Gas Dynamic Features of Self Ignition of Non Diluted Fuel/Air Mixtures at High Pressure

Blumenthal, Ralf; Fieweger, K.; Komp, K. H.; Adomeit, G.

doi:10.1080/00102209708935637

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…Historically, transient shock ignition phenomena have been utilized to generate conditions to study the ignition and combustion of homogenous premixed mixtures of gaseous fuels and oxidizers. Extensive literature exists on single pulse and reflected shock tube studies of premixed hydrogen-oxygen, methaneoxygen, and natural gas-oxygen mixtures (e.g., Eubank et al, 1981;Blumenthal et al, 1996;Huang et al, 2004). As noted earlier, much less work has addressed transient shock phenomena produced by compressed gas releases into air as a potential spontaneous ignition source.…”

Section: Simple Transient Shock Theory and Implicationsmentioning

confidence: 99%

“…The calculations shown in Figure 8a were performed using a constant volume assumption with the chemical ignition delay time determined as the time to pressure rise. This is a common approach for calculating shock tube ignition delay times for premixed gas mixtures (Blumenthal et al, 1996). A constant pressure assumption and other criteria for defining ignition delay yield times of very similar magnitude.…”

Section: Simple Transient Shock Theory and Implicationsmentioning

confidence: 99%

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Spontaneous Ignition of Pressurized Releases of Hydrogen and Natural Gas Into Air

Dryer

Chaos

Zhao

et al. 2007

Combustion Science and Technology

196

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This paper demonstrates the ''spontaneous ignition'' (autoignition=inflammation and sustained diffusive combustion) from sudden compressed hydrogen releases that is not well documented in the present literature, for which little fundamental explanation, discussion or research foundation exists, and which is apparently not encompassed in recent formulations of safety codes and standards for piping, storage, and use of high pressure compressed gas systems handling hydrogen. Accidental or intended, rapid failure of a pressure boundary separating sufficiently compressed hydrogen from air can result in multi-dimensional transient flows involving shock formation, reflection, and interactions such that reactant mixtures are rapidly formed and achieve chemical ignition, inflammation, and transition to turbulent jet diffusive combustion, fed by the continuing discharge of hydrogen. Both experiments and simple transient shock theory along with chemical kinetic ignition calculations are used to support interpretation of observations and qualitatively identify controlling gas properties and geometrical parameters. Although the phenomenon is demonstrated for pressurized hydrogen burst disk failures with different internal flow geometries, similar phenomena apparently do not necessarily occur for sudden boundary failures potential for producing ignition and continuing combustion. Much more experimental and computational work is required to quantitatively determine the envelope of parameter combinations that mitigate or enhance spontaneous ignition characteristics of compressed hydrogen as a result of sudden release, particularly if hydrogen is to become a major energy carrier interfaced with consumer use. Similar considerations for compressed methane, for mixtures of light hydrocarbons and methane (simulating natural gas), and for larger carbon number hydrocarbons show similar autoignition phenomena may occur with highly compressed methane or natural gas, but are unlikely with higher carbon number cases, unless the compressed source and=or surrounding air is sufficiently pre-heated above ambient temperature. Spontaneous ignition of compressed hydrocarbon gases is also generally less likely, given the much lower turbulent blow-off velocity of hydrocarbons in comparison to that for hydrogen.

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Section: Simple Transient Shock Theory and Implicationsmentioning

confidence: 99%

Section: Simple Transient Shock Theory and Implicationsmentioning

confidence: 99%

Spontaneous Ignition of Pressurized Releases of Hydrogen and Natural Gas Into Air

Dryer

Chaos

Zhao

et al. 2007

Combustion Science and Technology

196

View full text Add to dashboard Cite

show abstract

“…The shock tube data obtained by (Snyder, Robertson et al 1965;Bhaskaran, Gupta et al 1973;Slack 1977;Blumenthal, Fieweger et al 1996;Wang, Olivier et al 2003), also exhibit an activation energy transition as a function of pressure and temperature. Quantitatively, the shock tube data and simulation are in agreement in the high-temperature (17 kcal/mol activation energy) region.…”

Section: Autoignitionmentioning

confidence: 99%

“…iv | P a g e Figure 19: Effect of initial mixture temperature on flashback and blow off velocity gradients for propane-air flames in tubes (Dugger 1955 Peschke and Spadaccini (1985) and Santoro et al (2009), and the Shock Tube Results of Snyder et al (1965), Blumenthal et al (1996), Slack (1977), and Wang (2003) …”

Section: Uci Combustion Laboratorymentioning

confidence: 99%

“…The ignition delay times from various researchers using flow reactors and shock tubes are shown in Figure 63 (Snyder, Robertson et al 1965;Peschke and Spadaccini 1985;Blumenthal, Fieweger et al 1996;Wang, Olivier et al 2003;Beerer and McDonell 2008;Santoro 2009). Peschke and Spadaccini, as well as Santoro, used flow reactors, while the other investigations used shock tubes.…”

Section: Autoignitionmentioning

confidence: 99%

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Fuel Flexible Turbine System (FFTS) Program

None¹

2012

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Analysis of mild ignition in a shock tube using a highly resolved 3D-LES and high-order shock-capturing schemes

2018

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Gas Dynamic Features of Self Ignition of Non Diluted Fuel/Air Mixtures at High Pressure

Cited by 7 publications

References 9 publications

Spontaneous Ignition of Pressurized Releases of Hydrogen and Natural Gas Into Air

Spontaneous Ignition of Pressurized Releases of Hydrogen and Natural Gas Into Air

Fuel Flexible Turbine System (FFTS) Program

Analysis of mild ignition in a shock tube using a highly resolved 3D-LES and high-order shock-capturing schemes

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