Intermediate housing of a gas turbine having an outer bounding wall having a contour that changes in the circumferential direction upstream of a supporting rib to reduce secondary flow losses

摘要

Intermediate housing (14), in particular of turbines (11, 13) of a gas turbine engine, having a radially inner bounding wall (23) and having a radially outer bounding wall (24, 24′), having a crossflow channel (33), which is formed by the bounding walls (23, 24, 24′) and within which at least one supporting rib (15) is positioned that has a leading edge (16), a trailing edge (17), as well as side walls (18) extending between the leading edge (16) and the trailing edge (17) that direct a gas flow traversing the crossflow channel (33); the radially outer bounding wall (24) having a contour that changes in the circumferential direction at least in one section upstream of the supporting rib (15).

主权项

1. A housing comprising:
a radially inner bounding wall; a radially outer bounding wall; a plurality of supporting ribs within a crossflow channel defined by the radially inner and outer bounding walls, the supporting ribs having a leading edge, a trailing edge, and side walls extending between the leading edge and the trailing edge, the side walls directing gas flow traversing the crossflow channel; the radially outer bounding wall having a contour changing in a circumferential direction at least in one section upstream of the supporting ribs; the housing being an intermediate housing of two turbines of a gas engine; wherein an axial position of the bounding wall section or of a bounding wall point of minimal radius of curvature changes in the circumferential direction in such a way that the bounding wall point is positioned maximally upstream at a circumferential position of the leading edge of the supporting ribs, and maximally downstream at a circumferential position of one half pitch between two adjacent supporting ribs of the plurality of supporting ribs; or wherein a radial position of the bounding wall section or of the bounding wall point of minimal radius of curvature changes in the circumferential direction in such a way that the bounding wall point is positioned maximally radially outwardly at a circumferential position of the leading edge of the supporting ribs, and maximally radially inwardly at a circumferential position of one half pitch between two adjacent supporting ribs of the plurality of supporting ribs.