Flow analysis in valve with moving grids through CFD techniques

Srikanth, C.; Bhasker, C.

doi:10.1016/j.advengsoft.2008.04.003

Cited by 48 publications

(21 citation statements)

References 5 publications

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“…Wu [12,13] analyzed the flow characteristics of servo valve in the laminar and turbulent state by means of experiment. Srikanth and Bhasker [14] studied the formation and development of vortices in the flow field of hydraulic valves based on the dynamic grid technology. Pace et al [15] studied the flow coefficient of the spool valve orifice and the liquid change of the internal flow field.…”

Section: State Of the Artmentioning

confidence: 99%

Energy Dissipation Mechanism and Control Model of a Digital Hydraulic Damper

Wang

Qiu

Zeng

et al. 2019

Shock and Vibration

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In order to achieve the high efficiency and stable cushioning effect under the uncertain impacting situation, a digital hydraulic damper is developed which can adjust the whole buffering capacity so as to be adaptable to the impacting load on time during the buffering process. In the paper, the mechanism of energy dissipation in the digital hydraulic damper and the whole damping process are studied. The relationship between the energy dissipation process and the control process is given. Firstly, the energy dissipation process of the digital throttling unit is studied, and the mathematical model of energy losses of the digital hydraulic damper unit and the energy dissipation model of the whole digital damper are established. The energy dissipation model of the digital hydraulic buffer is proposed. Secondly, the effect on energy losses caused by the three elements of the digital damper, which are the sudden extension of cross section, form of orifice, and form of cone valve port, is analyzed. Finally, based on the energy dissipation model, the control model of the energy dissipation process is given, which lays a theoretical foundation for detailed structural design and control optimization.

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Section: State Of the Artmentioning

confidence: 99%

Energy Dissipation Mechanism and Control Model of a Digital Hydraulic Damper

Wang

Qiu

Zeng

et al. 2019

Shock and Vibration

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show abstract

“…CFD simulation was also used to investigate the dynamic characteristics of valves. 4,6,13,14 For example, Srikanth and Bhasker 14 investigated the compressible air flow in the valve of a puffer chamber using moving grid technique in CFD simulation. Qian et al 13 studied the opening process of a pilot-control globe valve through a user-defined function (UDF) program of the valve core's movement.…”

Section: Introductionmentioning

confidence: 99%

A simple method for high-precision evaluation of valve flow coefficient by computational fluid dynamics simulation

Zhou

Wang

Yi-fang³

2017

Advances in Mechanical Engineering

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Flow coefficient is an important performance index associated with the energy efficiency of a valve, and an effective method to evaluate valve flow coefficient is necessary for valve industry. However, theoretical estimation often results in poor accuracy, while experimental measurements involve significant costs in time and equipment. In this article, a computational fluid dynamics method is proposed to achieve simple and accurate evaluation of valve flow coefficient. For each valve, a computational fluid dynamics model is established containing a valve section, an upstream section, and a downstream section. A grid-adaptation strategy is then applied to improve the accuracy of simulation. To calculate flow coefficient, the most important issue is to determine the net pressure loss induced by valve (DP v). Herein, the overall pressure drop (DP o) is obtained first, and the pipe-induced pressure drop (DP p) is estimated by linear fitting. Then, DP v is calculated as the difference between DP o and DP p. To ensure accurate estimation of the pressure losses, a length of 26 times of pipe diameter is preferred for the upstream section. The experiments demonstrated that the presented method can accurately predict flow coefficient for various types of valves and thus has great potential to be widely used in the valve industry.

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“…In the process of large erecting equipment,the hydraulic cylinder is constantly extended to drive the load to rotate around the hinge point.At each level, the change of level have a limited collision.It is easy to have a big impact on the load,also not conducive to the stability of the vertical process [1].In order to slow down the impact of vibration,buffer device is arranged inside the cylinder body in the buffer stage. With the extension of the cylinder, the throttle gap is gradually reduced .The oil has damping effect,so the speed of the hydraulic cylinder can be reduced at the change stage to achieve the purpose of reducing the impact vibration.In earlier studies,most of them focused on the mathematical model of fluid characteristics in the vicinity of the hydraulic cylinder buffer device with more accurate throttle model to describe the buffering process,without consideration of the fluid-structure interaction effect [2,3].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Buffer Device in Large Erecting Hydraulic Cylinder Based on ANSYS

Li¹,

Xie²,

Feng³

2016

Proceedings of the 2016 2nd Workshop on Advanced Research and Technology in Industry Applications

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The level exchanging buffer of large erecting hydraulic cylinder is one of the core issues in the process of rapid erecting equipment development. This paper combines the actual, building analysis platform of fluid-structure interaction by using fluent and workbench,researching the effect of the change of flow field and fluid-structure interaction on the structure of buffer throttling when the throttle device in different buffer position. The results show that the hydraulic cylinder buffer zones have obvious pressure gradient.The effect of fluid-structure interaction reflected in the pressure gradient of cylindrical flow field lead to the overall strain values of buffer device coupling surface produce gradient change.

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Flow analysis in valve with moving grids through CFD techniques

Cited by 48 publications

References 5 publications

Energy Dissipation Mechanism and Control Model of a Digital Hydraulic Damper

Energy Dissipation Mechanism and Control Model of a Digital Hydraulic Damper

A simple method for high-precision evaluation of valve flow coefficient by computational fluid dynamics simulation

Finite Element Analysis of Buffer Device in Large Erecting Hydraulic Cylinder Based on ANSYS

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