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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, four venting diameters were chosen to carry out the simple venting experiments of 70-μm lycopodium dust explosions in a 20-L chamber at the elevated static activation overpressures ranging from 1.2 to 6-bar.

42 citations

Journal ArticleDOI
TL;DR: The aim of the present experimental work is to study particle dispersal with fingering effects in an original quasi-two-dimensional experiment facility in order to accurately extract information and highlight that the number of jets is unsteady and decreases with time.
Abstract: When solid particles are impulsively dispersed by a shock wave, they develop a spatial distribution which takes the form of particle jets whose selection mechanism is still unidentified. The aim of the present experimental work is to study particle dispersal with fingering effects in an original quasi-two-dimensional experiment facility in order to accurately extract information. Shock and blast waves are generated in the carrier gas at the center of a granular medium ring initially confined inside a Hele-Shaw cell and impulsively accelerated. With the present experimental setup, the particle jet formation is clearly observed. From fast flow visualizations, we notice, in all instances, that the jets are initially generated inside the particle ring and thereafter expelled outward. This point has not been observed in three-dimensional experiments. We highlight that the number of jets is unsteady and decreases with time. For a fixed configuration, considering the very early times following the initial acceleration, the jet size selection is independent of the particle diameter. Moreover, the influence of the initial overpressure and the material density on the particle jet formation have been studied. It is shown that the wave number of particle jets increases with the overpressure and with the decrease of the material density. The normalized number of jets as a function of the initial ring acceleration shows a power law valid for all studied configurations involving various initial pressure ratios, particle sizes, and particle materials.

41 citations

Journal ArticleDOI
Sam E. Rigby1, S.D. Fay1, Andrew Tyas1, J.A. Warren1, Sam D. Clarke1 
TL;DR: In this paper, a series of well controlled experiments where pressure transducers are used to record the pressure-time history acting on the face of a large, rigid target at various angles of incidence for varying sizes of hemispherical PE4 charge and stand-off distances.
Abstract: The blast overpressure acting on a rigid target is known to vary between the normally reflected overpressure and the incident overpressure as a function of the angle between the target and the direction of travel of the blast wave. Literature guidance for determining the exact effects of angle of incidence are unclear, particularly when considering the negative phase. This paper presents the results from a series of well controlled experiments where pressure transducers are used to record the pressure-time history acting on the face of a large, rigid target at various angles of incidence for varying sizes of hemispherical PE4 charge and stand-off distances. The test data demonstrated remarkable repeatability, and excellent agreement with semi-empirical predictions for normally reflected overpressures. The oblique results show that peak overpressure, impulse and duration are highly dependent on angle of incidence for the positive phase, and are invariant of angle of incidence for the negative phase.

41 citations

Journal ArticleDOI
TL;DR: In this paper, two models were built to simulate ventilation systems in which gas explosions often occur, and the effects of bends and bifurcations and the destruction of ventilation facilities in the local network model due to an overpressure wave were analyzed.

41 citations

Journal ArticleDOI
TL;DR: An overview of the key aspects relevant to the application of the Multi-Energy method and CFD modeling is provided and an example problem involving the calculation of the explosion blast load on a structure at some distance from the explosion in an offshore platform complex is demonstrated.

41 citations


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