Experimental and modeling study of chemical-kinetics mechanisms for H2–NH3–air mixtures in laminar premixed jet flames

Kumar, Praveen; Meyer, Terrence R.

doi:10.1016/j.fuel.2012.06.103

Cited by 233 publications

(70 citation statements)

References 24 publications

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“…Although some of these reactions take the ammonia reaction into consideration and are used in the study of ammonia/hydrogen/air flames [5], they have not been optimized for the ammonia/air combustion. The detailed chemical kinetics of Tian's mechanism [12] was developed based on NH 3 /CH 4 /O 2 /Ar flame at a reduced pressure condition in order to identify the detailed flame structure using tunable synchrotron vacuum ultraviolet photoionization and molecular-beam mass spectrometry.…”

Section: Unstretched Laminar Burning Velocity and Markstein Lengthmentioning

confidence: 99%

“…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%

“…They showed the laminar burning velocity and Markstein numbers at the atmospheric pressure and clarified that the laminar burning velocity increases and the Markstein number decreases with an increase in hydrogen concentration. Kumar and Meyer [5] showed the laminar burning velocity of hydrogen/ammonia/air flames by considering the heat loss from the flames. The application of ammonia in an actual combustor is also being studied.…”

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

558

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: Unstretched Laminar Burning Velocity and Markstein Lengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

558

210

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“…Parallel to experimental investigations, a number of numerical studies have been dedicated to predict the ammonia combustion process. The structure of ammonia-air flames and partially cracked ammonia-air flames has also been the subject of several studies in the past [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of combustion characteristics of ammonia as a renewable fuel and establishment of reduced reaction mechanisms

Nozari

Karabeyoğlu

2015

Fuel

132

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“…近年，欧米をはじめとする諸外国を中心にアンモニアを代替燃料とするための研究が行われている (Zamfirescu and Dincer, 2008, Takizawa et al, 2008, Ronny, 1988, Kumar and Meyer, 2013, Duynslaegher et al, 2009, Duynslaegher et al, 2010, Pfahl et al, 2000, Li et al, 2014, Hayakawa et al, 2015a, Hayakawa et al, 2015b, Ichikawa et al, 2015, 武石他, 2015, 武石他, 2016, 小林, 早川, 2016, 小池他, 2016, 武石他, 2017 (水谷, 矢野, 1978, Chung and Lee, 1991, Takahashi and Schmoll, 1990, 小谷他, 2004, Otakeyama et al, 2009 …”

Section: 緒言unclassified

Study on flame stability in oxygen-enriched ammonia/N<sub>2</sub>/O<sub>2</sub> laminar diffusion flame

Ishikawa

Hayashi

Takeishi

et al. 2018

Transactions of the JSME (In Japanese)

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Ammonia is regarded as one of the alternative fuels because CO 2 is not emitted during the combustion process of ammonia. The physical properties of ammonia are suitable for transportation and storage as a "hydrogen carrier". Also, a large amount of ammonia can be easily produced through the Haber-Bosch process with low price. To use ammonia as a fuel, it is necessary to understand the fundamental combustion characteristics of ammonia. Flammability of ammonia coaxial jet diffusion flame is important to know for developing the industrial furnace. Ammonia laminar diffusion flame is difficult to be stable under atmospheric oxidizer (O 2 21%) of room temperature. In this study, therefore, the oxygen-enriched combustion is applied to make the stable ammonia laminar diffusion flame. In this study, effects of the fuel velocity and the oxidizer velocity on the ammonia laminar diffusion flame are investigated in detail under the conditions of O 2 volume fraction of 24% and 25% at the burner rim thickness of 6.0 mm. Results showed that there were three regions with different extinction mechanism of the ammonia coaxial jet diffusion flame under the relatively higher fuel velocity. Particularly, the flame extinction also occurred under the low fuel velocity under the condition of O 2 volume fraction of 24%.Keywords : Renewable energy, Ammonia fuel, Alternative fuel, Carbon free fuel, Oxygen-enriched combustion, Flame stabilization 1. 緒言 and Dincer, 2008, Takizawa et al., 2008, Ronny, 1988, Kumar and Meyer, 2013, Duynslaegher et al., 2009, Duynslaegher et al., 2010, Pfahl et al., 2000, Li et al., 2014, Hayakawa et al., 2015a, Hayakawa et al., 2015b, Ichikawa et al., 2015, 武石他, 2015, 武石他, 2016, 小林, 早川, 2016, 小池他, 2016, 武石他, 2017 Duynslaegher, C., Jeanmart, H. and Vandooren, J., Flame structure studies of premixed ammonia/hydrogen/oxygen/argon flames: experimental and numerical investigation, 近年，欧米をはじめとする諸外国を中心にアンモニアを代替燃料とするための研究が行われている(Zamfirescu

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Experimental and modeling study of chemical-kinetics mechanisms for H2–NH3–air mixtures in laminar premixed jet flames

Cited by 233 publications

References 24 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

Numerical study of combustion characteristics of ammonia as a renewable fuel and establishment of reduced reaction mechanisms

Study on flame stability in oxygen-enriched ammonia/N<sub>2</sub>/O<sub>2</sub> laminar diffusion flame

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