High-Pressure Steam Flow in Turbine Bypass Valve System Part 1: Valve Flow

This paper presents a study of steam e ow behavior through a high-pressure turbine bypass valve when it suffers a high-pressure reduction in an electric-power-plant cogeneratorsystem. Efforts have been mainly directed at investigating the process of steam e ow and property variations in the aforementioned bypass valve as well as at obtaining correlations between the e ow rate and the valve opening ratio. Modeling of the high-pressure turbulent steam e ow was performed on a three-dimensional nonstaggered grid system by employing the e nite volume differencing method and by solving the three-dimensional, turbulent, compressible Navier ‐Stokes and energy equations. Through this research numerous data have been acquired and analyzed. These efforts enable us to obtain a correlation data set for the valve-opening vs the e ow rate coefe cient of the valve. One of the signie cant accomplishments isto use the model presented here to further improvethedesign of a high-pressuresteam turbine bypass e ow valve to reduce a high-velocity spot in the valve e ow pass so that noise can be suppressed.

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