Using CHETAH to estimate lower flammable limit, minimum ignition energy, and other flammability parameters

2014 ◽  
Vol 33 (4) ◽  
pp. 314-328 ◽  
Author(s):  
Laurence G. Britton ◽  
Benjamin Keith Harrison
Keyword(s):  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Flammability Parameters ◽  
Lower Flammable Limit ◽  
Estimate Lower

Ignition and flame quenching of quiescent fuel mists

1978 ◽  
Vol 364 (1717) ◽  
pp. 277-294 ◽  
Keyword(s):  
Reaction Rates ◽  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Proposed Model ◽  
Theoretical Predictions ◽  
Quenching Distance ◽  
Experimental Values ◽  
Sole Criterion ◽  
Fuel Vapour ◽  
Level Of Agreement

A model is proposed for the ignition of quiescent multidroplet fuel mists which assumes that chemical reaction rates are infinitely fast, and that the sole criterion for successful ignition is the generation, by the spark, of an adequate concentration of fuel vapour in the ignition zone. From analysis of the relevant heat transfer and evaporation processes involved, ex­pressions are derived for the prediction of quenching distance and minimum ignition energy. Support for the model is demonstrated by a close level of agreement between theoretical predictions of minimum ignition energy and the corresponding experimental values obtained using a specially designed ignition apparatus in which ignition energies are measured for several different fuels, over wide ranges of pressure, mixture composition and mean drop size. The results show that both quenching distance and mini­mum ignition energy are strongly dependent on droplet size, and are also dependent, but to a lesser extent, on air density, equivalence ratio and fuel volatility. An expression is derived to indicate the range of drop sizes over which the proposed model is valid.

scholarly journals A model for the minimum ignition energy of dust clouds

2019 ◽  
Vol 121 ◽  
pp. 43-49 ◽  
Author(s):  
Sepideh Hosseinzadeh ◽  
Jan Berghmans ◽  
Jan Degreve ◽  
Filip Verplaetsen
Keyword(s):  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Dust Clouds

Minimum ignition energy and quenching distance of aluminum dust clouds

2021 ◽  
Author(s):  
Meet Parikh ◽  
Rinrin Saeki ◽  
Rajib Mondal ◽  
Kwangseok Choi ◽  
Wookyung Kim
Keyword(s):  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Dust Clouds ◽  
Quenching Distance

scholarly journals Variation of ignition sensitivity characteristics of non-stick coal dust explosions

2020 ◽  
Author(s):  
Di Sha ◽  
Yucheng Li ◽  
Xihua Zhou ◽  
Ruiqing Li
Keyword(s):  
Ignition Temperature ◽  
Coal Dust ◽  
Dust Cloud ◽  
Particle Sizes ◽  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Dust Layer ◽  
Independent Variables ◽  
Minimum Ignition Temperature ◽  
Dust Explosions

Abstract The ignition and explosion of coal dust are significant hazards in coal mines. In this study, the minimum ignition temperature and energy of non-stick coal dust were investigated empirically at different working conditions to identify the key factors that influence the sensitivity and characteristics of coal dust explosions. The results showed that for a given particle size, the minimum ignition temperature of the coal dust layer was inversely related to the thickness of the coal dust layer. Meanwhile, when the layer thickness was kept constant, the minimum ignition temperature of the coal dust layer decreased with smaller coal dust particle sizes. Over the range of particle sizes tested (25–75 μm), the minimum ignition temperature of the coal dust cloud gradually increased when larger particles was used. At the same particle size, the minimum ignition temperature of the coal dust layer was much lower than that of the coal dust cloud. Furthermore, the curves of minimum ignition energy all exhibited a minimum value in response to changes to single independent variables of mass concentration, ignition delay time and powder injection pressure. The interactions of these three independent variables were also examined, and the experimental results were fitted to establish a mathematical model of the minimum ignition energy of coal dust. Empirical verification demonstrated the accuracy and practicability of the model. The results of this research can provide an experimental and theoretical basis for preventing dust explosions in coal mines to enhance the safety of production.

Numerical study on the minimum ignition energy of a methane-air mixture

Fuel ◽  
2021 ◽  
Vol 285 ◽  
pp. 119230
Author(s):  
Haitao Lu ◽  
Fuqiang Liu ◽  
Kaixing Wang ◽  
Gang Xu ◽  
Henry J. Curran
Keyword(s):  
Numerical Study ◽  
Ignition Energy ◽  
Minimum Ignition Energy
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