Experimenting Mechanism and Material Optimization of Fe-Ni Foam Metal about Suppressing Gas Explosion and Propagation

2014 ◽  
Vol 953-954 ◽  
pp. 1633-1637
Author(s):  
Jin Peng Zhang ◽  
Chun Rong Wei ◽  
Jian Hua Sun ◽  
Jun Li ◽  
Hai Bo Sun
Keyword(s):  
Shock Wave ◽  
Flame Temperature ◽  
Three Dimensional ◽  
Engineering Application ◽  
Gas Explosion ◽  
Ni Foam ◽  
Material Optimization ◽  
Foam Metal ◽  
Metal Materials ◽  
Explosion Experiment

Using self-designed 30cm×30cm gas explosion experiment pipe and data acquisition system, we found Fe-Ni foam metal suppresses better gas explosion. We analyzed mechanism of suppressing gas explosion from material characteristics,. The three-dimensional holing-through structure of foam metal can quench exploding flame and decline exploding shock wave. Foam metal material has dual advantages of material and structure which can suppress transmission of fire and shock wave. Effect on different parameters of Fe-Ni foam metal materials was contrasted from declining overpressure and flame temperature, and suitable Fe-Ni form metal was optimized for engineering application.

Numerical Modelling of Gas Explosion Overpressure Mitigation Effects

2020 ◽  
Vol 1006 ◽  
pp. 117-122
Author(s):  
Yurii Skob ◽  
Mykhaylo Ugryumov ◽  
Yuriy Dreval
Keyword(s):  
Mathematical Model ◽  
Shock Wave ◽  
Computer Technology ◽  
Solid Wall ◽  
Three Dimensional ◽  
Probit Analysis ◽  
Gas Explosion ◽  
Compression Phase ◽  
Damage Probability ◽  
Fueling Station

The main aims of this study are to assess numerically the mitigation effects caused by the solid wall installed at the fueling station in order to protect personnel from the consequences of the emergent gas explosion, evaluate the optimal location of the wall and choose the appropriate material the wall have to be made of in order not to be destructed. A three-dimensional mathematical model of an explosion of hydrogen-air cloud is used. A computer technology how to define the personnel damage probability fields on the basis of probit analysis of the explosion wave is developed. The mathematical model takes into account the complex terrain and three-dimensional non-stationary nature of the shock wave propagation process. The model allows obtaining time-spatial distribution of damaging factors (overpressure in the shock wave front and the compression phase impulse) required to determine the three-dimensional non-stationary damage probability fields based on probit analysis. The developed computer technology allows to carry out an automated analysis of the safety situation at the fueling station and to conduct a comparative analysis of the effectiveness of different types of material the protective facilities made of.

scholarly journals The research into the propagation law of the shock wave of a gas explosion inside a building

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Shu-Chao Lin ◽  
You-Chun Xu ◽  
Pei-Dong Yang ◽  
Shan Gao ◽  
Yi-Jun Zhou ◽  
...  
Keyword(s):  
Shock Wave ◽  
Peak Pressure ◽  
Initial Conditions ◽  
Three Dimensional ◽  
Time History ◽  
Element Model ◽  
Space Distribution ◽  
Gas Explosion ◽  
Propagation Law ◽  
Three Dimensional Finite Element

Based on the dissipation rate conservation equations of turbulent kinetic energy in the k-ε turbulence model, a complicated three-dimensional finite element model of a kitchen filled with gas mixture is developed by using the open source field operation and manipulation (OpenFOAM). Two representative kitchens were used to investigate the propagation law of the shock wave of a gas explosion inside a building by considering the key characteristics of the blast shock wave. The influence of some crucial parameters, such as initial conditions and kitchen parameters, on the properties of the blast shock wave is investigated. The basic steps to predict the peak pressure of the blast shock wave are given in consideration of the initial condition and the kitchen whilst the injury effect of the blast shock wave on the humans and animals is evaluated. The research results indicate that the pressure time history and the peak pressure space distribution are greatly influenced by the kitchen design layout. The coupled interaction between the initial temperature and gas volume concentration, especially at the upper and lower explosion limits of the gas, significantly affects the peak pressure. The peak pressure varies significantly with the opening and the buffer; however, it has little relation with the width, length, and height of the kitchen. The proposed method can accurately and effectively predict the peak pressure of the blast shock wave inside buildings. In terms of the peak pressure space distribution of the explosion shock wave, the peak pressure is much higher than the threshold of the killing pressure, which is unsafe for the humans and animals in the building.

scholarly journals Numerical Simulation of Impact Loads of Main Fan Blades in Gas Explosion

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jianliang Gao ◽  
Jingzhang Ren ◽  
Xuebo Zhang ◽  
Jiajia Liu ◽  
Chunxia Wang
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Radial Direction ◽  
Three Dimensional ◽  
Time Interval ◽  
Impact Loads ◽  
Gas Explosion ◽  
Occurrence Time ◽  
Fan Blade ◽  
The Relationship

