Flow model and dynamic characteristics of a direct spring loaded poppet relief valve

Lei, Jiehao; Tao, Jianfeng; Liu, Chengliang; Wu, Yajin

doi:10.1177/0954406217707546

Cited by 20 publications

(12 citation statements)

References 19 publications

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“…Aiming at the important topic of reverse flow control in the nuclear industry, Lai et al 12 numerically revealed the internal flow field evolution inside the check valve during the opening process. A novel flow discharge coefficient function for conveniently deriving the fluid force and flow rate change was established by Lei et al 13 to have a better understanding of internal flow and body movement of the poppet relief valve. To highlight the effect of the pipe length on discharge variation, Ferreira et al 14 experimentally characterized the discharge behavior of the ball valve under steady and unsteady flow conditions.…”

Section: Introductionmentioning

confidence: 99%

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Study on the eccentric jet-flow characteristics induced by the opening regulation with a gate valve

Chen

Wang

Liu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Valve-induced flow characteristics were often concerned in many fluid transportation and control industries. In this paper, the eccentric jet-flow characteristics induced by a gate valve have been studied by considering the influence of valve opening regulation. The experimental setup of monitoring the downstream pressures along the pipeline was developed, and corresponding numerical simulation was employed. The downstream-monitoring pressure distribution caused by valve opening regulation was investigated to verify the flow simulation. The generation mechanism of eccentric jet-flow was revealed as a strong pressure gradient caused by the throttling effect at the valve throat. It was found that the eccentric jet-flow evolved in the pipeline was accompanied by shearing vortices, extremely under a small valve opening. The pressure and axial velocity distributions at various downstream cross-sections of the eccentric jet-flow evolving in the pipeline were analyzed. The axial velocities on four monitoring lines in downstream cross-sections were extracted, and the radial location of the maximum axial velocity was derived to assess the eccentric characteristics of jet-flow. A dimensionless parameter of velocity eccentric ratio was introduced to quantify the eccentric intensity of the evolving jet-flow in the downstream pipeline, and its correlation with the pipeline length could be adequately expressed by a natural decreasing exponential curve via fitting analysis. By virtue of that correlation, the critical pipeline length was proposed that can be used as the judgment to the terminal of the eccentric jet-flow evolving in the downstream pipeline. This study was helpful to characterize the valve-induced flow characteristics in scientific research and provide useful insight into fluid and mechanical engineering.

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Section: Introductionmentioning

confidence: 99%

“…Figure13. Axial velocity on monitoring lines in various downstream cross-sections under valve openings of 20%, 50%, and 80%.…”

mentioning

confidence: 99%

Study on the eccentric jet-flow characteristics induced by the opening regulation with a gate valve

Chen

Wang

Liu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Direct-acting relief valve is widely applied for pressure adjustment in fuel pump [1][2][3][4][5]; when it is used underwater for torpedo, its stability is generally affected by the ocean environment. Specifically, as there is pressure fluctuation at the relief valve due to the influences of water depth, the valve element can lose its stability via Hopf bifurcation [6][7][8] and can further enter into chaos via grazing bifurcation due to the axial impact between the valve element and valve seat [6,[9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modelling and Dynamic Analysis of a Direct‐Acting Relief Valve Based on Fluid‐Structure Coupling Analysis

Song¹,

Yang²,

Zhang³

2021

Shock and Vibration

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To explain the sudden jump of pressure as the variation of water depth for a direct-acting relief valve used by torpedo pump as the variation of water depth, a 2-DOF fluid-structure coupling dynamic model is developed. A nonlinear differential pressure model at valve port is applied to model the axial vibration of fluid, and a nonlinear wake oscillator model is used to excite the valve element in the vertical direction; meanwhile, the contact nonlinearity between the valve element and valve seat is also taken into consideration. Based on the developed dynamical model, the water depths for the sudden jumps of pressure can be located precisely when compared with the experimental signals, and the corresponding vibration conditions of the valve element in both the axial and vertical directions are explored. Subsequently, in order to eliminate the sudden jumps of pressure, different pump inlet pressure was tested experimentally; when it was decreased to 0.4 MPa, the pressure jumps ever appeared during the dropping and lifting processes were removed, and the numerical simulation based on the developed mathematical model also verified the experimental measurements.

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“…By using Fluent 15.0 to conduct steady-state computation for the triple eccentric butterfly valve, Sun et al [18] discovered that the surface roughness may result in a big difference between the flow coefficient obtained by simulation without friction and the actual flow coefficient. The second type of research [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] focuses on the whole system rather than the valve, and thus generally uses the traditional 0D throttling flow-rate equation instead of the momentum equation to describe the dynamic throttling effect of the valve spool. In order to accurately describe the throttling effect, this simplified modeling method must take flow-rate equation, flow coefficient calculation, and valve-spool opening and closing rule into full consideration.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Full-Process Simulation of the Core Engine Test Rig Main Test System

et al. 2021

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As a virtual digital model that can reflect physical entities or systems, digital twins are revolutionizing industry. The first prerequisite for the construction of digital twins is the establishment of high-precision and complex entities or system models. A 47-components numerical system is established for the core engine test rig main test system by using the finite volume modularization modeling method. A comprehensive solution to the system-level valve-spool/orifice throttling modeling, the key issue of the fluid pipeline system modeling, is presented, and the algorithms of throttling and mixing are deepened and expanded. The full-process simulation study on two tests of normal-temperature 1400 s and low-temperature 1240 s shows that the combined regulation of five regulator valves and the change of cold source directly decide dynamic change of the system in each stage; the simulation reveals the phenomena such as the gas cylinder cooling with deflation, the air cooling when expanding from main pipeline to two branch pipelines, shunting flow by branch pipeline, and the cold and hot gases mixing; the overall variation trends of the simulation curves are consistent with those of all the experimental curves of the test rig normal-temperature/low-temperature air supply lines, exhaust bypass, and engine main line in two operating conditions, and the maximum error between simulation curves and test curves of pressure, total pressure, and total temperature is less than 12%. The numerical system can be used for the construction of virtual models of digital twins, and the modeling method provides a feasible solution to the key technology of digital twins.

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Flow model and dynamic characteristics of a direct spring loaded poppet relief valve

Cited by 20 publications

References 19 publications

Study on the eccentric jet-flow characteristics induced by the opening regulation with a gate valve

Study on the eccentric jet-flow characteristics induced by the opening regulation with a gate valve

Mathematical Modelling and Dynamic Analysis of a Direct‐Acting Relief Valve Based on Fluid‐Structure Coupling Analysis

Dynamic Modeling and Full-Process Simulation of the Core Engine Test Rig Main Test System

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