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The computational method for compressible flows with condensation was developed. Condensation was formulated by two thermodynamic equations of state for pressure and energy. These equations of state were simultaneously solved with the Euler equation and heat transfer equations. A finite volume method based on an approximate Riemann solver was adopted to solve the Euler equation. The computational method was applied to compressible flows in the condenser and the turbine exhaust hood. The flow regime changed widely from subsonic flow to transonic one during a small decrease of cooling water temperature. Subcooling temperature from the annulus of the turbine blades to the condensate in the hot well was investigated. Results showed the subcooling temperature could be reduced by using an advanced steam guide which was designed to improve diffuser performance under widely changed conditions. Further improvement of the steam turbine system will be pursued by the presented method.

A Computational Method for Compressible Flows with Condensation in Power Plant Condensers