A Review Analysis of Unsteady Forces in Hydraulic Valves

Vescovo, Giuseppe Del; Lippolis, Antonio

doi:10.1080/14399776.2006.10781256

Cited by 17 publications

(8 citation statements)

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“…These are mostly simulations for steady-state conditions, where the flow parameters are known, and the valve control component positions are fixed. The first CFD simulations on flow forces in hydraulic valves were focused on verification theory, as presented in the Introduction and Equation (10). Borghi et al [6] used the 2D axisymmetric model to verify the jet angle and the reasons for the differences.…”

Section: Cfd Simulations Of Steady-state Flow Forcesmentioning

confidence: 99%

“…F ax = 0.36ρQu 2 (11) For poppet valves, the jet angle θ = α. According to Blackburn [5], Equation (10) is valid for the flow direction presented in Figure 1 as well as for the reverse one. The jet angle θ depends on angles ψ and ζ and the flow direction.…”

mentioning

confidence: 99%

“…Another indicated reason is the assumption that a two-dimensional flow might not entirely reflect the nature of flow in a real valve. An attempt to evaluate the dynamic component of flow forces during oil flow inside the spool control valve was taken by Del Vescovo et al [10]. He also employed the momentum theory approach to evaluate the unsteady component of axial flow forces, which arise from the momentum of oil captured inside the valve chamber.…”

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confidence: 99%

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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 Steady-state Flow Forcesmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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

Domagala,

Fabis-Domagala

2023

Energies

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“…Once the threshold condition is satisfied during simulation, the solver stops and the 2-D model will be remeshed in reference to the initial mesh settings and then simulation continues. A similar technique called "dynamic mesh" was adopted to investigate the unsteady forces in a spool valve (Vescovo and Lippolis, 2006). More detailed descriptions of mesh movement and automatic meshing can be found in the COMSOL Multiphysics Users Guide (2012).…”

Section: International Journal Of Fluid Power 59mentioning

confidence: 99%

Coupled Physics Modelling for Bi-Directional Check Valve System

Xiong

Lumkes

2014

International Journal of Fluid Power

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This paper describes the development of a high speed on/off bi-directional check valve. The design was characterized using coupled-physics modelling tools, and a prototype was constructed and tested in the laboratory. The simulated and experimental results were compared. The high speed on/off bi-directional check valve (BDCV) utilizes positive feedback of flow forces and differential port pressure to quickly open and close the primary poppet. The coupled-physics model incorporates mechanical and fluid domains, which was solved through conducting finite element analysis (FEA) on a 2D planar model. After characterizing the BDCV, the system model was expanded for a single piston pumping system using two BDCVs and the simulation on system full displacement pumping was conducted. The modelling results showed a moderate agreement with measurements, which demonstrated the capability of the coupled physics model to effectively investigate the dynamic performances of a BDCV operating in a digital pump system.

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“…Οι Del Vescovo κ.α. χρησιμοποιούν μεθόδους υπολογιστικής ρευστομηχανικής για τον υπολογισμό των δυνάμεων που ασκούνται στα έμβολα των υδραυλικών βαλβίδων(52,53,54,55), ο Yang ακολουθεί μια παρόμοια μέθοδο στις παραπομπές(226) και (227), ο Fales αναλύει τη λειτουργία μιας στραγγαλιστικής βαλβίδας με κωνικό έμβολο στην παραπομπή (68) και ο Huguet αναλύει τη μοντελοποίηση ενός ασφαλιστικού στην παραπομπή (93). Οι Jeong και Kim μελετούν πειραματικά τη λειτουργία μιας υδραυλικής βαλβίδας τριών θέσεων στην παραπομπή (97), ενώ παρόμοια μεθοδολογία ακολουθούν οι Liu κ.α.…”

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Αναγνώριση Βλαβών Λειτουργίας Υδραυλικών Συστημάτων Υψηλών Πιέσεων

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A Review Analysis of Unsteady Forces in Hydraulic Valves

Cited by 17 publications

References 1 publication

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

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

Coupled Physics Modelling for Bi-Directional Check Valve System

Αναγνώριση Βλαβών Λειτουργίας Υδραυλικών Συστημάτων Υψηλών Πιέσεων

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