MID-TURBINE FRAME SPOKE COOLING SYSTEM AND METHOD

摘要

A mid-turbine frame module comprises an outer structural ring, an inner structural ring and a plurality of circumferentially spaced-apart spokes structurally interconnecting the inner structural ring to the outer structural ring. At least one of the tubular spokes accommodates a service line. The remaining spokes with no service line have an internal architecture which mimics an air cooling scheme of the at least one spoke housing a service line in order to provide temperature uniformity across all spokes.

主权项

1. A mid-turbine frame for a gas turbine engine, the mid-turbine frame comprising: an outer structural ring, an inner structural ring, an annular gas path between the inner and outer structural ring, a plurality of circumferentially spaced-apart hollow struts extending radially across the gas path, a plurality of circumferentially spaced-apart tubular spokes respectively extending internally through the hollow struts, the tubular spokes structurally connected to the inner structural ring and to the outer structural ring, at least one of the tubular spokes housing a service line, a remainder of the tubular spokes having a sleeve extending therethrough, an internal coolant flow passage defined centrally through the sleeve and an annular coolant flow passage defined between the sleeve and the tubular spoke, the internal coolant flow passage and the annular coolant flow passage connected in serial flow communication at respective adjacent ends thereof and with a source of coolant liquid to provide a coolant reverse flow path from a radially inward direction to a radially outward direction.