Numerical investigation on cavitating jet inside a poppet valve with special emphasis on cavitation-vortex interaction

Yuan, Cong; Jun, Song; Zhu, Lisha; Liu, Minghe

doi:10.1016/j.ijheatmasstransfer.2019.06.105

Cited by 38 publications

(11 citation statements)

References 43 publications

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“…Validation of the current numerical model was performed to ensure the accuracy of simulated results (Chen et al, 2016;Yuan et al, 2019). The single-stage perforated plate model selected for comparison was based on the dimensions adopted by a previous study (Qian et al, 2019b).…”

Section: Validation Of Numerical Modelmentioning

confidence: 99%

3D numerical investigation of energy transfer and loss of cavitation flow in perforated plates

Fang

Wang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Perforated plates are prevalently used in various integrated energy systems for flow restriction, vibration, and noise reduction. The characteristics of flow energy transfer and loss in perforated plates have a significant impact on its piping systems. The existing design and previous studies largely paid little attention to the characteristics of flow energy variation, resulting in severe performance issues and energy consumption. In this study, the characteristics of energy transfer and loss of cavitation flow with various pressure ratios in single and multi-stage perforated plates were numerically studied. The parameters of energy ratio and energy gradient were developed to effectively evaluate the degree and rate of flow energy variation. Results showed that the contribution to energy loss generated from orifice outlet was relatively larger than the inlet and that the degree and rate of energy variation deceased with the increasing stages during the flow in multi-stage models. Additionally, increased stages of perforated plate resulted in a multi-stage stepped energy drop in throttling orifices, and lead to obvious suppression of the cavitation. This work intends to provide references to cavitation control and energy consumption optimization in piping systems using a perforated plate.

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Section: Validation Of Numerical Modelmentioning

confidence: 99%

3D numerical investigation of energy transfer and loss of cavitation flow in perforated plates

Fang

Wang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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“…Liang et al [15] pointed out that vortex flow is the reason for the occurrence of the cavitation bubble. Yuan et al [16] investigated the internal flow dynamics inside a poppet valve, specially made emphasis on cavitation-vortex interaction. Qiu et al [17] discussed the pressure drop, velocity, and vapor volume distribution in the regulating valves, and they pointed out that the effects of the pressure difference on the cavitation intensity.…”

Section: Introductionmentioning

confidence: 99%

Study on Unsteady Cavitation Flow and Pressure Pulsation Characteristics in the Regulating Valve

Liu

et al. 2021

Shock and Vibration

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A combined numerical-experiment investigation on the unsteady cavitation flow and pressure fluctuation characteristics in the regulating valves is conducted in this paper. The cavitation flow in the regulating valve is an unsteady and periodic flow which could be divided into fixed and travelling cavitation bubbles. The fixed cavitation bubbles are formed in the gap in the initial stage and then fell off and formed the travelling cavitation bubbles because of the re-entrant jet. The travelling cavitation bubbles move downstream, oscillate, and break up into several smaller bubbles. Changes in the length/radius ratio (L/R0) of the valve spool is an important factor affecting unsteady cavitation flow and pressure pulsation characteristics in the regulating valve. The length of travelling cavitation bubbles increases firstly and then decreases with increasing time. With the increase of the length/radius ratio (L/R0), the oscillation period of cavitation bubbles also increases. In the initial stage of cavitation bubbles, the velocity distribution inside the regulating valve is relatively stable, and no re-entrant jet could be found although L/R0 is different. In the collapse stage of cavitation bubbles, the velocity distribution becomes extremely unstable because the collapsing cavitation bubbles affect the pressure drop and velocity field in the flow channel. Furthermore, the amplitude of pressure pulsation increases gradually, and the peak time of the pressure pulsation is gradually delayed while increasing the length/diameter ratio.

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“…This periodic pressure shock will change the dynamic characteristics of the flow field, also causing strong vibration and noise. In addition, the reentrant jets and shock waves formed during cavitation collapse can cause high-pressure pulsations on the surface of the material [15][16][17]. Wang et al [18] performed numerical calculations of the transient characteristics of cloud cavitating flows and shock wave dynamics.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Temperature on the Temporal and Spatial Distribution Characteristics of Natural Cavitating Flow around a Vehicle

Sun

Zhang

et al. 2020

JMSE

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Cavitation involves complex multiphase turbulence and has important research significance. In this study, the Schnerr–Sauer cavitation model was used to model cavitation, and the detached-eddy simulation (DES) method was used to calculate the unsteady natural cavitating flow. The predicted results are in good agreement with experimentally measured cavity evolution and pressure values, demonstrating the effectiveness of this numerical method. Low temperature causes changes in the properties of water. The density of water at 0° is 999.84 kg/m3 and the density of water at 25° is 997.04. Cavitation evolution and shedding are analyzed at temperatures of 0 °C and 25 °C. The results showed that lower temperature increased the frequency of cavitation and enhanced pressure pulsation. At the same time, low temperature also increases the frequency of cavity shedding and shortens the cycle. In addition, based on the Ω method, the difference between vortex dynamics at various temperatures was studied, and it was found that different cavity stages showed different vortex structure characteristics, and lower temperature would aggravate the change of wake vortex structure. At the same time, the analysis of the turbulence characteristics in the downstream of the cavity shows that the lower temperature reduces the velocity pulsation and reduces the turbulence integral scale. At the end of the model, large-scale pulsations are transformed into small-scale pulsations.

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Numerical investigation on cavitating jet inside a poppet valve with special emphasis on cavitation-vortex interaction

Cited by 38 publications

References 43 publications

3D numerical investigation of energy transfer and loss of cavitation flow in perforated plates

3D numerical investigation of energy transfer and loss of cavitation flow in perforated plates

Study on Unsteady Cavitation Flow and Pressure Pulsation Characteristics in the Regulating Valve

Study on the Influence of Temperature on the Temporal and Spatial Distribution Characteristics of Natural Cavitating Flow around a Vehicle

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