Earticle

초록

영어

This study investigates the effect of orifice-pipe misalignment on flow characteristics and pressure hunting in a pilot valve using transient CFD analysis. Four models were created with a circular orifice (1 mm radius, 1 mm length) placed at offsets of 0.25 mm, 0.5 mm, 0.75 mm, and 1 mm from the pipe centerline (pipe diameter: 4 mm). Simulations were performed in ANSYS CFX with a 6.8 m/s inlet velocity and 3.2 bar outlet static pressure. A High Resolution advection scheme and Second-order Backward Euler time integration were used. Results showed that greater eccentricity led to more severe pressure hunting, with the 0.75 mm model showing a maximum of 7.61%. In contrast, the 1 mm model stabilized quickly after initial fluctuations. Velocity and streamline analyses also confirmed that asymmetry promotes swirl and backflow. These findings highlight the importance of orifice alignment in achieving stable valve performance.

목차

Abstract
1. 서론
2. 전산유동해석
2.1 해석 모델
2.2 Mesh
2.3 Methodology
2.4 Results and Discussion
3. 결론
References

키워드

저자

• 곽효서 [ Hyo-seo Kwak | Assistant professor, Mechanical Engineering Major, Dong-Eui University ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국기계항공기술학회지(구 한국기계기술학회지) [Journal of the Korean Society of Mechanical and Aviation Technology ]

• 간기

  격월간

• pISSN

  1229-604X

• eISSN

  2508-3805

• 수록기간

  1999~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 550 DDC 620