circumferential direction u and a meridional direction m, b) an opening of the at least one outlet is provided on the main flow path confinement in the plane established by the circumferential direction u and the meridional direction m upstream of a trailing edge line between a convex side of the skeleton line of the nearest profile of a blade and a limiting line, with the skeleton line being formed by a centerline of a profile of the blade and tangential extensions at leading and trailing edges, the opening positioned between the at least one blade suction side and the limiting line passing through a passage formed between two blade profiles, the limiting line positioned at a constant distance (a) to a convex side of the skeleton line, where (a) is no greater than W+0.5d, with W being a width of the blade passage at the throat and d being a thickness of the profile of the blade at this throat, c) wherein, when the opening of the at least one outlet is a single outlet opening on a line normal to a skeleton line of the blade is provided on the main flow path confinement on the suction side of the blade, an extension and course of the single outlet opening has an outlet trajectory, with the outlet trajectory being formed by a transversing centerline of the outlet opening, d) wherein, when the opening of the at least one outlet is a row of side by side outlet openings extending along the line normal to the skeleton line of the blade is provided on the main flow path confinement on the suction side of the blade, an extension and course of the row of side by side outlet openings has an outlet trajectory, with the outlet trajectory being formed by a connecting line through centers of the row of side by side outlet openings, e) at least one outlet trajectory has, throughout its course, values of a relative inclination angle α in a range 0°<α<100°, with the relative inclination angle α being measured between a local tangent to the outlet trajectory in a point T and a local tangent to the skeleton line in a root point of a perpendicular from T on the skeleton line; wherein the opening of the at least one outlet is provided on the main flow path confinement in the plane established by the circumferential direction u and the meridional direction m upstream of a throat of the passage formed between two adjacent profiles of blades; and wherein the opening of the at least one outlet has at least one dimension that is greater than a thickness of a leading edge of the blade, wherein the at least one dimension is a cross-sectional dimension of the single outlet opening when the opening of the at least one outlet is the single outlet opening and the at least one dimension is a sum of like cross-sectional dimensions of the row of side by side outlet openings when the opening of the at least one outlet is the row of side by side outlet openings.