Thrust of Poppet Valve

Urata, Eizo

doi:10.1299/jsme1958.12.1099

Cited by 17 publications

(14 citation statements)

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“…The chamfered popped study took into account the length of the cone seat, deducing that as the length increased for a constant cone valve was found to be less prone to cavitation than the sharp-edged one, which di ered from that found by angle, the Reynolds number also had to increase to achieve turbulent ow. Also, as the cone angle increased, Urata [2] who showed experimentally and analytically that cavitation was more likely to occur when using the Reynolds number had to increase to achieve turbulent ow. The uid used was a chemical mixing between chamfered seats.…”

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confidence: 99%

“…This paper gave an introduction to previous work and pointed out that putational uid dynamics (CFD) simulation for a range of conical seat valve geometries, the ow being turbulent until 1992 very few people attempted to describe mathematically the characteristics of disc and popped valves and incompressible. The aim of the work was to study the reattachment and separation of the ow, the vortex with chamfered seats [2,9,10]. In all these studies a set of assumptions had to be considered, and the research created at the outlet and its relation to the ow forces acting on the spool.…”

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“…The equations developed exit [1,7,8,[12][13][14], which happened to be linked to are generic and the uid considered is mineral oil ISO 32. the discharge coe cients and the ow forces. In other studies, the in uence of the length of the conical seat has been taken into consideration [1][2][3][4][5]7, 8], relating in 2 LAMINAR FLOW ACROSS A CONICAL WAVE some cases the length with the valve stability and/or ow separation. In almost all studies the ow is assumed to 2.1 Theoretical background be turbulent, or no consideration is made upon this point.…”

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confidence: 99%

“…The volumetric at small gaps the ow could be laminar [1, 2, 10], ow through the gap can be de ned as especially when the uid is mineral oil. It seems that only Urata [2] has considered a theoretical basis for the (8) and (9) it can be concluded that bution between the two surfaces according to the Poiseulle…”

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A direct solution for flowrate and force along a cone-seated poppet valve for laminar flow conditions

Bergadà¹,

Watton

2004

Proceedings of the Institution of Mechanical Engineers, Part I:

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A new set of equations is developed, giving insight into the ow and pressure distribution across poppet valves with large cone-shaped seats. The equations apply for laminar ow, which appears when the length of the seat is much greater than the valve opening gap, and are a useful design tool for applications where a linear pressure/ ow characteristic could be a distinct control advantage. The momentum equation is also applied to determine the static forces on the conical spool and it is con rmed that, for small chamfered-type seats, momentum forces can still play a decisive role on the total force. However, as the length of the seat increases to a cone type the dominant role is then played by the pressure forces acting on the seat, producing a much more predictable valve characteristic. The new equations allow accurate design of the seat length to minimize this static force variation. In order to validate the equations developed, a three-dimensional computational uid dynamics (CFD) analysis of the ow along the valve seat has been performed and a test rig was designed to check experimentally the pressure distribution and ow along such a valve. Very good agreement has been obtained between experimental, CFD and theoretical pressure/ ow results.on the spool. For the last 40 years poppet valves have I09803

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A direct solution for flowrate and force along a cone-seated poppet valve for laminar flow conditions

Bergadà¹,

Watton

2004

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…2 where I 1 and I 2 denotes the momentum flux of the flow entering and leaving the control volume, P 1 and P 2 constitutes the net force due to pressure distribution at the upstream and downstream side of the control volume, while F fluid stands for the force exerted by the fluid on the valve. As [17] pointed out, the pressure forces can be expressed simply by P 1 = A 1 p 1 , and P 2 = A 1 p 2 , while the momentum flux terms can be assumed to be…”

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confidence: 99%