Fluid flow machine with sidewall boundary layer barrier

A fluid flow machine, comprising:

• a main flow path;
• a main flow path confinement confining the main flow path;
• at least one row of blades arranged in the main flow path, with at least one blade end of the blade row fixed to the main flow path confinement, and;
• at least one longish, obstacle-type boundary layer barrier (11) being provided in an area of the fixed blade end at a sidewall, which in at least part of its course, is oriented obliquely to a main flow direction, thereby deflecting fluid flowing near the sidewall towards a blade pressure side, wherein it is provided that:
• a.) a skeleton line is allocated to each blade profile section on a sidewall of the fixed blade end provided with the at least one boundary layer barrier, with the skeleton line being defined within the profile by a centerline between a pressure and a suction side and outside of the profile by a respective tangential continuation of this centerline on leading and trailing edges,
• b.) a family of auxiliary lines is given in an area between the skeleton lines of two adjacent sidewall profile sections along the sidewall, with each auxiliary line being generated by merely shifting the sidewall profile skeleton line in a circumferential direction u, and with a course of an auxiliary line at any point in the area of said fixed blade end characterising the course of the main flow,
• c.) the at least one boundary layer barrier has a starting point from which it extends with a direction component which is transverse relative to the auxiliary lines, so that the boundary layer barrier intersects the family of auxiliary lines in such a manner that, commencing at the starting point, a course of the boundary layer barrier continuously departs from a convex side of an auxiliary line and approaches a concave side of an adjacent auxiliary line, and
• d.) the course of each boundary layer barrier is defined by a top line, which is formed by a connecting line of points of maximum elevation of the boundary layer barrier.