Numerical Simulation and Experimental Research on a Splash-Proof Water Injector

2011 ◽  
Vol 291-294 ◽  
pp. 2866-2870
Author(s):  
Zhong Yi Wang ◽  
Jia Han ◽  
Xu Yang ◽  
Tao Sun
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
Domain Model ◽  
Calculation Methods ◽  
Two Phase ◽  
Simulation Research ◽  
Vof Model ◽  
Velocity Flow ◽  
Simulation Results ◽  
Experimental Researches

In this thesis, a model of water injector is established, which can prevent water from splashing when high-velocity flow pours into a container. With the periodic boundary, the 1/18 calculation domain model is built. Then two-phase flow numerical simulation research is done on the device with the steady VOF model. The influencing factors of water injector's performance and the variation laws under different working conditions are obtained. The reliability of the results is improved by comparing the results from different calculation methods with that from steady-state VOF method. And through the experimental researches on the splash-proof water injector, the accuracy of the numerical simulation results is validated.

Simulation Research of Interior Ballistics Performance for a New-Type Light Caliber Cannon

2013 ◽  
Vol 446-447 ◽  
pp. 458-462
Author(s):  
Jia Ning Li ◽  
Xin Liao ◽  
Feng Qiang Nan
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Phase Flow ◽  
Gas Temperature ◽  
Projectile Velocity ◽  
Two Phase ◽  
Simulation Research ◽  
Interior Ballistics ◽  
New Type ◽  
Simulation Results

In order to make a precise interpret and research of interior ballistics performance for a new-type light caliber cannon, an interior ballistics mathematical and physical model was established, on the basis of two-phase flow interior ballistics theory and description of interior ballistic cycle. MATLAB software was used to conduct numerical simulation. Conclusion indicates that the simulation results manifest favorable consistency with the experiment results. Simulation results can comprehensively interpret the physical process in guns by pressure distribution, projectile velocity and gas temperature distribution.

scholarly journals Prefabricated Urban Underground Utility Tunnels: A Case Study on Mechanical Behaviour with Strain Monitoring and Numerical Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yonggang Xiao ◽  
Jubing Zhang ◽  
Jie Cao ◽  
Changhong Li
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Low Cost ◽  
Side Wall ◽  
Operating Conditions ◽  
Land Occupation ◽  
Depth Analysis ◽  
Simulation Results

The prefabricated urban utility tunnels (UUTs) have many advantages such as short construction period, low cost, high quality, and small land occupation. However, there is still a lack of in-depth analysis of the mechanical performance of the prefabricated urban utility tunnel (UUT) structure with bolted connections under different working conditions. In this paper, the force performance of a prefabricated UUT in Tongzhou District, Beijing, was studied under different working conditions using two methods: field monitoring and numerical simulation. The multichannel strain monitor was used for monitoring, and the internal wall concrete and bolt strain change data under the two conditions of installation and backfill were obtained. Combined with the construction process of the UUTs, a three-dimensional numerical model was established by COMSOL, where the build-in bolt assembly was used to simulate the longitudinal connection of the tunnel. The simulation results were compared with the measured data to verify the rationality of the computational model. The simulation results showed that the concrete and bolts on the inner wall of the tunnel work well under the two conditions of installation and backfilling; The deformation of the top plate of the prefabricated tunnel was approximately parabolic, with the largest vertical displacement (0.37 mm) in the middle and the most sensitive to the vertical load in the central part of the roof. The central portion of the side wall had the largest displacement (0.17 mm) in the inner concave. The tensile stress of bolt 3 increased the most (30.75 MPa) but was still much smaller than the yield strength of the bolt. The concrete and bolts of the UUT were found to work well through force analysis under operating conditions. In conclusion, analysis of structural forces and deformation failure modes will help design engineers understand the basic mechanisms and select the appropriate UUT structure.

Study on flow field of gas–solid two-phase pulsed jet

2019 ◽  
Vol 33 (24) ◽  
pp. 1950279
Author(s):  
Xinhua Song ◽  
Xiaojie Li ◽  
Yang Wang ◽  
Honghao Yan
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Particle Distribution ◽  
Starch Granule ◽  
Injection Pressure ◽  
Two Phase ◽  
Particle Injection ◽  
Pulsed Jet ◽  
Simulation Based ◽  
Simulation Results

In this paper, a computational fluid dynamics–discrete element method (CFD–DEM) coupling method is established to simulate the starch granule injection by coupling CFD and DEM. Then a gas–solid two-phase pulsed jet system is designed to capture the flow field trajectory of particle injection (colored starch with a mean diameter of 10.67 [Formula: see text]m), and the image is processed by color moment and histogram. Finally, the simulation results are compared with the experimental results, and the following conclusions are drawn. The numerical simulation results show that with the increase of injection pressure, the injection height increases gradually. When the injection pressure reaches above 0.4 MPa, the increase of injection height decreases. The experimental images show that the larger the pressure (i.e., the greater the initial velocity), the faster the velocity of particle distribution in the space, and the injection heights with the injection pressures of 0.4 MPa and 0.5 MPa are close, which is consistent with the result from the FLUENT numerical simulation based on CFD–DEM.

scholarly journals Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Fei Yao ◽  
Guangyu Chen ◽  
Jianhong Su
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Working Conditions ◽  
Acoustic Impedance ◽  
Shield Tunnel ◽  
Test Results ◽  
Impact Echo ◽  
Simulation Results ◽  
The Impact ◽  
Impact Echo Method

To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was carried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element numerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results demonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical values. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could not be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was more complicated than that under no grouting defects.

