TANGENTIAL ON-BOARD INJECTOR (TOBI) ASSEMBLY

A tangential on-board injector (TOBI) (30) having: a body (32) defining an annular passageway (38), discharge nozzles (33); a rotating component configured to be mounted for rotation relative to the body (32) about an axis of rotation (11); a seal (37;137) extending between the body (32) and the rotating component; and flow passages (52;152;252) circumferentially distributed about the axis of rotation and in fluid communication with the nozzles (33) and the seal (37;137), the flow passages (52;152;252) located upstream of the seal (37;137) relative to a flow of the cooling air circulating toward the seal (37;137) from the plurality of discharge nozzles (33), each of the flow passages (52;152;252) extending along a respective passage axis (H), the passage axis (H) of at least one of the flow passages (52;152;252) having a tangential component at an outlet (52O) of the at least one of the flow passages (52;152;252) that is different than a tangential component of an exit flow axis (A) of at least one of the plurality of discharge nozzles (33).