CFD Investigation of Flame and Pressure Wave Propagation through Variable Concentration Methane-Air Mixtures in a Tube Closed at One End

Peng, Zhengbiao; Zanganeh, Jafar; Ingle, Rahul; Nakod, Pravin; Fletcher, David F.; Moghtaderi, Behdad

doi:10.1080/00102202.2019.1685987

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…The much faster propagation speed of pressure waves than those of flame is due to the rapid expansion of hot gases pushing the unburnt gases towards the tube open end. The results are in in line with the deflagration theory presented in our earlier studies [3,16,19].…”

Section: Flame and Pressure Wave Propagation In An Empty Tubesupporting

confidence: 92%

“…The velocity field corresponds to the pressure field, with alternate high and low speed regions. previously reported and results of other researchers in the literature (e.g., [16,19,20]). There are peaks on the pressure profiles (Figure 6b) which indicate the arrival of pressure waves.…”

Section: Flame and Pressure Wave Propagation In An Empty Tubesupporting

confidence: 67%

“…The numerical mod veloped for the research, namely the FGM-based model, applies to problems pertin the VAM abatement featuring the deflagration of methane−air mixtures (with diff initial/operating and boundary conditions). Several relevant works conducted in group have been published (see e.g., [3,16]), where extensive validation of the deve FGM-based combustion model was presented using our own experimental data from ferent perspectives, including transient evolution of local absolute pressure, local mum pressure, pressure wave propagation speed, and flame front propagation spe these works, the FGM-based model was applied to solve problems encountered i operation of real VAM abatement systems, such as the explosion propagation dyn in large-scale tubes and through fixed beds of RTO devices. Figure 4 shows the com sons between predicted results and measured values of propagation speeds of flam pressure waves.…”

Section: Model Validationmentioning

confidence: 99%

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Influence of Gradually Inflated Obstructions on Flame Propagation in a Tube Closed at One End

Peng

Zanganeh

Moghtaderi

2023

Fire

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Rapid suppression is a must in the mitigation of ventilation air methane (VAM) explosions. Flame suppression proves to be much more challenging than prevention of flame initiation due to the small physics timescale (~1 s). This study numerically investigates the effect of spherical obstructions on flame propagation dynamics in a tube closed at one end. Obstructions with an inflating geometry, installed at different locations, were examined. Noticeably, in the presence of a single or multiple obstructions that partially block the tube, flame and pressure waves propagate faster upstream than in an empty tube; this phenomenon is more pronounced when the obstruction is located further away from the ignition point. In scenarios of a full blockage of the tube, the high pressure builds up inside the blocked region, e.g., surging up to 7.5 bar in less than 0.1 s at a location 10 m away from the ignition point (tube diameter: 0.456 m). Obstructions located closer to the ignition point experience more tearing in terms of duration and strength.

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Section: Flame and Pressure Wave Propagation In An Empty Tubesupporting

confidence: 92%

Section: Flame and Pressure Wave Propagation In An Empty Tubesupporting

confidence: 67%

Section: Model Validationmentioning

confidence: 99%

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Influence of Gradually Inflated Obstructions on Flame Propagation in a Tube Closed at One End

Peng

Zanganeh

Moghtaderi

2023

Fire

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“…The planar flame front rapidly changes into a bullet shape ( t = 0.05 s) as a result of the intrinsic instabilities (i.e., the Landau–Darrieus instability and the Rayleigh–Taylor instability) of the planar flame front. , Clanet and Searby viewed this geometry transition of the flame front as the main mechanism that drives the flame self-acceleration. In this stage, more importantly, the flame front is coupled with the pressure wave front; , therefore, the energy released from methane combustion is immediately transmitted to increase the amplitude of the pressure wave. As a result, the flame propagates increasingly faster toward the fixed bed, as indicated by the time-series flame profiles in Figure .…”

Section: Resultsmentioning

confidence: 99%

Flame Propagation and Reflections of Pressure Waves through Fixed Beds of RTO Devices: A CFD Study

Peng

Zanganeh

Doroodchi

et al. 2019

Ind. Eng. Chem. Res.

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Computational fluid dynamics (CFD) investigation of flame propagation and reflections of pressure waves through the fixed bed in a detonation tube (DT) is presented. A partially premixed combustion model involving no adjustable parameters is developed based upon the Flamelet Generated Manifold model to simulate the explosion of methane–air mixtures. A fixed bed with the detailed porous structure is generated using the discrete element method. Experiments are conducted to collect benchmark data to extensively validate the combustion model. After propagating into the fixed bed, the flame was sheared apart and locally engulfed the unburnt methane, which in turn resulted in rapid combustion. Due to reflections and resistance from the bed, the upstream pressure kept increasing until the flame passed the bed; this phenomenon was found to be more pronounced for longer propagation or bed length. Introducing the fixed bed into DT thus to induce rapid combustion might be an effective means to reach the deflagration-to-detonation transition.

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“…e process of combustion is initiated by the formation of the subsonic regions that originated from the holders. e subsonic regions result in the propagation of acoustic waves that infect the mixing process [8][9][10]. ese pressure waves induce instabilities in the combustion process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Effect of Inflow Mach Numbers on the Combustion Characteristics of a Typical Cavity-Based Supersonic Combustor

Bordoloi

Pandey

Sharma

2021

Mathematical Problems in Engineering

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The air-breathing engines, commonly known as Supersonic Combustor Ramjet (SCRAMJET) engines, are one of the most prominent technologies among researchers due to their high thrust-to-weight ratio. The researchers are constantly making efforts for improved performance of the combustor under the required boundary conditions. The present working computational model studies a hydrogen-fueled parallel cavity scramjet combustor to recognize the complex flow field characteristics and performance of the combustor in Ansys 15.0. The computational model developed is a replica of an experiment conducted in China which slightly modified the boundary conditions. The standard two-equation K- ε turbulence model and Reynolds averaged Navier Stokes (RANS) equation with finite-rate/eddy dissipation species reaction model are used to simulate the problem. The validation of the present model is achieved by comparing the results with already available experimental data in conformity with the literature. The results of the simulations are in satisfactory accord with the experimental data and images. Furthermore, to achieve the stated objective, different incoming Mach numbers, namely, 2.25, 2.52, and 2.75, are considered for a more clear understanding of variables that affects the characteristics of the flow field. The temperature, Mach number, density pressure, and H2O mass fraction contours were studied to facilitate proper understanding. The maximum temperature rise observed is 2711.467 K for M = 2.25. Additionally, the performance parameters, namely, combustion and mixing efficiencies, are also studied. The maximum combustion and mixing efficiencies are 87.47% and 98.15% for M = 2.25 and 2.75, respectively.

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CFD Investigation of Flame and Pressure Wave Propagation through Variable Concentration Methane-Air Mixtures in a Tube Closed at One End

Cited by 10 publications

References 41 publications

Influence of Gradually Inflated Obstructions on Flame Propagation in a Tube Closed at One End

Influence of Gradually Inflated Obstructions on Flame Propagation in a Tube Closed at One End

Flame Propagation and Reflections of Pressure Waves through Fixed Beds of RTO Devices: A CFD Study

Numerical Investigation on the Effect of Inflow Mach Numbers on the Combustion Characteristics of a Typical Cavity-Based Supersonic Combustor

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