Patent ID: 8425182

Claim:
A radial turbine equipped with a turbine wheel having a main path that gradually increases in blade height while curving from a radial direction to an axial direction, the turbine wheel converting swirling energy of fluid that flows therein while swirling from a main inlet located at the outer circumferential side into the main path, with a radial flow as a main component, to a rotational motive force and axially discharging the fluid that has released the swirling energy, wherein the turbine wheel has a sub-path branching off and extending from the hub surface of the main path, the sub-path being located at a position radially inward of the main inlet and rearward of the main path; the sub-path has a sub-inlet that is located at a position in the radial direction different from the main inlet and at an outer circumferential end of the sub-path, and that is supplied with a fluid having a pressure different from the pressure of the fluid supplied through the main inlet; and the main inlet and the sub-inlet are partitioned by a gap adjusted between a back plate and a casing of the turbine wheel that constitute the main path.