Lubrication scavenge system for a turbine engine with counter-rotating shafts

A gas turbine comprising:

• a high pressure shaft having a terminal portion;
• a low pressure shaft, having an exposed portion extending axially beyond the terminal portion, the low pressure shaft concentric with the high pressure shaft;
• an interface region proximate the terminal and exposed portions,
• a sump housing radially surrounding the high pressure shaft and the low pressure shaft proximate the interface region, the sump housing comprising:
• a radially inner surface;
• a first pedestal mount for the terminal portion of the high pressure shaft and a second pedestal mount for the exposed portion of the low pressure shaft, each pedestal mount comprising an annular mount ring and plurality of stand-off pedestals, each pedestal mount extending radially inward from the radially inner surface of the sump housing,
• an orifice located in the interface region and axially between first pedestal mount and second pedestal mount,
• a first axial channel formed through first pedestal mount and a second axial channel formed through the second pedestal mount, wherein both the first axial channel and the second axial channel lead to the orifice, and a pair of turning passages formed in the sump housing that extend circumferentially around the sump and turn axially towards the orifice, wherein the turning passages are formed in part by at least a portion of the first axial channel and the second axial channel respectively, wherein the radial distance from the axis increases in each of the pair of turning passages as a function of axial proximity to the orifice.