Separators for use with gas turbine engines

A gas turbine engine comprising:

• a shaft configured to rotate during operation of the gas turbine engine, the shaft disposed within a cavity containing a first fluid and a second fluid, the second fluid having a different density than the first fluid, wherein the first fluid is oil and the second fluid is air;
• and
• a separator coupled to the shaft, the separator including:
• a first ring including a first opening, the first opening receiving the first fluid and the second fluid from the cavity;
• a second ring surrounding the first ring;
• and
• a filter disposed between the first ring and the second ring, a rotation of the separator causing the first fluid and the second fluid to flow through a fluid pathway including the filter, the fluid pathway separating the first fluid from the second fluid.

A gas turbine engine comprising:

• a shaft configured to rotate during operation of the gas turbine engine, the shaft disposed within a cavity containing a first fluid and a second fluid, the second fluid having a different density than the first fluid, wherein the shaft is associated with a supercritical carbon dioxide pump, the first fluid is liquid supercritical carbon dioxide, and the second fluid is gaseous supercritical carbon dioxide;
• and
• a separator coupled to the shaft, the separator including:
• a first ring including a first opening, the first opening receiving the first fluid and the second fluid from the cavity;
• a second ring surrounding the first ring;
• and
• a filter disposed between the first ring and the second ring, a rotation of the separator causing the first fluid and the second fluid to flow through a fluid pathway including the filter, the fluid pathway separating the first fluid from the second fluid.