Dynamic Characteristics of Swing Check Valve Based on Dynamic Mesh and UDF

2013 ◽  
Vol 321-324 ◽  
pp. 86-89
Author(s):  
Shu Xun Li ◽  
Ying Zhe Hou ◽  
Lian Cui Li
Keyword(s):  
Dynamic Characteristics ◽  
Working Condition ◽  
Check Valve ◽  
Internal Flow ◽  
Dynamic Mesh ◽  
Motion Model ◽  
Valve Design ◽  
Transient Dynamic Analysis ◽  
Modified Model ◽  
Dynamic Numerical Simulation

In view of the transient dynamic analysis in opening swing check valve, the motion model of valve clack is built, two-dimensional dynamic numerical simulation of the internal unsteady flow is performed by using dynamic mesh and UDF in opening two kinds of swing check valve at the same working condition, the visualized results are obtained. The results show that internal flow field of the modified model become more stable, the noise, impact and the local energy loss are decreased, the service life is improved obviously; an important reference for swing check valve design and analysis of dynamic characteristics are provided by the research results.

scholarly journals J051041 Analysis on Dynamic Characteristics of a Rocket Pump Internal Flow

2011 ◽  
Vol 2011 (0) ◽  
pp. _J051041-1-_J051041-5
Author(s):  
Takashi SHIMURA ◽  
Satoshi KAWASAKI ◽  
Masaharu UCHIUMI ◽  
Mitsuaki HAYASHI ◽  
Jun MATSUI
Keyword(s):  
Dynamic Characteristics ◽  
Internal Flow

scholarly journals A thermodynamic cavitation model applicable to high temperature flow

2011 ◽  
Vol 15 (suppl. 1) ◽  
pp. 95-101 ◽  
Author(s):  
De-Min Liu ◽  
Shu-Hong Liu ◽  
Yu-Lin Wu ◽  
Hong-Yuan Xu
Keyword(s):  
High Temperature ◽  
Pressure Coefficient ◽  
Internal Flow ◽  
Mass Transfer Equation ◽  
Modified Model ◽  
Cavitation Characteristic ◽  
Different Temperatures ◽  
Thermodynamic Effects ◽  
Temperature Depression ◽  
Latent Heat Of Vaporization

Cavitation is not only related with pressure, but also affected by temperature. Under high temperature, temperature depression of liquids is caused by latent heat of vaporization. The cavitation characteristics under such condition are different from those under room temperature. The paper focuses on thermodynamic cavitation based on the Rayleigh-Plesset equation and modifies the mass transfer equation with fully consideration of the thermodynamic effects and physical properties. To validate the modified model, the external and internal flow fields, such as hydrofoil NACA0015 and nozzle, are calculated, respectively. The hydro-foil NACA0015?s cavitation characteristic is calculated by the modified model at different temperatures. The pressure coefficient is found in accordance with the experimental data. The nozzle cavitation under the thermodynamic condition is calculated and compared with the experiment.

scholarly journals Study of the nozzle check valve with respect to its operating characteristics

2018 ◽  
Vol 180 ◽  
pp. 02044 ◽  
Author(s):  
Roman Klas ◽  
Vladimír Habán ◽  
Pavel Rudolf
Keyword(s):  
Cfd Simulation ◽  
Check Valve ◽  
Operating Characteristics ◽  
Valve Design ◽  
Pressure Fields ◽  
Valve Disc ◽  
Unsteady Operation ◽  
Simulation Results ◽  
2D And 3D ◽  
Main Operating

Several modifications were developed when designing the nozzle valve. This study offers an assessment of the properties of new modifications of the nozzle valve design. The main operating characteristics, such as loss and flow coefficients, were determined using a CFD methods. Besides mentioned coefficients, the forces acting on the valve disc are also decisive for the behavior of the valve, both in its steady and unsteady operation. It is important to examine the possible simplification and matching of CFD simulation results from 2D and 3D geometries in terms of subsequent dynamic analysis of the valve. This will be taken into consideration by comparing the above-mentioned operating characteristics, by analyzing the forces acting on the valve disc and comparing the velocity and pressure fields.

scholarly journals Disposable miniature check valve design suitable for scalable manufacturing

2013 ◽  
Vol 203 ◽  
pp. 76-81 ◽  
Author(s):  
Anna I. Hickerson ◽  
Hsiang-Wei Lu ◽  
Kristina Roskos ◽  
Thomas Carey ◽  
Angelika Niemz
Keyword(s):  
Check Valve ◽  
Valve Design

Research on Dynamic Characteristics of Anti-Reverse Valve for Hydraulic Excavator Rotary Motor

2013 ◽  
Vol 871 ◽  
pp. 290-295
Author(s):  
Yan Lei Luo ◽  
Cong Guo Xu ◽  
Qiu Yan Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Hydraulic System ◽  
Working Condition ◽  
Great Influence ◽  
Hydraulic Excavator ◽  
Middle Chamber ◽  
Working Principle ◽  
The Impact ◽  
Rotary Motor ◽  
Amesim Simulation

Hydraulic excavator slewing system is an important component of the excavator and its core-component is the rotary motor. When the rotary hydraulic system starts, stops, and reciprocating works, dynamic characteristic of rotary motor anti-reverse valve has a great influence for working condition of the whole system. Through researching working principle of hydraulic system anti-reverse valve, establish dynamic mathematical model of anti-reverse valve, analyze dynamic response of the model, and get the theoretical foundation of the impact of anti-reverse valve middle chamber throttle opening on hydraulic system. According to the actual working condition of the excavator slewing hydraulic system, establish the system AMESim simulation model, take different parameters of the anti-reverse valve throttle opening, conduct simulation and analysis of the anti-reverse valve characteristics, and validate throttle opening has a great influence on dynamic characteristics of the hydraulic system.

