Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

Li, Zexu; Wu, Jiansong; Li, Mingyu; Li, Yuntao; Ma, Qiuju

doi:10.3390/su12010153

Cited by 25 publications

(14 citation statements)

References 39 publications

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“…The SIMPLE (Semi-Implicit Method for Pressure Linked Equations) pressure correction algorithm is applied and extended to the additional source term of the compression work for the enthalpy equation of compressible flow. Furthermore, the special flame acceleration solver is used to solve the explosion shock wave, which can account for the interaction and influence of the flame with the gas pipeline, fire extinguisher boxes, distribution box, etc., and can compute the gas explosion shock wave directly [28].…”

Section: Methodsmentioning

confidence: 99%

Numerical studies on an accidental flashfire at a water fun park by FLACS software

Chen

et al. 2022

THERM SCI

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A severe accidental fire with ?explosion? resulting from spraying coloured corn flour powder occurred at a water fun park in Taiwan. The possible fire scenarios were studied in this paper using Flame Acceleration Simulator(FLACS). Environmental conditions including wind action and solid boundary conditions were deduced based on government fire investigation and video records, and were used as the input parameters in simulation. Simulation results indicate that upon ignition of the sprayed powder, the maximum overpressure in the open space was only 0.03 bar gauge, with a dust flash fire generated without having an explosion. These environmental conditions or parameters and the simulation results together would give a fire scene that agrees with the accident observed, indicating that appropriate environmental parameters had been identified. Therefore, CFD simulation with carefully selected parameters can be used to reproduce explosion scenarios and to identify key factors in supporting accident investigations.

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Section: Methodsmentioning

confidence: 99%

Numerical studies on an accidental flashfire at a water fun park by FLACS software

Chen

et al. 2022

THERM SCI

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“…Wang et al 37 used CFD to simulate the hazards of a natural gas leak and explosion of the East Harlem gas explosion in Manhattan, New York, and the simulation results are consistent with the actual accident results. Li et al 38 used FLACS to simulate the characteristics of gas explosion in a natural gas compartment of the urban utility tunnel. Song et al 39 studied the consequences of gas explosion accidents in residential buildings, and the effects of vent area ratio and broken pressure of glasses were investigated to propose the effective risk reduction measures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Cai

Liu

et al. 2022

ACS Omega

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Frequent occurrence of indoor natural gas explosion accidents seriously threatens the safety of people and property. To determine the law of indoor natural gas leakage and explosion hazards, based on experiment and simulation, the nature of natural gas explosion, the distribution law of natural gas volume fraction, flame propagation, temperature, and shock wave overpressure were studied. The results show that the flame structure can be divided into three zones, i.e., preheat zone, reaction zone, and product zone. OH + CO ⇔ H + CO 2 is the main exothermic reaction in the combustion process. The overall distribution law of natural gas volume fraction shows that the higher the position, the greater the volume fraction, and the closer the distance to the leak source at the same height, the greater the volume fraction, and the natural gas volume fraction of the hose falling off is the largest under different leakage conditions. The difference in the wrapping structure of the kitchen package has a significant impact on the diffusion distribution of natural gas. The flame development goes through five stages of ignition, slow burning, detonation, slow burning, and extinguishing. The indoor temperature reaches about 1400 °C. Although the simulated value of shock wave overpressure is larger than the experimental value, the relationship between overpressure and distance is expressed by Y = A + B * ln( X + C ). This study can provide certain technical support for natural gas accident rescue. The research can provide certain technical support for natural gas accident rescue and can also be used for accident investigation to form the determination procedure and method of leakage location and leakage amount.

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“…1 The utility tunnel is a central location of pipelines for utilities such as gas and water supplies, cable, communications, and drainage in a city. 2 Compared with the traditional direct-buried laying method for pipelines, utility tunnels can provide enough working space for staff and can also be equipped with sensors and monitoring equipment, which greatly facilitates the maintenance and repair of various internal municipal services. 1,3 At present, most utility tunnel projects in China are constructed by the integral cast-in-place method.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on seismic response of split‐type prefabricated utility tunnels through shaking table tests

Luo

Zhou

2022

Earthq Engng Struct Dyn

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Due to the advantages of prefabricated structure, its applications in utility tunnels are increasing. However, more connection joints have raised concerns about the vulnerability of prefabricated utility tunnels in earthquake disasters. The main objectives of this research are to analyze the seismic response, vulnerable parts and failure modes of a prefabricated utility tunnel. A pair of twin models of prefabricated utility tunnels with two‐compartment layouts were designed, and then set up to load ground motions synchronously through a large‐scale shaking table of 6 m × 6 m under two different boundary conditions: one buried inside a soil box and its twin laid outside the soil as a comparison. The results show that: the damage of the split‐type prefabricated utility tunnel is mainly concentrated in the connection joints, and the connection joint at the top corner of the compartment with larger cross section is the vulnerable part that needs special attention; the SSI effect has a great influence on the seismic response of the prefabricated utility tunnel, and the model buried inside the soil box shows stronger seismic response than its twin laid outside the soil. The experimental results and analysis in this paper can provide a helpful reference for risk assessment and prevention, seismic design, and structural optimization of prefabricated utility tunnels.

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Numerical Analysis of the Characteristics of Gas Explosion Process in Natural Gas Compartment of Utility Tunnel Using FLACS

Cited by 25 publications

References 39 publications

Numerical studies on an accidental flashfire at a water fun park by FLACS software

Numerical studies on an accidental flashfire at a water fun park by FLACS software

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Experimental research on seismic response of split‐type prefabricated utility tunnels through shaking table tests

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