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Overpressure

About: Overpressure is a research topic. Over the lifetime, 3236 publications have been published within this topic receiving 34648 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors examine the control of gas invasion through sieved sands that are suspended within the water column as air is injected slowly from below and monitor the thickness of the free gas column that accumulates beneath the sand to gauge the difference between the gas and liquid pressure, or overpressure, just prior to gas invading and passing through the sand layer.

40 citations

Journal ArticleDOI
15 May 2018-Energy
TL;DR: In this article, the effect of vent burst pressure on the whole explosion in a 2.5m stainless cylindrical vessel with the ethylene-air mixture is investigated as a function of the vent area and burst pressure, and it is shown that the dominant peak overpressure will change with different vent areas.

39 citations

Journal ArticleDOI
TL;DR: In this article, a pressure measurement system was established to study the pressure field of the electric spark discharge process, and a good linear relationship between shock wave energy and electric spark energy was established.
Abstract: Shock wave generated by electric spark discharge was studied experimentally and the shock wave energy was evaluated in this paper. A pressure measurement system was established to study the pressure field of the electric spark discharge process. A series of electric spark discharge experiments were carried out and the energy of the electric spark used in present study was in the range of 10 J, 100 J, and 1000 J, respectively. The shock wave energy released from the electric spark discharge process was calculated by using the overpressure values at different measurement points near the electric spark discharge center. The good consistency of shock wave energies calculated by pressure histories at different measuring points in the same electric spark discharge experiment illustrates the applicability of the weak shock wave theory in calculating the energy of shock wave induced by electric spark discharge process. The result showed that shock wave formed at the initial stage of electric spark discharge process, and the shock wave energy is only a little part of electric spark energy. From the analysis of the shock wave energy and electric spark energy, a good linear relationship between shock wave energy and electric spark energy was established, which make it possible to calculate shock wave energy by measuring characteristic parameters of electric spark discharge process instead of shock wave. So, the initiation energy of direct initiation of detonation can be determined easily by measuring the parameters of electric spark discharge process.

39 citations

DOI
01 Mar 2013
TL;DR: In this article, the authors used LS-DYNA finite element analysis software to simulate a near-field explosion by using Arbitrary-Lagargian-Eulerian (ALE) fluid-structure interaction algorithm.
Abstract: The objective of this study is to simulate shock wave due to near-field explosion by using Arbitrary-Lagargian-Eulerian (ALE) fluid-structure interaction algorithm in the LS-DYNA finite element analysis software. Overpressure from near-field burst simulation was compared to the U. S. Army Technical Manual TM5-1300, with relative difference of 5%, for a scaled distance from 0.09 to 0.29 m/kg^(1/3). The results showed that LS-DYNA can predict near-field explosion. Furthermore, using LS-DYNA Mapping 2D to 2D technology can effectively increase the numerical model size of which scaled distance can be extended from 0.09 to 0.61 m/kg^(1/3).

39 citations

Journal ArticleDOI
A. Denkevits, S. Dorofeev1
01 Nov 2005
TL;DR: In this article, the effect of graphite particle size on the explosion performance of tungsten and graphite dust in the range 4-45μm was studied. But the results showed that the graphite particles had a profound effect on their explosion characteristics, including maximum overpressure and rate of pressure rise.
Abstract: Addressing the dust explosion hazard in ITER, a standard method with a 20-l-spherical combustion chamber was used to measure the explosion indices of fine graphite and tungsten dusts and their mixtures. The indices include maximum overpressure, maximum rate of pressure rise, and lower explosion concentration limit. The effect of dust particle size was studied on the explosion behaviour of graphite dusts in the range 4–45 μm. The explosion indices of 1 μm tungsten dust and its mixtures with 4 μm graphite dust were measured. The graphite dust particle size is shown to have a profound effect on the explosion characteristics. The finest dust features the highest maximum overpressure and rate of pressure rise, and the lowest explosible concentration. Four tungsten/graphite dust mixtures with molar ratios of W/C = 1/30, 1/4, 1/1, and 3/1 were tested at the concentrations at which the dust combustion consumed all the oxygen in air producing maximum overpressures and rates of pressure rise. The maximum overpressure decreases slightly with increasing tungsten content, while the maximum rate of pressure rise has a pronounced peak at W/C=1/1, i.e. this mixture burns faster than both pure graphite and pure tungsten dusts alone. All the tested dusts belong to the mildest explosion class.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023263
2022504
2021174
2020173
2019171
2018174