Investigation of poppet valve vibration with cavitation

Kumagai, Koji; Ryu, Shohei; Ota, Masahiro; Maeno, Kazuo

doi:10.1080/14399776.2015.1115648

Cited by 24 publications

(8 citation statements)

References 4 publications

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“…Oshima and Ichikawa (1985a, 1985b, 1986 provided the first visual evidence of cavitation inside a poppet valve, and revealed the overall distribution of cavitation and the induced effect on flow performance. Kumagai et al (2016) recorded the transient evolution of cavitation bubbles and the induced vibration under different operating conditions, with the aim of exploring the periodic characteristics of the flow force. Washio et al (2010) proposed an explanation for flow collapse of a poppet valve, and developed a new method in flow performance prediction.…”

Section: Introductionmentioning

confidence: 99%

“…Koukouvinis et al (2017) proposed a similar numerical method, and studied the correlation between the cavitation evolution and turbulence distribution. Previous experimental evidence (Kumagai et al, 2016) indicated that an intimate interrelationship exists between the periodic behavior of the cavitating bubbles and the induced pressure fluctuation inside a poppet valve, but the underlying mechanisms associated with the microscopic flow dynamics have not been thoroughly clarified. Notably, an earlier study on numerical methods for a transitional cavitating jet (Yuan et al, 2019b) motivated a two-dimensional transient simulation of the cavitating jet inside an oil poppet valve, which revealed the complicated correlation between cavitation evolution and flow performance.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation into the cavitating jet inside water poppet valves with varied valve seat structures

Yuan

Zhu

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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Owing to the strong three-dimensionality and transient evolution, the flow dynamics of a cavitating jet inside a water poppet valve is poorly understood, leading to insufficient basis for exploring the governing mechanism of cavitation effects. In this paper, a three-dimensional simulation considering the compressibility of each constituent phase is performed, to clarify the governing mechanisms under the cavitating flow inside two water poppet valves. The cavitation structures inside the poppet valves are primarily located at three regions and triggered by different mechanisms. The vortex cavitation, mainly confined within the free shearing layer, is due to vortex dynamics, while the attached cavitation at the poppet trailing edge and within the chamfered groove arises from flow separation. The fast laminar-turbulent transition process contributes to the three-dimensionality within the free shearing layer and the rear part of the chamfered groove. The flow separation due to the chamfered groove leads to increased velocity of the central potential core, contributing to a different flow discharge performance from that of the poppet valves with a sharp seat. In addition, the periodic variation in cavitation reveals the significant interaction between the shed cavitating vortex and attached cavitation at the poppet trailing edge. In conclusion, the change in velocity distribution due to different poppet valve seat structures leads to variation in flow discharge performance, and the vortex dynamics makes sense for all three kinds of cavitation occurring inside poppet valves.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation into the cavitating jet inside water poppet valves with varied valve seat structures

Yuan

Zhu

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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“…Kumagai et al. 23–25 studied the stability of the internal flow poppet valve using a visualisation experiment method. They observed and analysed the relationship among poppet displacement, cavitation quantity and the pressure at the port.…”

Section: Introductionmentioning

confidence: 99%

Visual experimental investigation on the stability of pressure regulating poppet valve

Wei

Wang

Zheng

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The unstable vibration of a poppet valve drastically fluctuates pressure which directly affects the stability, reliability and safety of a hydraulic system. The unstable vibration of the poppet and cavitation is studied using visual experiments. Experimental results show that for a poppet valve, an orifice at the front of the valve cavity, the compressibility of oil in the sensitive cavity will lead poppet to unstable vibrations. For poppet valve without orifice, the instable vibration appears as three states: impact valve seat, transition (impact or non-impact valve seat occurs randomly) and does not impact valve seat. When poppet impacts valve seat, there will be severe cavitation phenomenon at the valve port. Although poppet does not impact valve seat, the cavitation come up is affected by the pressure difference at the port or vibration amplitude of the poppet. In addition, both of the flow pulsation of the hydraulic pump and the coupling between the poppet and pipeline system will lead the poppet to be unstable.

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“…Cavitation is one of the main causes of the vibration of the throttle valve. The cavitation vibration may seriously affect the performance of hydraulic systems, by reducing the efficiency, noise and the change in the characteristics of the flow rate [1–3]. In order to design the oil hydraulic valves with a longer life and higher quality performances, it is very important to study the cavitation vibration characteristics of the throttle poppet valve.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of oil and water flow unsteadiness on cavitation phenomena are also investigated by many researchers [12–14]. Kumagai [1, 2] mainly used visualisation and simulation technologies to study the vibration in a hydraulic poppet valve.…”

Section: Introductionmentioning

confidence: 99%

Vibration characteristics of the two‐stage throttle valve induced by cavitation

Yan

et al. 2018

J. eng.

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Investigation of poppet valve vibration with cavitation

Cited by 24 publications

References 4 publications

Numerical investigation into the cavitating jet inside water poppet valves with varied valve seat structures

Numerical investigation into the cavitating jet inside water poppet valves with varied valve seat structures

Visual experimental investigation on the stability of pressure regulating poppet valve

Vibration characteristics of the two‐stage throttle valve induced by cavitation

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