Turbocharger

A turbocharger comprising:

• a housing including a first scroll flow path and a second scroll flow path formed so as to surround a predetermined axis;
• and
• a turbine wheel having front edges for receiving a working fluid from the first scroll flow path and the second scroll flow path, the turbine wheel being disposed in the housing so as to be surrounded by the first scroll flow path and the second scroll flow path with the axis as a rotational axis,
• wherein the turbine wheel has blades having the front edges and a hub including base ends of the blades,
• the housing includes a shroud covering the blades,
• each front edge includes a first portion for receiving the working fluid flowing out from the first scroll flow path, and a second portion disposed more toward the shroud than the first portion for receiving the working fluid flowing out from the second scroll flow path,
• the first portion being inclined with respect to a virtual plane including the axis in a direction opposite a rotational direction of the turbine wheel,
• the second portion being inclined with respect to the virtual plane in the rotational direction,
• where a length of each front edge from the hub to the shroud is 1, the first portion includes a first reference point set to a position on the front edge at a length ¼ from the hub, and the second portion includes a second reference point set to a position on the front edge at a length ¾ from the hub,
• a difference between a first blade angle of the front edge at the first reference point and a second blade angle of the front edge at the second reference point is 1 to 10 degrees,
• the turbine wheel has a turbine end face formed on a side opposite the shroud in the axis,
• an entirety of the first scroll flow path is disposed between a partition wall extending in an incline direction with respect to the turbine end face, and the turbine end face, and
• the entirety of the second scroll flow path is disposed between the partition wall and the axis.

A turbocharger comprising:

• a housing including a first scroll flow path and a second scroll flow path formed so as to surround a predetermined axis;
• and
• a turbine wheel having front edges for receiving a working fluid from the first scroll flow path and the second scroll flow path, the turbine wheel being disposed in the housing so as to be surrounded by the first scroll flow path and the second scroll flow path with the axis as a rotational axis,
• wherein the turbine wheel has blades having the front edges and a hub including base ends of the blades,
• the housing includes a shroud covering the blades,
• each front edge includes a first portion for receiving the working fluid flowing out from the first scroll flow path, and a second portion disposed more toward the shroud than the first portion for receiving the working fluid flowing out from the second scroll flow path,
• the first portion being inclined with respect to a virtual plane including the axis in a direction opposite a rotational direction of the turbine wheel,
• the second portion being inclined with respect to the virtual plane in the rotational direction,
• where a length of each front edge from the hub to the shroud is 1, the first portion includes a first reference point set to a position on the front edge at a length ¼ from the hub, and the second portion includes a second reference point set to a position on the front edge at a length ¾ from the hub,
• a difference between a first blade angle of the front edge at the first reference point and a second blade angle of the front edge at the second reference point is 1 to 10 degrees,
• the turbine wheel has a turbine end face formed on a side opposite the shroud in the axis, and
• an entirety of the first scroll flow path and an entirety of the second scroll flow path are disposed between the turbine end face and the axis, when the first scroll flow path and the second scroll flow path are viewed in a cross section including the axis.