Numerical study of the effects of vent opening time on hydrogen explosions

Pang, Lei; Hu, Qianran; Zhao, Junjuan; Lv, Pengfei; Sun, Siheng; Yang, Kai

doi:10.1016/j.ijhydene.2019.04.175

Cited by 32 publications

(6 citation statements)

References 27 publications

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“…e simulation calculation in this paper adopts the same numerical model as literature [2]. e reliability of numerical model has been verified in the famous BFETS and MERGE experimental tests, and the numerical simulation results were in good agreement with the experimental results [16].…”

Section: Numerical Modelsmentioning

confidence: 65%

“…e numerical simulation restores the actual overpressure peak structure. Owing to the uncertainty of the experimental device, the accuracy of the sensor, and the experimental process, the error may be caused by a combination of factors, such as experimental test and computational domain dispersion [2]. In summary, it is feasible to solve the transient flow field problem of indoor gas vented explosions under congestion conditions using the above numerical methods.…”

Section: Experimental Validation Of the Modelmentioning

confidence: 99%

“…Civil gas explosion accidents usually occur in the kitchen and mainly involve natural gas explosions. e influence of restraint conditions on gas explosions is extremely significant [2,3]. A natural gas explosion in the kitchen will not only develop into a restrained explosion venting process because of the effects of doors and windows but also be affected by congestion, such as furniture and electrical equipment.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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The process of gas explosion venting in a typical Chinese civil kitchen was investigated using computational fluid dynamics technology, focusing on the impact of the scale and cross-sectional characteristics of congestion, such as common furniture and electrical appliances, on the explosion flow-field parameters. An asymmetrical distribution of congestion will cause the uneven combustion of explosion flames in the kitchen. The flame will initially spread on one side of the room and then accelerate toward the surrounding areas, thereby increasing the risk of indoor gas explosion. The typical indoor overpressure change process can be divided into five stages, among which Stage V is found to be related to pseudoclosed combustion. Large-scale congestion has an obstructive effect on the explosion flow field, but it changes under certain conditions, while small-scale congestion only acts as a promoter. The flat congestion cross section helps maintain the stability of the flame structure, whereas the continuous and abrupt change of the congestion cross section can induce strong turbulent combustion. The research results provide a theoretical basis for the prevention and control of natural gas explosion hazards in civil kitchens from the perspective of congestion scale and cross-sectional mutation.

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Section: Numerical Modelsmentioning

confidence: 65%

Section: Experimental Validation Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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“…e overpressure peak P 2 may be the result of the combined effect of the peak indoor maximum flame area and the external secondary explosion. Pang et al [30] also had the same explanation about the relevant content. ey thought that when the combustion rate is relatively larger and the peak combustion rate changes rapidly, an external secondary explosion may have occurred.…”

Section: Combustion Rate and Flamementioning

confidence: 83%

Numerical Simulation of Interaction between Large‐Scale Congestion and Vent during the Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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The influence of large-scale congestion on a confined natural gas explosion in a typical Chinese kitchen was studied using the computational fluid dynamics technology. It was found that opening the explosion venting surface promotes the development of turbulence, flame propagation velocity, and multipeak overpressure in the explosion flow field. Large-scale congestion can significantly strengthen the influence of the explosion venting surface on the flow field; the congestion and the explosion venting surface have a synergistic effect on the explosion flow field. At the moment of gas explosion, the flow fields in each area of the kitchen exhibit different distribution characteristics. A flow field near small-scale congestion is more likely to produce greater turbulence, combustion rate, and flame speed. The obstruction effect of large-scale congestion perpendicular to the flame propagation direction is dominant. The indoor flame propagation speed and overpressure development speed increase and the peak combustion rate and indoor peak overpressure decrease with an increase in obstacle blockage. Increases in the large-scale volume congestion rate and volume blockage in the kitchen induce changes in the indoor flame propagation mode and increase the external explosion overpressure. This paper investigated the correlation behavior between large-scale congestion and vent surface in a typical Chinese civil kitchen during natural gas explosion process and provided important support for understanding the mechanism of congestion on gas explosion process and the distribution of explosion hazards in a kitchen.

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“…The impact of EVP dimensions on explosion temperature, excessive pressure, air flow velocity was analyzed. Other factors affecting the processes that occur during explosions within certain volumes were explored in work [14]. In par-ticular, the authors analyzed impact of EVP opening time on explosion characteristics.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Revealing patterns of the effective mechanical characteristics of cellular sheet polycarbonate for explosion venting panels

Pozdieiev

Myhalenko

Nuianzin

et al. 2020

EEJET

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В середині виробничих приміщень можуть утворюватися вибухонебезпечні концентрації різних речовин. За наявності достатньої кількості кисню та джерела запалення така ситуація закінчується вибухом, який може призвести до руйнування будівельних конструкцій та будівлі в цілому. З метою захисту промислових будинків від можливих руйнувань внаслідок вибуху усередині приміщення здійснюють зміцнення й посилення стійкості несучих конструкцій. Одним із дієвих способів захисту будівельних конструкції від надлишкового тиску вибуху є застосування легкоскидних конструкцій. З метою розв'язання практичних завдань вибухозахисту промислових будинків і споруд необхідно однаковою мірою вміти підібрати площу та параметри легко скидних конструкцій. Крім того, для зниження виникаючих навантажень до безпечних величин необхідно правильно розрахувати несучі конструкції на динамічну стійкість при збереженні їх несучої здатності. Поставлена задача забезпечення захисту проти вибуху за допомогою безінерційних легкоскидних конструкцій із гнучкими елементами може бути вирішена шляхом комплексного врахування механічних властивостей стільникових полікарбонатних листів. Проведені експериментальні дослідження поведінки безінерційних легкоскидних конструкцій із гнучкими огороджувальними елементами під впливом динамічних навантажень в умовах вибуху. На основі отриманих результатів визначено ефективну жорсткість та критичне переміщення стільникових полікарбонатних листів гнучких елементів. Встановлено, що для стільникових полікарбонатних листів товщиною 4-8 мм ефективна жорсткість лежить у межах 301-215 Н•м при цьому критичне переміщення країв становитиме 2,9-9,8 мм. Запропоновано математичну модель, що враховує вплив геометричних розмірів та критичного значення прогину полікарбонатного листа, як гнучкого елементу огородження, на умови спрацювання легкоскидних конструкцій Ключові слова: легкоскидні конструкції, полікарбонатний стільниковий лист, ефективні механічні характеристики, експериментально-розрахунковий метод UDC 614.

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Numerical study of the effects of vent opening time on hydrogen explosions

Cited by 32 publications

References 27 publications

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Numerical Simulation of Interaction between Large‐Scale Congestion and Vent during the Natural Gas Explosion in a Kitchen

Revealing patterns of the effective mechanical characteristics of cellular sheet polycarbonate for explosion venting panels

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