Theoretical and numerical studies on the scale effects for strong explosion fireball thermal radiation characteristics

LI Kang; LIU Na; LI Shouxian; ZHAO Duo

doi:10.11883/bzycj-2023-0199

Volume 44 Issue 10

Oct. 2024

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Article Navigation > Explosion And Shock Waves > 2024 > 44(10): 102101

YANG Shigang, CAI Jiongwei, YANG Ya, SUN Wensheng, MEN Jingmin. Disaster effects of combustible gas explosion in an urban shallow-buried pipe trench (Ⅰ): shock wave propagation on the ground[J]. Explosion And Shock Waves, 2022, 42(10): 105101. doi: 10.11883/bzycj-2021-0502

Citation:

LI Kang, LIU Na, LI Shouxian, ZHAO Duo. Theoretical and numerical studies on the scale effects for strong explosion fireball thermal radiation characteristics[J]. Explosion And Shock Waves, 2024, 44(10): 102101. doi: 10.11883/bzycj-2023-0199

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Theoretical and numerical studies on the scale effects for strong explosion fireball thermal radiation characteristics

doi: 10.11883/bzycj-2023-0199

LI Kang^{1, 2
,},
LIU Na^{1, 2
,
,},
LI Shouxian²,
ZHAO Duo²

1.
Software Center for High Performance Numerical Simulation, China Academy of Engineering Physics, Beijing 100088, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received Date: 2023-05-26
Rev Recd Date: 2024-06-17

Available Online: 2024-06-17

Publish Date: 2024-10-30

Abstract

Abstract

As a typical characteristic of fireball phenomena, thermal radiation plays an important role in damage assessments. Up to now, many studies of thermal radiation using theoretical, numerical, and experimental methods have been carried out and empirical formulas in forms of yield or density are constructed to feature the extremal characteristic of fireball thermal radiation. However, due to the combined action of radiation free path (RFP) and fireball characteristic length (FCL), it is difficult to identify these formula’s application scope, and further theoretical studies are needed to take the scale effect (SE) into account. By radiation heat conduction approximation model under optical thickness assumption, scale effect similarity parameter (SESP) was theoretically derived and its scope of application is further verified by high-precision numerical method. The numerical code is developed within a framework of Euler method, and adaptive mesh refinement method is employed to improve the precision in the radiation front. The results of theoretical analysis show that SESP is consistent with existed conclusions regarding the thermal radiation of fireball at different altitudes, and it can be applied to the analysis of laboratory scale fireball. Meanwhile, numerical results also show that both scale effects at different altitudes and laboratory scale can be characterized by SESP.
- strong explosion fireball,
- radiation hydrodynamics,
- thermal radiation,
- scale effect,
- laboratory scale

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References

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