Ignition phenomena in hydrogen-air mixtures

Rose, H. E.; Priede, T.

doi:10.1016/s0082-0784(58)80076-4

Cited by 21 publications

(4 citation statements)

References 3 publications

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“…(Note: the appearance to the eye of the microwave sparks was the same as would be expected for DC sparks: a constricted spark channel with random shape, linking the two electrodes). The results obtained for hydrogen strongly support the figure of 11 //J obtained for the absolute minimum ignition energy by Rose and Priede [14]. This was obtained by an indirect method and has been regarded as controversial.…”

Section: Discussionsupporting

confidence: 85%

“…Experiments using pulsed DC (capacitor-discharge) sparks have repeatedly shown an MIE of about 19 ^J [6,7] but Rose and Priede [14] were able to estimate the electrical losses in such an experiment and concluded that only 11 yuJ was actually absorbed in the spark. It is thus interesting to note that the present experiment confirms the latter figure. In fact, the implication of the results is that the MIE is still lower since (a) electrical losses in the cell were not taken fully into account (see Section 4.2) (b) the results for the hydrocarbons are higher than the accepted values, implying that a more 'sensitive' cell could achieve lower MIE figures.…”

Section: Resultsmentioning

confidence: 99%

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Ignition of flammable gas mixtures by X-band microwave discharges

Excell

1984

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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Mixtures of hydrogen, ethylene, propane and methane with air at NTP were ignited by sparks striking between electrodes in a cavity tuned to resonance at 9.4 GHz. The cavity was formed from a section of waveguide sealed by dielectric windows, and fed by a pulsed radar transmitter. The envelope of the radar pulse waveform reflected from the cavity was monitored using a detector and a transient data recorder; the light radiated from the sparks was observed by a photomultiplier. From the resulting signals, the behaviour of the ignition spark and the energy dissipated therein could be deduced. Values of the minimum input energy and the minimum energy absorbed in the cavity that were required for ignition were derived for each of the gas mixtures in their most easily ignited concentration, including an estimate of the error tolerance on the measurement. The measured results tended to be of the same order as, but higher than, well known earlier values for minimum ignition energy found using capacitive-discharge sparks. In the case of hydrogen, the results confirm the lower of two 'accepted' values for minimum ignition energy.

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Section: Discussionsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Ignition of flammable gas mixtures by X-band microwave discharges

Excell

1984

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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“…For example, significant reductions in E . (and d ) occur as m1.n q the electrode size is reduced or the circuit resistance is increased < · : (Rose and Priede, 1959;Ballal and Lefebvre~ 1975). For break sparks, the ignition energy approaches values listed in Table 2.1, even for spark gaps b.elow dq, due to the ·fact that broken wires present electrodes which are very small compared to the flame kernel (Litchfield, 1960).…”

Section: -22mentioning

confidence: 99%

Feasibility of methods and systems for reducng LNG tanker fire hazards

1980

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“…The minimum ignition energy of hydrogen is below 0.02 mJ in air, whereas that of other flammable gases such as methane, ethane, propane, butane, and benzene is usually higher than 0.2 mJ [1]- [3]. Hydrogen is a promising fuel which can be used for fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Measurement of OH Density and Gas Temperature in Incipient Spark-Ignited Hydrogen-Air Flame

Ono¹,

Saito²,

Maekawa³

et al. 2007

2007 IEEE Industry Applications Annual Meeting

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For investigating the spark ignition process of hydrogen-air mixture, density of OH radicals and gas temperature are measured in the incipient spark-ignited hydrogen-air flame using laser-induced predissociation fluorescence (LIPF). The spark discharge occurs between a 2-mm gap with approximately 10 ns pulse duration. Hydrogen-air mixture is ignited by spark discharge of E = 1.2 ∼ 1.4E min, where E is the spark energy and E min is the minimum ignition energy. In hydrogen(50%)-air mixture ignited with E = 1.35E min, OH density decreases after the spark discharge from 2 × 10 16 cm −3 (t = 0 µs) to 2 × 10 15 cm −3 (t = 100 µs), where t is the postdischarge time. On the other hand, the gas temperature is 900 K at t = 30 µs and 1400 K at t = 200 µs. Hydrogen(15%)-air mixture ignited with E = 1.40E min also shows the similar tendency to the hydrogen(50%)-air mixture. In stoichiometric (hydrogen(30%)-air) mixture (E = 1.25E min), OH density is approximately constant at 2 × 10 16 cm −3 for 150 µs after the spark discharge, and the gas temperature increases from 1100 K (t = 0 µs) to 1800 K (t = 150 µs). They are higher than those of other mixtures (15% and 50% hydrogen). It indicates that the reaction in the stoichiometric flame proceeds faster than other flame.

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Ignition phenomena in hydrogen-air mixtures

Cited by 21 publications

References 3 publications

Ignition of flammable gas mixtures by X-band microwave discharges

Ignition of flammable gas mixtures by X-band microwave discharges

Feasibility of methods and systems for reducng LNG tanker fire hazards

Measurement of OH Density and Gas Temperature in Incipient Spark-Ignited Hydrogen-Air Flame

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