Minimum ignition energy of hydrogen–air mixture: Effects of humidity and spark duration

Critical radius for sustained propagation of spark-ignited spherical flames

“…Due to the fact that the minimum ignition energy is a function of both the spark gap size and the spark duration [1], our study does not allow a direct comparison of the minimum ignition energy for, say, a fixed size of the ignition kernel.…”

“…First, it is recognized that existing experimental results are rather sparse, consisting of mostly the flame radius history for mixtures with near-unity Lewis numbers [10][11][12][13] or emphasizing the role of the ignition energy [1]. Furthermore, there is a need for experimental measurements of the dynamics of flames with large Lewis numbers.…”

“…Experimental studies have been conducted to determine the required ignition energy as a function of spark gap and equivalence ratio for different fuel/air mixtures [1]. While providing useful data, these studies did not include the evolution and dynamics of the flame front in the investigation.…”

Fuelling of spark ignition and homogenous charge compression ignition engines with low calorific value producer gas

“…That requirement is different for the producer gas/air mixture and it heavily depends on content of hydrogen and carbon monoxide in the gas. The minimum ignition energy for the stoichiometric hydrogen/air mixture is about 0.02 mJ, while for the carbon monoxide/air mixture it is much higher, about 0.3 mJ [11,12]. The combined mole fraction of combustible components in producer gas is usually less than 40% and the high ignition energy system is needed when fuelling engines with the producer gas.…”

Ignition Temperature of Hydrogen/Air Mixture by Hot Wire in Pipeline

“…또 한, 위험성평가 시 필요한 최악의 사고시나리오를 위한 수 소농도도 일정하지 않다. 종래 연구에서 전기스파크 (10,11) , 고압 (12) , 정전기 (13) , 레이저 (14) , 고온열면 (15) 등에 의한 수소 의 착화특성을 조사한 결과, 최소착화에너지와 최저착화온 도는 이론혼합비(φ = 1, 수소농도 약 30 vol.%)보다 약간 낮은 농도인 약 22 vol.% (8,12) , 최고화염온도는 약 30 vol.%, 연소속도는 이론혼합비보다 높은 약 40 vol.% (10,16) …”