An Empirical Non-TNT Approach to Launch Vehicle Explosion Modeling

Blackwood, James M.; Skinner, Troy; Richardson, E. H.; Bangham, Michal E.

doi:10.2514/6.2015-0560

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Therefore, the length-diameter ratio of TNT is h0/2r0. Given the mass of TNT, r0, and h0 of TNT cylinder can be calculated by using Equation (10) which is derived from Equation (9). Unit system of cm-g-ms is adopted in the numerical model.…”

Section: Modeling Geometry and Meshingmentioning

confidence: 99%

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Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

Wang

Cui

et al. 2019

Applied Sciences

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A massive explosion of a liquid-propellant rocket in the course of an accident can lead to a truly catastrophic event, which would threaten the safety of personnel and facilities around the launch site. In order to study the propagation of near-ground shock wave and quantify the enhancement effect on the overpressure, models with different grounds have been established based on an explicit nonlinear dynamic ANSYS/LS-DYNA 970 program. Results show that the existence of the ground will change the propagation law and conform to the reflection law of the shock wave. Rigid ground absorbs no energy and reflects all of it, while concrete ground absorbs and reflects some of the energy, respectively. Ground may influence the pressure-time curve of the shock wave. When the gauge is close to the explosive, the pressure-time curve presents a bimodal feature, while when the gauge reaches a certain distance to the explosive, it presents a single-peak feature. For gauges at different heights, different grounds may have different effects on the peak overpressure. For gauges of height not greater than 4 m, the impact on the shock wave is obvious when the radial to the explosive is small. On the contrary, as for the gauges of height greater than 4 m, the impact on the shock wave is obvious when the radial to the explosive is big. Ground has the enhancement effect on peak overpressure, but different grounds have different ways. For rigid ground, the peak overpressure factor is about 2. However, for the concrete and soil ground, peak overpressure factor is from 1.43 to 2.1.

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Section: Modeling Geometry and Meshingmentioning

confidence: 99%

“…Many workers have studied liquid propellant explosion characteristics by conducting experiments and analyzing experimental data [2][3][4][5][6][7][8][9]. The liquid propellant explosion test has high risk and high cost, and the experimental conditions are strict and the repeatability is poor, which makes it difficult.…”

Section: Introductionmentioning

confidence: 99%

Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

Wang

Cui

et al. 2019

Applied Sciences

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“…All available empirical data from full scale launch vehicle explosion tests and accidents was assembled. Crew survivability from catastrophic explosions could be increased in this way [9].…”

Section: Introductionmentioning

confidence: 99%

Prediction Method of Blast Wave Impact on Crew Module for Liquid Rocket Explosion on Launch Pad

Wang

Cui

et al. 2019

Applied Sciences

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The role of manned space flight in the field of space exploration and utilization is growing. However, the security system of the manned spaceflight is still imperfect. In the case that the rocket explodes, crew modules maybe damaged by the blast wave, which will threaten the safety of the crews. This research aims to obtain the necessary data and information to enable the designers of the launch vehicles and crew modules to develop safer launch systems. To this end, this paper proposes a numerical method using LS-DYNA to study the propagation law of blast waves caused by rocket explosion on the launch pad and to quantify the impact of the blast wave on crew module. The numerical results indicate that the final blast waveform of the model with rocket is conical in the upper and lower parts, and spherical in the middle. At the same time, the third-stage explosion is the most harmful to the crew module, while the first-stage explosion is the least. Furthermore, the model with rocket has a marked effect on explosion strength: the pressure enhancement factor is about 4–17 times. Most importantly, overpressure prediction formula acting on the crew modulesof explosion on the launch pad is established for quick peak overpressure predicting and damage evaluating.

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An Empirical Non-TNT Approach to Launch Vehicle Explosion Modeling

Cited by 2 publications

References 14 publications

Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

Prediction Method of Blast Wave Impact on Crew Module for Liquid Rocket Explosion on Launch Pad

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