Exhaust hood and its flow guide for steam turbine

An exhaust hood for a steam turbine,

• the steam turbine comprising:
• a turbine rotor;
• and
• a plurality of moving blades disposed on an outer periphery side of the turbine rotor;
• the exhaust hood comprising:
• a bearing cone disposable on an inner periphery side and on a downstream side of the moving blades of a final stage of the steam turbine;
• an annular flow guide, having a center axis, disposable on an outer periphery side and on the downstream side of the moving blades of the final stage of the steam turbine;
• and
• an external casing surrounding the bearing cone and the flow guide,
• wherein meridional shapes of the flow guide at respective circumferential positions are shapes obtained by rotating one certain representative shape around an upstream end of the one certain representative shape in a meridional plane and by reducing or maintaining a radial length of the one certain representative shape, and
• wherein a circumferential distribution of inclination angles of an upstream end of the flow guide with respect to the center axis has representative inclination angles at respective representative positions in a circumferential direction, the circumferential distribution of the inclination angles between the representative positions being defined by a linear interpolation using the representative inclination angles at the representative positions, each of the representative positions being a position where the inclination angles change from increasing to decreasing, from decreasing to increasing, or from constant to increasing.