Analysis of the behaviour of a 4-stroke Si engine fuelled with ammonia and hydrogen

Frigo, Stefano; Gentili, Roberto

doi:10.1016/j.ijhydene.2012.10.114

Cited by 301 publications

(113 citation statements)

References 14 publications

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“…In order to improve the lower combustion intensities of ammonia, hydrogen-added ammonia flames have been studied [3][4][5][6][7]. Lee et al [3,4] experimentally investigated the laminar burning velocity of hydrogen-added ammonia/air premixed flames.…”

Section: Introductionmentioning

confidence: 99%

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Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures

Hayakawa

Goto

Mimoto

et al. 2015

Fuel

524

210

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h i g h l i g h t sLaminar burning velocities of ammonia/air flames at high pressures are evaluated. Maximum value of laminar burning velocity of ammonia/air flame is about 7 cm/s. Laminar burning velocity decreases with the increase in the pressure. Markstein length increases with the increase in equivalence ratio. Markstein lengths at high pressure are lower than those at 0.1 MPa. a b s t r a c tAmmonia is expected to be useful not only as a hydrogen-energy carrier but also as a carbon-free fuel. In order to design an ammonia fueled combustor, fundamental flame characteristics of ammonia must be understood. However, knowledge of the characteristics of ammonia/air flames, especially at the high pressures, has been insufficient. In this study, the unstretched laminar burning velocity and the Markstein length of ammonia/air premixed flames at various pressures up to 0.5 MPa were experimentally clarified for the first time. Spherically propagating premixed flames, which propagate in a constant volume combustion chamber, were observed using high-speed schlieren photography. Results indicate that the maximum value of unstretched laminar burning velocities is less than 7 cm/s within the examined conditions and is lower than those of hydrocarbon flames. The unstretched laminar burning velocity decreases with the increase in the initial mixture pressure, tendency being the same as that of hydrocarbon flames. The burned gas Markstein length increases with the increase in the equivalence ratio, the tendency being the same as that of hydrogen/air flames and methane/air flames. The burned gas Markstein lengths at 0.1 MPa are higher than those at 0.3 MPa and 0.5 MPa. However, the values of burned gas Markstein length at 0.3 MPa and 0.5 MPa are almost the same. In addition, numerical simulations using CHEMKIN-PRO with five detailed reaction mechanisms which are presently applicable for the ammonia/air combustion were also conducted. However, qualitative predictions of unstretched laminar burning velocity using those reaction mechanisms are inaccurate. Thus, further improvements of reaction mechanisms are essential for application of ammonia/air premixed flames.

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Section: Introductionmentioning

confidence: 99%

“…The application of ammonia in an actual combustor is also being studied. Frigo et al [6,7] applied hydrogen-doped ammonia as a fuel for the spark ignition engines. The power and thermal efficiencies of a hydrogen-doped ammonia fielded engine were compared with those of a gasoline engine.…”

Section: Introductionmentioning

confidence: 99%

Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures

Hayakawa

Goto

Mimoto

et al. 2015

Fuel

524

210

View full text Add to dashboard Cite

show abstract

“…Dual ammonia-diesel fuel systems for CI engines and ammonia-gasoline fuel systems for SI engines have been studied in the literature extensively [6][7][8][9][10]. These studies use methods such as dual fuel storage systems which inject ammonia in to the combustion chamber at the point of injection or on-board catalytic reforming of hydrogen from ammonia.…”

Section: Abstract: Ammonia When Blended With Hydro Carbon Fuels Canmentioning

confidence: 99%

Ammonia and gasoline composite liquid fuel blends emulsified with ethanol and methanol for direct displacement in internal combustion engines

Haputhanthri¹,

Austin²,

Maxwell³

et al. 2014

IOSRJMCE

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“…%, or equivalently 8 vol. % H 2 /NH 3 ), were found to be effective to speed combustion up allowing satisfactory engine running [8].…”

Section: Introductionmentioning

confidence: 99%

“…using the combusted gases exhausted by the engine). In a previous paper [8] the possibility to fuel a small 4-stroke twin-cylinder SI engine of 505 cm 3 with a mixture of ammonia and a small amount of hydrogen was demonstrated. In that activity the ammonia and hydrogen utilized came from pressurized tanks.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen generation system for ammonia–hydrogen fuelled internal combustion engines

Comotti¹,

Frigo

2015

International Journal of Hydrogen Energy

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228

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Analysis of the behaviour of a 4-stroke Si engine fuelled with ammonia and hydrogen

Cited by 301 publications

References 14 publications

Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures

Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures

Ammonia and gasoline composite liquid fuel blends emulsified with ethanol and methanol for direct displacement in internal combustion engines

Hydrogen generation system for ammonia–hydrogen fuelled internal combustion engines

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