Abstract
The orifice plate is used to reduce the noise produced by the high velocity steam flow in the high pressure reducing valve. The main objective is to study the relationship between the orifice plate structure and the aerodynamic noise. Computational fluid dynamics (CFD) approach is used to simulate the flow and the acoustic field in the valve. The numerical results are validated with a simplified theoretical model. It is shown that the plate thickness and the cavity length have an influence on the shape of the spectrum periodic curve. The orifice plate with larger area ratio or multiple holes structure has a better noise reduction performance. But their effects are not great as the plate thickness and the cavity length. The main reason is the compressibility of the high pressure steam and further study is needed to prove it.
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