Yuki Kurosawa, Chongho Youn

Abstract: This study is performed to confirm the flow characteristics under varying inlet pressures in a control valve using a single-stage resistance perforated cage via experiments and computational fluid dynamics (CFD) simulation and to evaluate the flow state based on CFD visualization results. The target control valve is a 2-inch perforated cage valve, and the hole shape is cylindrical with a diameter of 2.5 mm. The flow coefficient (Cv) is calculated based on three differential pressures, and the liquid pressure recovery factor (FL) is calculated using the maximum differential pressure. We calculate and compare the Cv and FL, which are flow characteristics, from the experimental and CFD results to confirm the validity of the CFD analysis model. Subsequently, the pressure distribution, velocity distribution, void fraction, and erosion are visualized based on the CFD analysis results. The results show that a region with a high void fraction is generated owing to cavitation caused by flow separation at the inlet of the perforation, and that an increase in the inlet pressure results in a region with a high void fraction expanding to the outlet of the perforation.

Keywords: Control valve, Cavitation, CFD, Visualization.

Date Published: August 30, 2024
DOI: 10.11159/jffhmt.2024.027

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