A numerical study of flow field in a flapper-nozzle pilot valve with a moving flapper

Lv, Xinbei; Li, Songjing; Zhang, Shengzhuo

doi:10.1109/aus.2016.7748127

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…The youngest technology of moving mesh, known as the overset mesh, seems very promising in the simulation of the spool and poppet valves. Lv et al [45] used the overset mesh technique for the simulation of oil flow in the two-stage flappernozzle pilot valve while the flapper was moving. The potential usage of this method for the flow simulation of the poppet valve is shown in Figure 12.…”

Section: Cfd Simulations Of Transient Flow Forcesmentioning

confidence: 99%

A Review of the CFD Method in the Modeling of Flow Forces

Domagala,

Fabis-Domagala

2023

Energies

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Hydraulic valves are key components of fluid power systems. They control the flow rate and pressure in hydraulic lines, actuator motion, and direction. Valves that control flow rate or pressure can be divided into two main categories: spool-type valves, where control components are similar to the piston inside a sleeve with control orifices; and seat-type valves, in which a poppet inside a seat opens and closes the flow. Forces induced on valve components during oil flow are crucial to the valve’s operational capabilities. They can be calculated using a formula originating from the momentum conservation equation for a two-dimensional control volume. Increasing demands for flow rate and pressure control accuracy cause flow forces to be calculated much more accurately than when using the analytical formula. Therefore, computational fluid dynamics (CFD) simulations are the only effective tool for their calculation. This paper reviews the CFD approaches used for calculating flow forces inside hydraulic valves. It presents typical approaches used for evaluating flow forces inside hydraulic valves. The oldest and most common are conducted for a fixed position of valve components for defined flow conditions, which do not cover all components of flow forces. The dynamic flow forces can be calculated using more complex CFD models using fluid–structure interaction (FSI) techniques. This paper presents available FSI techniques for the simulation of transient flow forces, mainly for valves whose component position is determined by the forces occurring during oil flow.

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Section: Cfd Simulations Of Transient Flow Forcesmentioning

confidence: 99%

A Review of the CFD Method in the Modeling of Flow Forces

Domagala,

Fabis-Domagala

2023

Energies

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“…Numerous researchers focus on the analysis of flow field in various pilot valves by computational fluid dynamics (CFD) methods. Lv et al 2 presented the flow field characteristics in a flapper-nozzle pilot valve when the flapper is moving, which reflects the actual operational conditions. Yuan and Guo 3 developed complete models of the pilot relief valve using deformation theory of thin plates.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of pilot valve system using linear flow resistance

Peng

Youn

Takeuchi

et al. 2017

Advances in Mechanical Engineering

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In a pilot valve system, the pressure in the control chamber of the main valve is straightforwardly affected by pressure oscillation in the downstream pipeline or the pilot tube. To solve this problem, an orifice is generally installed in the pilot tube to restrain the oscillation. However, the orifice is a nonlinear flow resistance; the amplitude of the oscillation alters the gain curve of the control pressure response. In this study, a linear flow resistance such as a porous material is employed to stabilize the pilot valve system. A test pilot valve was manufactured, and a pilot valve system was developed in the laboratory of the authors of this article. A mathematical model of the pilot valve system using linear and nonlinear flow resistances was simulated in MATLAB. The linearity of the P-Q characteristics of the linear flow resistance was confirmed, and a series of frequency response experiments were performed to examine the dynamic characteristics of the pilot valve system with various flow resistances. The experimental results were in accord with the simulation results. This implied that when porous materials were used in the pilot valve system, the gain of the pressure response did not vary regardless of the varying pressure vibration amplitude. Therefore, porous materials are suitable to be used in the pilot valve system instead of an orifice to enhance its stability.

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Performance and Flow Field Analysis of Flapper Deflection Servo Valve

Vladimir

2018

2018 Global Fluid Power Society PhD Symposium (GFPS)

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A numerical study of flow field in a flapper-nozzle pilot valve with a moving flapper

Cited by 3 publications

References 15 publications

A Review of the CFD Method in the Modeling of Flow Forces

A Review of the CFD Method in the Modeling of Flow Forces

Stabilization of pilot valve system using linear flow resistance

Performance and Flow Field Analysis of Flapper Deflection Servo Valve

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