Maximum overpressure vs. H2 concentration non-monotonic behavior in vented deflagration. Experimental results

Schiavetti, M.; Carcassi, Marco Nicola Mario

doi:10.1016/j.ijhydene.2016.03.180

Cited by 47 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the mass flow suddenly decreased at 295 ms, the combustion rate increased abruptly, and peak P ext was formed [27]. In Stage IV, the overpressure, combustion rate, and mass flow all fluctuate for a short time near the maximum value and then suddenly decrease, which is mainly attributed to the maximum flame area caused by the refrigerator [28]. As shown in Figure 8(b), the flame propagates toward the wall at a faster speed at 316 ms. At this time, the flame area reaches its maximum, thus forming the peak P mfa , until the flame area and mass flow begin to decrease, and the overpressure drops rapidly.…”

Section: Characteristics Of Overpressure Formation and Flamementioning

confidence: 99%

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

Pang

Jin

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: Characteristics Of Overpressure Formation and Flamementioning

confidence: 99%

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

Pang

Jin

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…proper formulation for accounting for obstacles. Both these models show a large scatter in predictions for realistic obstacle used in recent studies [24,25].…”

Section: Comparison Of New Model Predictions and Experimental Resultsmentioning

confidence: 99%

“…(i) Bauwens et al [4] (ii) Kumar [20] (iii) Daubech et al [21] (iv) Kumar [22] (v) Bauwens et al [23] (vi) Schiavetti and Carcassi [24] (vii) Skjold et al [25] (viii) Daubech et al [35] The experimental results are divided into various sets depending upon the complexity of the experiments and their applicability in real accidental scenarios. (ii) Kumar [20] (iii) Daubech et al [21] (iv) Daubech et al [35] Bauwens et al [4] carried out experiments in their 63.7 m 3 cuboidal enclosure and tested the variation of hydrogen concentrations, vent areas, and ignition locations.…”

Section: Model Predictions For Overpressurementioning

confidence: 99%

“…Hence these cases represent accidental scenario more closely. Experimental studies considered in this section are: (i) Bauwens et al[4] (ii) Schiavetti and Carcassi[24] (iii) Skjold et al[25] shows predictions for results from Bauwens et al[4] containing obstacles. Both the ignition locations used in experiments are shown with different symbols.…”

mentioning

confidence: 99%

“…Model predictions for experiments of Bauwens et al[4] with obstacles compared with experimental results Schiavetti and Carcassi[24] carried out a systematic study to assess the effect of differentobstacle configuration on overpressure. Comparison for their results and corresponding predictions are shown in figure 8.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Performance evaluation of empirical models for vented lean hydrogen explosions

Sinha

Rao

Wen

2019

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

show abstract

Structural response for vented hydrogen‐air deflagrations: Effects of volumetric blockage ratio

Wang,

Liang,

Lin

et al. 2023

Process Safety Progress

View full text Add to dashboard Cite

The explosion venting experiments of hydrogen‐air premixed gas were carried out in a 1‐m3 cuboid container. The effects of the obstacles parallel to the vent on the structural response of the container during the explosion venting were investigated. The internal overpressure and acceleration of the vessel wall were captured by acceleration and pressure sensors, respectively. The time–frequency distributions of pressure and acceleration were obtained by a Short‐Time Fast Fourier Transform. The effects of obstacles on the dynamic structure response were studied by analyzing the internal overpressure, vibration acceleration, and high‐speed videos. With the increase of obstacles, the maximum overpressure and vessel vibration increased, and the maximum overpressure and maximum vibration acceleration appeared earlier. The vibration signals had two dominant frequencies, 300‐600 Hz and 900‐1200 Hz. The low‐frequency vibration (300–600 Hz) was induced by acoustic oscillation of the internal pressure. The high‐frequency vibration (900–1200 Hz) was a container resonance triggered by the coupling of the flame and the acoustic wave. As VBR increased, the duration of high‐frequency oscillations decreased gradually; the increase of obstacles would weaken the high‐frequency structural response of the container. The results can guide the design of hydrogen explosion protection and mitigation measures.

show abstract

Maximum overpressure vs. H2 concentration non-monotonic behavior in vented deflagration. Experimental results

Cited by 47 publications

References 11 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

Performance evaluation of empirical models for vented lean hydrogen explosions

Structural response for vented hydrogen‐air deflagrations: Effects of volumetric blockage ratio

Contact Info

Product

Resources

About