The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

Combined with the k-ε turbulence model of general application, a refined finite element model of a utility tunnel’s gas compartment filled with the methane/air mixture is developed. A series of analyses are made by using the powerful industry-leading computational fluid dynamics (CFD) software flame acceleration simulator (FLACS) to study the shock wave propagation rule in the gas compartment. The longitudinal and transversal distribution laws of the explosion shock wave are gained taking into consideration the spatial characteristics of the gas compartment. The influences of a few parameters, such as initial conditions and section size of the gas compartment, on the shock wave propagation rule are further discussed. The basic procedure for predicting the peak pressure of the blast wave is provided by considering the initial conditions and the gas compartment, and the corresponding injury effect of the explosion wave on the living beings is assessed. The investigation demonstrates that the peak pressure by the coupled effect between the initial conditions is significantly influenced, especially at the upper and lower gas explosion limits. The peak pressure increases gradually as the width or height increases, and both basically meet the linear relation. The proposed method can forecast the peak pressure of the explosion shock wave in the gas compartment accurately. According to the peak pressure longitudinal and transversal distributions of the blast wave, the peak pressure is far greater than the killing pressure threshold in the underground and closed space; consequently, it is not safe for the living beings in the gas compartment.

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

Shock and Vibration ◽

10.1155/2021/4939014 ◽

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.

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Numerical Analysis of Shock Wave Propagation Law of Internal Gas Explosion

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.105-107.299 ◽

2011 ◽

Vol 105-107 ◽

pp. 299-302

Author(s):

Xiu Hua Zhang ◽

Yan Yan Wu

Keyword(s):

Shock Wave ◽

Wave Propagation ◽

Initial Energy ◽

Shock Wave Propagation ◽

Coupling Method ◽

Frame Structure ◽

Gas Explosion ◽

Fluid Structure ◽

Explosion Pressure ◽

Propagation Law

The purpose of this paper is to research on shock wave propagation law of internal gas explosion. The multi-material Eulerian and Lagrangian coupling algorithm was adopt. Using ANSYS/LS-DYNA dynamic analysis software to build frame structure, air and gas explosion models. Multiple ALE elements for simulating air and gas explosion material the analysis of blast shock wave propagation in a three-story steel frame structure and the characteristics of explosion pressure using fluid-structure coupling method are carried out. The conclusions show that fluid-structure coupling method can well simulated shock wave propagation of internal gas explosion, and the pressure peak of blast shock wave increased with the increasing of the blast air initial energy. Locality is the characteristic of explosion pressure in sealed space, and the pressure pass weakly when it propagates in solid.

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Study on Influence Scope of Shock Wave and Smoke Flow after Gas Explosion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.136.48 ◽

2010 ◽

Vol 136 ◽

pp. 48-52

Author(s):

Zhi Ming Qu

Keyword(s):

Shock Wave ◽

Wave Propagation ◽

Wave Energy ◽

Shock Wave Propagation ◽

Gas Explosion ◽

Smoke Flow ◽

Shock Wave Energy ◽

The World ◽

Through Diffusion

Gas explosion is very disastrous accident all over the world. Influence scope analysis of shock wave and smoke after gas explosion is of great importance and significance. The results indicate that, during the process of shock wave propagation destroying the air throttle, the shock wave energy will be consumed as part of air throttle destruction, which causes the overpressure reduced. However, the shock wave continues to be propagated and attenuated to a certain distance. Results on analyzing influence scope of smoke flow show that the smoke temperature and concentration in roadway are higher before restoring ventilation. The smoke is diluted by the fresh air through diffusion. After restoring ventilation, the temperature and concentration of smoke flow are lowered greatly. In conclusion, the influence scope study of shock and smoke flow is of full practice.

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The Similarity Law of Internal-Blast Wave Propagation in the Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1065-1069.1143 ◽

2014 ◽

Vol 1065-1069 ◽

pp. 1143-1146

Author(s):

Xiao Qiu ◽

Jue Ding ◽

Zhong Jie Wang ◽

Pei Feng Weng

Keyword(s):

Shock Wave ◽

Wave Propagation ◽

Peak Pressure ◽

Maximum Velocity ◽

Shock Wave Propagation ◽

Damage Effect ◽

Positive Pressure ◽

Scaled Distance ◽

Propagation Law ◽

Similarity Law

Concrete mechanical properties under dynamic load such as blast and impact are very complex. Shock wave propagation law and damage effect in the concrete were studied numerically in the paper by using TNT explosive ignition and growth model, concrete dynamic damage model, and SPH method. And shock wave properties of different mass explosives in the concrete were analyzed with the similarity theory. The result shows that TNT shock wave propagation law meets the internal-blast similarity law. Peak pressure, positive pressure impulse, maximum velocity and maximum acceleration in the concrete decrease with the increase of scaled distance. And time needed for reaching peak pressure increases linearly with the increase of scaled distance. A theoretical basis of structure and protection design for constructions is achieved in the paper.

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