To provide a high conversion degree of enthalpy inherent in a stage by selecting the length and height of an axial blade chord so that the value represented by a specified expression is a specified value or more to a part of a turbine situated between the inflow part and outflow part of a housing, or the line of blades advanced substantially in the axial direction.
In a turbine having a reactivity of stage larger than 0.15, the length Sax and height (h) of axial blade chord are selected so that the characteristic number RSH represented by the expression (wherein P: the output W of the turbine, /p: the arithmetic average Pa between inflow and outflow pressures, z: the number of stages, m: the substance flow of a flowing operating medium kg/s, N: rotating speed l/s, hp: the height (m) of the blade of a line (i) of blades measured on the outflow side of blades, DM.i: the average value (m) of the outer diameter of a hub and the inside diameter of a housing on the outflow side of the blade of the line (i) of blades, Sax.i: the length (m) of the axial blade chord of the blade of the line (i) of blades measured in the length of the maximum blade chord) is 1 or more to lines LE, LA of guide and rotary blades axially arranged between the inflow and outflow parts 31, 32 of a housing 30.
HAVAKECHIAN SAID DR
ROEMER HARALD
SZINCSAK PETER
Next Patent: DAMPING STRUCTURE OF MOVING BLADE