Studies on formation of unconfined detonable vapor cloud using explosive means

Apparao, A.; Rao, C. Raghavendra; Tewari, Surya P.

doi:10.1016/j.jhazmat.2013.02.056

Cited by 21 publications

(12 citation statements)

References 6 publications

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“…TNT was selected as high explosive in the central charge because of the low-detonation velocity and low pressure blasting compared to RDX and HMX. Moreover, TNT was chosen as the initiator charge for cloud detonation test [17].…”

Section: Methodsmentioning

confidence: 99%

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Influences of the Cloud Shape of Fuel-Air Mixtures on the Overpressure Field

Bai

Wang

et al. 2016

Shock and Vibration

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This paper presents an experiment system in the open field, which comprises a charge structure (approximately 166.2 kg), a high-speed camera subsystem, and a pressure measurement subsystem. Through a series of experiments under the cylindrical clouds with different diameters, heights, and diameter-to-height ratios (D : H), the influences of various cloud shapes on the overpressure field were analyzed and discussed. Based on the experimental results, the overpressure field was divided into two zones: detonation wave zone and shock wave zone. It is found that the overpressure of shock waves at the same distance from the explosion center increased with the diameters, but the variations of heights had little impact on the overpressure. Therefore, the pancake-shaped cloud of fuel-air mixtures is the optimal shape for obtaining the wider overpressure field. Moreover, it is found that the overpressure field gets the maximum under the diameter-to-height ratios of 5.7 in the same distance within the studied range.

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Section: Methodsmentioning

confidence: 99%

“…Only the appropriate of pancake-shaped cloud can result in the largest range of overpressure. [17] is a simple method for vapor cloud explosion blast modeling based on the multienergy concept. The results can be expressed with the distance to center of the cloud and the explosion strength.…”

Section: Overpressure At Various Diameter-to-height Ratios Ofmentioning

confidence: 99%

Influences of the Cloud Shape of Fuel-Air Mixtures on the Overpressure Field

Bai

Wang

et al. 2016

Shock and Vibration

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“…By the Eqns. (7) and (8), the initial central HE explosion pressure load and the pressure duration are crucial to the TDF deceleration. under the condition of other parameters unchanged, taking a as 0.5 MPa, 1 MPa, 2 MPa, respectively, the results are displayed in Fig.…”

Section: Impact Of a On Tdf Displacementmentioning

confidence: 99%

Optimal Falling Track Design for Twice detonating Fuze of Double event Fuel air Explosive with High Speed

Zhang

2020

Def. Sc. Jl.

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To prevent the initiation failure caused by the uncontrolled fuze and improve the weapon reliability in the high-speed double-event fuel-air explosive (DEFAE) application, it is necessary to study the TDF motion trajectory and set up a twice-detonating fuze (TDF) design system. Hence, a novel approach of realising the fixed single-point center initiation by TDF within the fuel air cloud is proposed. Accordingly, a computational model for the TDF motion state with the nonlinear mechanics analysis is built due to the expensive and difficult full-scale experiment. Moreover, the TDF guidance design system is programmed using MATLAB with the equations of mechanical equilibrium. In addition, by this system, influences of various input parameters on the TDF motion trajectory are studied in detail singly. Conclusively, the result of a certain TDF example indicates that this paper provides an economical idea for the TDF design, and the developed graphical user interface of high-efficiency for the weapon designers to facilitate the high-speed DEFAE missile development.

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“…Additionally, lots of work was concentrated on the influence of device parameters. Some disperse parameters such as canister design, buster type and mass were studied by A. Apparao et al [12] in the dispersion test. The results indicated that 55 g of nitro-guanidine (NQ) was optimal for the dispersion of 4.3 kg of propylene oxide fuel.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of disperse process of fuel‐air explosive based on the computational fluid dynamics

Ruipeng,

Xianzhen,

Wengang

et al. 2023

Propellants Explo Pyrotec

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The formation process of fuel cloud is easily affected by the material properties of fuel mixture and the structural qualities of manufacture. The spread region of fuel cloud plays an important role in the damage performance of FAE bomb. However, there are not sufficient simulation study on the disperse process, lacking a useful model for calculating the fuel cloud size due to the physical complexity in disperse process. In this work, a FAE bomb was designated at first and an experiment was carried out to measure the fuel cloud diameters. And then a computational model was established to illustrate the formation process of fuel cloud. This computational model consisted of an explosion dynamics model in the near‐field stage and a fluid dynamics model in the far‐field stage. Furthermore, multiphase turbulence flow, discrete phase and species chemical transportation were incorporated in the fluid dynamics model. The results showed that good agreements were yielded by comparison of the simulation results and experimental data for the fuel cloud diameters. The fuel cloud diameter at 220 ms was 9.11 m for simulation and 9.37 m for experiment. Additionally, it was also discussed the influence of particle size distribution on the formation process of fuel cloud. Larger particles were more likely to aggregate at the outside region of fuel cloud due to individual inertial influence. This study can provide an effective computation model for evaluation of the fuel cloud region, which can be worthwhile in understanding the physical mechanism of disperse process.

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Studies on formation of unconfined detonable vapor cloud using explosive means

Cited by 21 publications

References 6 publications

Influences of the Cloud Shape of Fuel-Air Mixtures on the Overpressure Field

Influences of the Cloud Shape of Fuel-Air Mixtures on the Overpressure Field

Optimal Falling Track Design for Twice detonating Fuze of Double event Fuel air Explosive with High Speed

Numerical simulation of disperse process of fuel‐air explosive based on the computational fluid dynamics

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