The shock wave generated by a severe gas explosion accident can damage the main fan, and the toxic and harmful gases in the well cannot be discharged in time, leading to the expansion of disaster accidents. Therefore, it is meaningful to study impact loads of main fan blades in gas explosion. In this paper, a full-scale three-dimensional numerical simulation model has been established based on No. 2 Yangchangwan Coal Mine in China. The propagation of shock wave in shaft and air tunnel and the dynamic process of main fan blade subjected to shock load when gas explosion of different volume occurs in heading face have been simulated. The overpressure on the blade at different times, the overpressure distribution on the blade, and the relationship between the overpressure and the explosion intensity have been obtained. The results showed that the time when the explosion shock wave reached, each blade of the wind turbine was basically the same, and the time when each blade reached, the maximum overpressure was basically the same. With the increase of gas explosion volume, occurrence time of overpressure and maximum overpressure time on the fan blade were shortened, and the time interval between them was also shortened. There is a little difference in the overpressure of each blade. Fan blade directly above the hub was subject to the highest overpressure, and fan blade directly below the hub was subject to the lowest overpressure. The overpressure of the maximum overpressure blade was 5.44% to 6.77% higher than that of the minimum overpressure blade. The distribution of overpressure on each fan blade was uneven, and the overpressures on blade edges were the lowest. The overpressure on the fan blades showed a corrugated distribution along the radial direction. There was 12.06% to 15.40% difference between the maximum and minimum overpressure section on the fan blade.

Unsteady Three-Dimensional Analysis of Inlet Distortion in a Transonic Fan

2006 ◽  
Author(s):  
Peng Sun ◽  
Guotal Feng
Keyword(s):  
Shock Wave ◽  
Total Pressure ◽  
Large Scale ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Inlet Distortion ◽  
Flow Loss ◽  
Large Scale Vortex ◽  
Total Temperature ◽  
Transonic Fan

A time-accurate three-dimensional Navier-Stokes solver of the unsteady flow field in a transonic fan was carried out using "Fluent-parallel" in a parallel supercomputer. The numerical simulation focused on a transonic fan with inlet square wave total pressure distortion and the analysis of result consisted of three aspects. The first was about inlet parameters redistribution and outlet total temperature distortion induced by inlet total pressure distortion. The pattern and causation of flow loss caused by pressure distortion in rotor were analyzed secondly. It was found that the influence of distortion was different at different radial positions. In hub area, transportation-loss and mixing-loss were the main loss patterns. Distortion not only complicated them but enhanced them. Especially in stator, inlet total pressure distortion induced large-scale vortex, which produced backflow and increased the loss. While in casing area, distortion changed the format of shock wave and increased the shock loss. Finally, the format of shock wave and the hysteresis of rotor to distortion were analyzed in detail.

Numerical Study on the Effect of Inner Tube Position on Heat Transfer Process in Self-Recuperative Radiant Tube

2011 ◽  
Vol 228-229 ◽  
pp. 676-680 ◽  
Author(s):  
Ye Tian ◽  
Xun Liang Liu ◽  
Zhi Wen
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Numerical Study ◽  
Flame Temperature ◽  
Three Dimensional ◽  
Mathematic Model ◽  
Heat Transfer Process ◽  
Bulk Temperature ◽  
Radiant Tube ◽  
Peak Value

A three-dimensional mathematic model is developed for a 100kw single-end recuperative radiant tube and the simulation is performed with the CFD software FLUENT. Also it is used to investigate the effect of distance between combustion chamber exit and inner tube on heat transfer process. The results suggest that the peak value of combustion flame temperature drops along with the increasing of distance, which leads to low NOX discharging. Also radiant tube surface bulk temperature decreases, which causes radiant tube heating performance losses.

Simulation on Torpedo Unsteady Hydrodynamic with the Movement in the Longitudinal Plane

2013 ◽  
Vol 791-793 ◽  
pp. 1073-1076
Author(s):  
Ming Yang ◽  
Shi Ping Zhao ◽  
Han Ping Wang ◽  
Lin Peng Wang ◽  
Shao Zhu Wang
Keyword(s):  
Three Dimensional ◽  
Engineering Application ◽  
Calculation Model ◽  
Trajectory Design ◽  
Design Calculation ◽  
Variable Speed ◽  
Accurate Calculation ◽  
Longitudinal Plane ◽  
Submerged Body ◽  
Mesh Method

The unsteady hydrodynamic accurate calculation is the premise of submerged body trajectory design and maneuverability design. Calculation model of submerged body unsteady hydrodynamic with the movement in the longitudinal plane was established, which based on unsteady three-dimensional incompressible fluid dynamics theory. Variable speed translational and variable angular velocity of the pitching motion in the longitudinal plane of submerged body was achieved by dynamic mesh method. The unsteady hydrodynamic could be obtained by model under the premise of good quality grid by the results. Modeling methods can learn from other similar problems, which has engineering application value.

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