Steam Enthalpy Calculation Model for Wet Steam Region of Steam Turbines

To accurately determine the extraction and exhaust enthalpy in wet steam region of steam turbines, a new calculation model is proposed based on the concept of stage indicative relative internal efficiency and the method of both energy balance and curve extrapolation, with which calculations were performed for steam turbine under various conditions. Results show that this model demands little on initial iterative values by energy balance method, and has a good adaptability under various conditions, of which the calculation precision for both the regenerative extraction enthalpy in wet steam region and the exhaust enthalpy of low-pressure casing is higher than that of other existing models.