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CFD를 이용한 EPPR 밸브 유동력 특성 분석 및 시뮬레이션

Simulation of EPPR Valve Flow Force Characteristic using CFD Analysis

  • 투고 : 2016.11.29
  • 심사 : 2017.02.02
  • 발행 : 2017.03.01

초록

Flow force is the additional unbalanced force acting on the valve spool by fluid flow, excluding the static pressure force that is offset on the spool land wall at the same magnitude. When designing the valve spool, it is assumed that the same average value of static pressure is applied to the inlet and outlet spool land wall in one chamber. However, the high velocity of the fluid flow by the inlet or outlet metering orifice creates unbalanced pressure distribution and generates additional force in the opposite direction to that of the solenoid attraction force. This flow force has a negative effect on the control performance of the EPPR valve, which needs to develop uniform output pressure along the entire spool control range. In this study, we developed a 3D model of the EPPR valve and conducted flow force characteristic analysis using CFD S/W (ANSYS FLUENT). The alleviated flow force model was derived by adjusting the design parameters of the spool notch.

키워드

참고문헌

  1. W. G. Shin, H. Y. Choi, H. P. Shin and E. J. Moon, "Flow Force Compensation by Stepped Spool Valve", J. of the Korean Society for Precision Engineering, Vol.20, No.6, pp. 145-150, 2003.
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  7. S. N. Yoon, J. S. Ryu and B. K. Ahn "Understanding of the Proportional Solenoid Characteristics", J. of the Korean Society of Mechanical Engineers, Vol.9, No.3, pp. 76-85, 2005.
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피인용 문헌

  1. Independent Metering Valve: A Review of Advances in Hydraulic Machinery vol.17, pp.4, 2017, https://doi.org/10.7839/ksfc.2020.17.4.054
  2. 변탄성 스프링을 이용한 고정밀 직동형 릴리프 밸브 vol.17, pp.4, 2017, https://doi.org/10.7839/ksfc.2020.17.4.087