Effect of Room Layout on Natural Gas Explosion in Kitchen
Abstract
:1. Introduction
2. Numerical Method
2.1. Numerical Model
2.2. Verification of Grid Independence
2.3. Verification of Computational Domain
2.4. Experimental Validation of the Model
3. Research Methods
4. Results and Discussion
4.1. Effects of Gas Concentration on Congestion Explosion
4.1.1. Distribution Characteristics of Indoor Flow Field
4.1.2. Characteristics of Indoor Flame Propagation
4.1.3. Characteristics of Indoor Overpressure Distribution
4.2. Effects of Room Layout on Congestion and Explosion
4.2.1. Distribution Characteristics of Indoor Flow Field
4.2.2. Characteristics of Indoor Flame Propagation
4.2.3. Characteristics of Indoor Overpressure Distribution
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Nomenclature | |
---|---|
C | Sound velocity in cell grid |
C1, C2 | Constant |
Ct | Flame speed constant |
Cμ | Model constants (m2/s) |
CV | Constant-volume specific heat (j/kg/K) |
E | Energy (J) |
Fs | Laminar flame acceleration coefficient |
Hc | Heat of combustion (kJ/mol) |
i, j | Coordinate direction |
K | Turbulent kinetic energy (m2/s2) |
Lt | Characteristic length of the turbulence (m) |
mfu | Fuel mass fraction |
p | Static pressure (Pa) |
Rf | Spherical flame radius (m) |
Rfu | Volumetric combustion rate (kg/m3) |
Rmin | Minimum value of fuel mass fraction, oxygen mass fraction, and product mass fraction |
Sl | Specific laminar combustion velocity (m/s) |
St | Turbulent burning velocity (m/s) |
t | Time coordinate |
T | Temperature (K) |
u | Velocity (m/s) |
ut | Turbulence intensity |
v | Kinematic viscosity of unburned mixture (m2/s) |
V | Velocity vector |
x | Space coordinates |
Δt | Maximum allowed time increment |
Δx | Maximum allowed time increment |
ρ | Density (kg/m3) |
Γ* | Turbulent diffusion coefficient (m2/s) |
(σ)* | Turbulent Prandtl constant |
τij | Viscous stress tensor |
μt | Turbulence viscosity coefficient |
ε | Turbulent kinetic energy dissipation rate (m2/s3) |
δij | Kronecker symbol |
ω | Time step safety factor |
Distance to the Back Wall/m | PM1/kPa | PM2/kPa | Absolute Discrepancy/% | Relative Discrepancy/% |
---|---|---|---|---|
0.5 | 21.52 | 23.33 | 1.81 | 7.8 |
0.9 | 21.32 | 23.32 | 2.00 | 8.6 |
1.3 | 21.04 | 23.30 | 2.26 | 9.7 |
1.7 | 20.78 | 22.94 | 2.16 | 9.4 |
3.3 | 20.00 | 20.01 | 0.01 | 0 |
4.1 | 8.48 | 8.77 | 0.29 | 3.3 |
7.7 | 7.83 | 8.15 | 0.32 | 3.9 |
Distance to the Back Wall/m | 20.4 m × 2.1 m × 2.4 m | 20.4 m × 3 m × 4 m | Absolute Discrepancy/% | Relative Discrepancy/% |
---|---|---|---|---|
0.5 | 21.52 | 22.73 | 1.21 | 5.3 |
0.9 | 21.32 | 21.94 | 0.62 | 2.8 |
1.3 | 21.04 | 21.88 | 0.84 | 3.8 |
1.7 | 20.78 | 21.74 | 0.96 | 4.4 |
3.3 | 20.00 | 21.01 | 1.01 | 4.8 |
4.1 | 8.48 | 8.69 | 0.21 | 2.4 |
7.7 | 7.83 | 8.07 | 0.24 | 3.0 |
Parameter | Experiment | Simulation | Absolute Discrepancy/% | Relative Discrepancy/% |
---|---|---|---|---|
Peak overpressure (kPa) | 18.60 | 18.48 | 0.12 | 0.65 |
Peak overpressure Incidence time (ms) | 407 | 420 | 13 | 3.10 |
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Yang, K.; Wu, H.; Chen, Y. Effect of Room Layout on Natural Gas Explosion in Kitchen. Fire 2024, 7, 235. https://doi.org/10.3390/fire7070235
Yang K, Wu H, Chen Y. Effect of Room Layout on Natural Gas Explosion in Kitchen. Fire. 2024; 7(7):235. https://doi.org/10.3390/fire7070235
Chicago/Turabian StyleYang, Kai, Hao Wu, and Ye Chen. 2024. "Effect of Room Layout on Natural Gas Explosion in Kitchen" Fire 7, no. 7: 235. https://doi.org/10.3390/fire7070235