This study investigates the effects of asymmetric circular orifice patterns on pressure fluctuations in a pilot valve through computational fluid dynamics (CFD) analysis. Models with 2 to 5 circular orifices were developed, maintaining equal angular spacing around the pipe axis. The analysis was conducted using ANSYS CFX, and results such as outlet pressure, pressure hunting, velocity distribution, and turbulence kinetic energy were examined. The study found that increasing the number of orifices leads to a slight increase in outlet pressure, a decrease in the magnitude of pressure hunting, and a reduction in turbulence kinetic energy. Volume rendering and streamline visualization revealed that flow became more stable and linear as the number of orifices increased. These results suggest that increasing orifice count can contribute to mitigating pressure hunting and stabilizing flow characteristics in pilot valves.

Abstract
1. 서 론
2. CFD analysis
    2.1 해석 모델
    2.2 Mesh
    2.3 Results and Discussion
3. 결 론
References

• 곽효서(Assistant professor, Mechanical Engineering Major, Dong-Eui University) | Hyo-seo Kwak Corresponding author