The Equivalent Analysis on Two Defining Method of Relative Internal Efficiency for Steam Turbine in Physics Meaning

Firstly, two defining methods of relative internal efficiency for steam turbine are analyzed from energy equilibrium. Secondly, through calculating and analyzing the effects of the regenerating extraction, the sealing leakage and the operating condition of flow path in steam turbine on relative internal efficiency, that the effect value of two sort of relative internal efficiency may omit in a large changing range was point out. Furthermore, both of relative internal efficiency from different defining method can embody the operating condition of flow path in steam turbine, so they are equivalent in physics meaning. Finally, the relative internal efficiency with easily measured method should be adopted in monitoring relative internal efficiency or thermal test of steam turbine. And the detailed calculating method is given in this paper.