Experimental and numerical study on spontaneous ignition of hydrogen and hydrogen-methane jets in air

Rudy, W.; Dąbkowski, A.; Teodorczyk, A.

doi:10.1016/j.ijhydene.2014.05.077

Cited by 53 publications

(19 citation statements)

References 12 publications

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“…At the same time it should be taken into account that a larger number of experiments (156) was conducted for d = 10 mm than for d = 6 mm (96) or for d = 14 mm (108). The tube length dependence seems to be non-linear, especially for tubes shorter than 40 mm as there was no ignition for experiments for L = 25 mm and pressures up to around 16 MPa for any of the diameters considered [25,26]. Similar trend of rapid increase of ignition limit was reported by Grune et al [16] for 30-40 mm tubes.…”

Section: Resultssupporting

confidence: 76%

“…Cumulative diagrams of burst pressure ignition limit obtained for various extension channel lengths (50-100 mm) and diameters (6, 10, 14 mm) for cases with 10% N 2 addition to hydrogen Figure 6. Comparison between burst pressure ignition limits obtained for pure hydrogen [25,26] and hydrogen-nitrogen mixtures Additionally, nitrogen addition seems to stabilise the self-ignition process independently on the tube diameter as ignition limit curves for 5% and 10% and respective diameters almost overlap. Slight discrepancies among specific diameters cases may be observed for 40 mm tube but a similar trend is visible for pure hydrogen and is probably caused by unstable ignition and combustion processes which result in the non-linear limit curve behaviour for shorter tubes.…”

Section: Resultsmentioning

confidence: 99%

“…The results obtained for pure hydrogen release reported in previous work [25] (344 experiments) and slightly updated [26] (to 360 experiments) were treated as a point of reference. Typical recordings of the sensors for cases with and without ignition are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental stand used was previously utilized for hydrogen and hydrogen-methane mixtures self-ignition process [25]. The experimental stand was divided into three main sections (see Fig.…”

Section: Experimental Stand and Proceduresmentioning

confidence: 99%

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Self-ignition of hydrogen–nitrogen mixtures during high-pressure release into air

Rudy

Teodorczyk

Wen

2017

International Journal of Hydrogen Energy

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This paper demonstrates experimental and numerical study on spontaneous ignition of H 2 -N 2 mixtures during high-pressure release into the air through the tubes of various diameters and lengths. The mixtures included 5% and 10% (vol.) N 2 addition to hydrogen being at initial pressure in range of 4.3 -15.9 MPa. As a point of reference pure hydrogen release experiments were performed with use of the same experimental stand, experimental procedure and extension tubes. The results showed that N 2 addition may increase the initial pressure necessary to self-ignite the mixture as much as 2.12 or 2.85 -times for 5% and 10% N 2 addition respectively. Additionally, simulations were performed with use of Cantera code (0-D) based on the ideal shock tube assumption and with the modified KIVA3V code (2-D) to establish the main factors responsible for ignition and sustained combustion during the release.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Stand and Proceduresmentioning

confidence: 99%

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Self-ignition of hydrogen–nitrogen mixtures during high-pressure release into air

Rudy

Teodorczyk

Wen

2017

International Journal of Hydrogen Energy

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“…A lot of research has been [17][18][19][20] conducted on the numerical and experimental effect of hydrogen and methane jet on temperature distribution, stability, and NOx emissions. A research by Jeongseog et al [17] examined the impact of acoustic excitation and nitrogen dilution on NOx emission and the stabilization of the flames of turbulent diffusion.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames

Namazian

Hashemi

Namazian

2016

Archive of Mechanical Engineering

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In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence flow, k-ε model is used. In contrast to the previous works, in this study, in each one of simulations the properties of materials are taken variable and then the results are compared. The results show that at a certain flow rate of fuel, by increasing the air velocity, similar to when the properties are constant, the width of the flame becomes thinner and the maximum temperature is higher; the penetration of oxygen into the fuel as well as fuel consumption is also increased. It is noteworthy that most of the pollutants produced are NOx, which are strongly temperature dependent. The amount of these pollutants rises when the temperature is increased. As a solution, decreasing the air velocity can decrease the amount of these pollutants. Finally, comparing the result of this study and the other work, which considers constant properties, shows that the variable properties assumption leads to obtaining more exact solution but the trends of both results are similar.

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