Patent ID: 8920126
Filing Date: 2014-12-30
Classification: F01D,F05D

Abstract:
1. A turbine comprising: rotor blades that rotate about a rotational axis in a main flow channel of an approximately-cylindrical-shaped casing whose diameter is increased toward a downstream side; stator vanes that are disposed in the casing at a distance from the rotor blades in the direction of the rotational axis; a tip shroud that is disposed at a radially-outward end of each of the rotor blades to constitute part of an annular-shaped shroud and whose length in a direction along the rotational axis is reduced as the distance from the rotor blade increases; and a cavity portion that is formed in a concave shape at a position in the casing facing the rotor blades and in which the tip shroud is accommodated, wherein an inclination angle θb of an inner periphery of the tip shroud with respect to the rotational axis is larger than an average inclination angle θa that is an inclination angle of an inner periphery of the casing with respect to the rotational axis, averaged from a trailing edge of the stator vanes disposed at an upstream side of a main flow to the cavity portion disposed at a downstream side of the main flow.