Development of Enertech’s Advanced Normally Open NozzleCheck Valves for Generation III+ Nuclear Power Plants

2014 ◽  
Author(s):  
Haykaz Mkrtchyan
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Reverse Flow ◽  
Flow Direction ◽  
Fluid Dynamic ◽  
High Capacity ◽  
Check Valve ◽  
Operating Conditions ◽  
Flow Conditions ◽  
Valve Design

Enertech introduced the first Normally Open NozzleCheck valves to the nuclear power industry nearly 20 years ago. This passive valve design was developed to address reoccurring maintenance and reliability issues often experienced by various check valve types due to low or turbulent flow conditions. Specifically, premature wear on the hinge pins, bushings and severe seat impact damage had been discovered in several applications while the systems were in steady state operating conditions. Over the last two decades, Enertech has continued to improve upon the design of the valve, with the culmination coming most recently in support of Generation III+ passive reactor requirements. This entirely new valve is designed with minimal stroke, ensuring quick closure under low reverse flow conditions which no other check valve design could support. Additionally, features such as first in kind test ports, visual inspection points, and the ability to manually stroke the valve in line have resolved many of the short comings of previous inline welded flow check valves. Most importantly, advanced test based methodologies and models developed by Enertech, allow for accurate prediction of NozzleCheck valve performance. This paper presents the development of Enertech’s advanced Normally Open NozzleCheck Valve for Generation III and III+ nuclear reactor designs. The Valve performance was initially determined by using verified and validated computational fluid dynamic (CFD) methods. The results obtained from the CFD model were then compared to the data gathered from a prototype valve that was built and tested to confirm the performance predictions. Enertech has fully tested and qualified the Normally Open NozzleCheck valve which is specifically designed for applications that require a high capacity in the forward flow direction and a quick closure during low reverse flow condition with short stroke to minimize the hydraulic impact on the system.

Numerical Simulation of the Transient Flow in a Centrifugal Pump during Regulating Period

2011 ◽  
Vol 268-270 ◽  
pp. 1407-1410
Author(s):  
Yue Tang ◽  
Er Hui Liu ◽  
Ling Di Tang ◽  
Wang Hui
Keyword(s):  
Fluid Flow ◽  
Centrifugal Pump ◽  
Moving Boundary ◽  
Transient Flow ◽  
Pressure Fluctuations ◽  
Angular Acceleration ◽  
Internal Flow ◽  
Dynamic Mesh ◽  
Hydrodynamic Performance ◽  
State Process

Centrifugal pump performance has transient effect obviously during rapid changing period and the pump hydrodynamic performance of transient is different from steady-state process. In order to research the speed regulation characteristics and the inner flow mechanism of the centrifugal pump, numerical method of solving the unsteady fluid flow around the accelerating blade was established. The dynamical changes of the pressure and velocity were simulated by Fluent6.2, using standard k-epsilon turbulence model, PISO algorithm. The dynamic mesh technology and UDF were used to deal with the moving boundary caused by changing speed. Simulation results shown that faster angular acceleration made larger pressure fluctuations. Different regulated time had different influence in the system transient characteristics. And the evolution of the internal flow rate present strong transient performance in the regulating process. The study confirmed the feasibility of dynamic mesh method in solving the transient fluid flow during pump regulating period.

scholarly journals Dynamic Characteristics of a Check Valve for Drain Pumps.

2002 ◽  
Vol 68 (672) ◽  
pp. 2225-2231
Author(s):  
Kazuhide MIZOBATA ◽  
Hiromu SUGIYAMA ◽  
Kiyonobu OHTANI ◽  
Takashi OHISHI ◽  
Yuji SASAKI ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Check Valve

scholarly journals Analysis of Internal Flow Characteristics of a Startup Pump Turbine at the Lowest Head under No-Load Conditions

2021 ◽  
Vol 9 (12) ◽  
pp. 1360
Author(s):  
Wei Wang ◽  
Xi Wang ◽  
Zhengwei Wang ◽  
Mabing Ni ◽  
Chunan Yang
Keyword(s):  
High Speed ◽  
Pressure Pulsation ◽  
Working Condition ◽  
Guide Vane ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Operating Conditions ◽  
Small Range ◽  
Pressure Balance ◽  
Pump Turbine

The instability of the no-load working condition of the pump turbine directly affects the grid connection of the unit, and will cause vibration and damage to the components of the unit in severe cases. In this paper, a three-dimensional full flow numerical model including the runner gap and the pressure-balance pipe was established. The method SST k-ω model was used to predict the internal flow characteristics of the pump turbine. The pressure pulsation of the runner under different operating conditions during the no-load process was compared. Because the rotation speed, flow rate, and guide vane opening of the unit change in a small range during the no-load process, the pressure pulsation characteristics of the runner are basically the same. Therefore, a working condition was selected to analyze the transient characteristics of the flow field, and it was found that there was a high-speed ring in the vaneless zone, and a stable channel vortex was generated in the runner flow passage. Analyzing the axial water thrust of each part of the runner, it was found that the axial water thrust of the runner gap was much larger than the axial water thrust of the runner blades, and it changed with time periodically. It was affected by rotor stator interaction. The main frequency was expressed as a multiple of the number of guide vanes, that is, vanes passing frequency, 22fn. During the entire no-load process, the axial water thrust of the runner changed slowly with time and fluctuated slightly.

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