Numerical Simulation on Hydraulic Characteristics of Underflow for Falling-Sill Bottom-Flow Dissipation

2013 ◽  
Vol 864-867 ◽  
pp. 2027-2030
Author(s):  
Shan Shan Lu ◽  
Hua Li ◽  
Hui Chao Dai ◽  
Quan Lin Ding
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Scientific Basis ◽  
Flow Speed ◽  
Turbulent Motion ◽  
Hydraulic Characteristics ◽  
Two Phase ◽  
Plunge Pool ◽  
Vof Model ◽  
Flow Vortex

Falling-sill bottom-flow dissipation is an important energy dissipater way, which has two fluent characteristics, spatial 3D hydraulic jump and submerge jet. But the turbulent motion is strong with a flow pattern of complex level. It is hard to detail the hydraulic characteristics and strength being inside of the plunge pool using physical experiments. However, numerical simulation can match the deficiency of physical model, which has the access to detail flow field hydraulic characteristics and provide a strong scientific basis on analyzing the hydrodynamic and hydraulic characteristics of plunge pool. In this paper, XJB project is taken for example, gas-liquid two-phase flow tracking the simulation free surface of VOF model was used. The RNG κ_ε turbulent motion model is adequate to simulate the 3D flow field in plunge pool. The result shows that the consequence of numerical simulation and physic test match well, which can reflect the plunge pool hydraulic characteristics and dissipation process accurately. The distribution of flow speed inside the plunge pool locates the position of main flow and reflects the velocity decay along the way and reflux flow vortex .

Numerical Simulation of the Nozzle with Self-Oscillating Flow Using the VOF Model

2012 ◽  
Vol 479-481 ◽  
pp. 2380-2382
Author(s):  
Zheng Fu Zhang ◽  
Jun Wei Wang ◽  
Feng Bao
Keyword(s):  
Numerical Simulation ◽  
Cfd Simulation ◽  
Immiscible Fluids ◽  
Oscillating Flow ◽  
Surface Tracking ◽  
Shape Models ◽  
Vof Model ◽  
Eulerian Mesh ◽  
Simulation Results ◽  
Fixed Period

The jet water shape of the nozzle will become a self-oscillating shape, if the triangle and U shape models are made into the normal nozzle. Using the VOF model , the jet shape of the nozzle will be simulated through a commercial CFD software 'FLUENT'. The VOF model (Volume of Fluid) is a surface-tracking technique applied to a fixed Eulerian mesh. It is designed for two or more immiscible fluids where the position of the interface between the fluids is of interest. The CFD simulation results shows that the jet shape of the nozzle is oscillate in a fixed period.

Simulation Research on Hydraulic Support Column System Based on AMESim

2012 ◽  
Vol 229-231 ◽  
pp. 1684-1687
Author(s):  
Jun Zhu ◽  
Feng Yuan ◽  
Hong Xia Wu
Keyword(s):  
Simulation Model ◽  
Working Conditions ◽  
Hydraulic System ◽  
Hydraulic Support ◽  
Simulation Research ◽  
Column System ◽  
Actual Working ◽  
Working Principle ◽  
Simulation Results ◽  
Working Procedure

The working principle and process of the hydraulic support column system is introduced at first. The simulation model of the column system is established in the software of AMESim, and the parameters of the model are set according to the actual working conditions. The simulation curves of each working procedure are obtained, and the simulation results are analyzed. The conclusions will be essential references for the research on the entire support hydraulic system.

The Numerical Simulation of Aerated Cavity Length and Negative Pressure on Stepped Spillway Combined with Y-Shape Asymmetrical Flaring Gate Pier

2013 ◽  
Vol 864-867 ◽  
pp. 2185-2192
Author(s):  
Xiao Xia Hou ◽  
Ju Rui Yang ◽  
Jian Shu Zhen
Keyword(s):  
Negative Pressure ◽  
Cavity Length ◽  
Lateral Side ◽  
Stepped Spillway ◽  
Body Type ◽  
Two Phase ◽  
Vof Model ◽  
Contraction Ratio ◽  
Simulation Results ◽  
Contraction Angle

In order to study the aerated cavity length and negative pressure on stepped spillway which combined with Y-shape asymmetric flaring gate pier body type, this paper applied RNG turbulence model,VOF model of water vapor two-phase, iterative solution of geometry reconstruction format of unsteady flow to generate free surface. Numerically simulated the length of aerated cavity and negative pressure of stepped spillway which combined with asymmetrical Y-shape flaring gate pier that with the contraction ratio respectively of 598, 0.497 and 0.445, the range from the upstream reservoir to downstream stilling basin. And compared the simulation results with experimental results, found that the aerated cavity length on steps basically consistent with the measured cavity length, the maximum error is 9.7%. The simulation results shows that the aeration cavity length on steps increases with asymmetric flaring gate pier contraction ratio decreases, and the aerated cavity length of lateral side with smaller contraction angle is larger 4 to 5 times than lateral side with larger contraction angle.

scholarly journals Numerical Simulation Research on Gas-Solid Two Phase Flow in Oil Shale Circulating Fluidized Bed

2012 ◽  
Vol 17 ◽  
pp. 851-860 ◽  
Author(s):  
Qing Wang ◽  
Jun-tao Feng ◽  
Bai-zhong Sun ◽  
Yong-qing Qi ◽  
Deng-feng Chen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fluidized Bed ◽  
Oil Shale ◽  
Two Phase Flow ◽  
Circulating Fluidized Bed ◽  
Phase Flow ◽  
Two Phase ◽  
Simulation Research
Sign in / Sign up

Export Citation Format

Share Document