Abstract
The flow field in a steam control valve is investigated by using the 2-D experiment and CFD to clarify the causes of serious pressure fluctuations. The experiments are carried out by changing the pressure ratio and valve opening ratio. Five types of flow patterns are observed in the experiment. Two types of them are stable and one of them is asymmetric attached flow and other is symmetric free jet flow. Three types are unsteady with symmetric, asymmetric oscillations and their mixture. These types of flows could be simulated by a 2-CFD fairly well. From these results, the characteristics of each flow fields are clarified.
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