Topic
Overpressure
About: Overpressure is a research topic. Over the lifetime, 3236 publications have been published within this topic receiving 34648 citations.
Papers published on a yearly basis
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TL;DR: In this article, the authors describe the origin of these pressure differences as rapid loading and steady flow, and they suggest that stratigraphic layering focuses fluid flow toward structural highs.
19 citations
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TL;DR: In this article, the effect of ignition location and vent burst pressure on the internal pressure-time history and external flame propagation was investigated for vented explosions of hydrogen-air mixtures in a small cylindrical vessel.
Abstract: The effect of ignition location and vent burst pressure on the internal pressure-time history and external flame propagation was investigated for vented explosions of hydrogen–air mixtures in a small cylindrical vessel. A high-speed camera was used to record videos of the external flame while pressure transducers were used to record pressure-time histories. It was found that central ignition always leads to the maximum internal peak overpressure, and front ignition resulted in the lowest value of internal peak overpressure. The internal peak overpressures are increased corresponding to the increase in the vent burst pressure in the cases of central and rear ignition. Because of the effect of acoustic oscillations, the phenomenon of oscillations is observed in the internal pressure profile for the case of front ignition. The pressure oscillations for the cases of rear and central ignition are triggered by external explosions. The behavior of flames outside the chamber is significantly associated with the internal pressure of the chamber so that the velocity of the jet flame is closely related to the internal overpressure peak.
19 citations
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TL;DR: In this article, the authors investigated the internal overpressure and external temperature behaviors of explosion venting in a self-designed 4.5m3 square chamber, by changing the solid obstacles, ignition positions, and initial turbulence levels.
19 citations
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TL;DR: In this article, the authors performed unconfined explosion experiments under different methane concentrations at 27 m3 scale with internal and external obstacles and found that the flame buoyant effect was more obvious for the rich-fuel flame due to the excess methane accumulation.
19 citations
01 Sep 1995
TL;DR: In this paper, an SR-71 aircraft generated sonic booms at ground level and atmospheric data were recorded for each flight, at altitude of 31,000 to 48,000 ft, and at various gross weights.
Abstract: SR-71 sonic boom signatures were measured to validate sonic boom propagation prediction codes. An SR-71 aircraft generated sonic booms from Mach 1.25 to Mach 1.6, at altitudes of 31,000 to 48,000 ft, and at various gross weights. An F-16XL aircraft measured the SR-71 near-field shock waves from close to the aircraft to more than 8,000 ft below, gathering 105 signatures. A YO-3A aircraft measured the SR-71 sonic booms from 21,000 to 38,000 feet below, recording 17 passes. The sonic booms at ground level and atmospheric data were recorded for each flight. Data analysis is underway. Preliminary results show that shock wave patterns and coalescence vary with SR-71 gross weight, Mach number, and altitude. For example, noncoalesced shock wave signatures were measured by the YO-3A at 21,000 ft below the SR-71 aircraft while at a low gross weight, Mach 1.25, and 31,000-ft altitude. This paper describes the design and execution of the flight research experiment. Instrumentation and flight maneuvers of the SR-71, F-16XL, and YO-3A aircraft and sample sonic boom signatures are included.
19 citations