An Experimental Study on Local Flame Displacement Velocity of Hydrogen added Propane Premixed Turbulent Flames

Nakahara, Masaru; Hashimoto, Jun; Shirasuna, Takamori; Tsukikawa, Masayoshi

doi:10.1299/jee.6.700

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…In Table 1, denotes the total equivalence ratio (Nakahara et al, 2011b) based on the numbers of carbon and hydrogen atoms of two fuels (0.5~1.4, where 0.5 is the equivalence ratio below a lean flammability limit of propane-air mixtures).  H represents the rate of addition of the volume fraction of hydrogen in the total gaseous fuels ( H =0~1.0).…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Besides, S L0 is the burning velocity whose flame radius is more than approximately 15 mm. It is calculated by pressure history in the combustion chamber for the unstretched spherical laminar flames (Kido et al, 2002;Nakahara et al, 2011aNakahara et al, , 2011bNakahara et al, , 2013Nakahara et al, , 2015.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…The experiments in turbulence are conducted according to the same procedure in quiescence. For the experiment, however, approximately isotropic and homogeneous turbulence in the central region of the chamber (Kido et al, 2002;Nakahara et al, 2011b) could be generated by rotating both installed fans at the same rotational speed of 1000 and 5000 rpm, that is, the turbulence intensity u'=0.35 and 1.76 m/s. Finally, MIE of each mixture was determined for each u'.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

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Effects of hydrogen addition and turbulence on ignition and meso-scale flames of propane mixtures

Nakahara

Tanimoto

Kudo

et al. 2022

JTST

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This study has investigated experimentally the effects of hydrogen addition and turbulence on the ignition and the flame-kernel development characteristics in isotropic and homogeneous turbulence for propane mixtures. In this study, the lean-and rich-fueled hydrogen added propane mixtures with different equivalence ratios (=0.5~1.4) and hydrogen additional rates ( H =0.0~1.0) are prepared, while maintaining the laminar burning velocity (S L0 =25 or 15 cm/s). First, in order to investigate the ignition and flame-kernel development in quiescence, the minimum ignition energy Ei min and the relationship between the flame radius and the burning velocity of meso-scale laminar flames in the range of flame radii r f approximately from 1 to 5 mm are examined quantitatively by using sequential schlieren photography in a constant volume vessel. Then, the experiments in isotropic and homogeneous turbulence are carried out for two turbulence level with the turbulence intensity u' being approximately 0.35 and 1.76 m/s. Ei min for each mixture is also defined experimentally at each u'. It is found that the effects of hydrogen addition and turbulence on the ignition and the burning velocity of meso-scale flame characteristics are much different between the lean and the rich hydrogen added propane mixtures. It also becomes clear that there is a good relationship between Ei min characteristics in turbulence and Lewis number or the Markstein number. Additionally, the transition region of the minimum ignition energy could be summarized regardless of ,  H and u'/S L0 by using the proposed turbulent Karlovitz number based on the burning velocity of the meso-scale flame in quiescence.

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Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of hydrogen addition and turbulence on ignition and meso-scale flames of propane mixtures

Nakahara

Tanimoto

Kudo

et al. 2022

JTST

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Validation of a new level set approach in the counter flow premixed flame

Liu

Oshima

2014

JTST

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Study on Influences of Hydrogen addition and Turbulence on Ignition Characteristics of Hydrocarbon Mixtures

Nakahara,

Matsushita,

Kishiura

et al. 2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">This study is performed to experimentally examine the effects of hydrogen addition and turbulence on the ignition and the flame-kernel development characteristics in isotropic and homogeneous turbulence for methane or propane mixtures. First, in order to investigate the ignition and flame-kernel development in quiescence, the minimum ignition energy MIE and the relationship between the flame radius and the burning velocity of meso-scale laminar flames are examined by using sequential schlieren photography in a constant volume vessel. Then, the properties of MIE are examined for three turbulence level. Additionally, the transition region of MIE could be summarized by using the proposed turbulent Karlovitz number based on the burning velocity of the meso-scale flame in quiescence.</div></div>

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An Experimental Study on Local Flame Displacement Velocity of Hydrogen added Propane Premixed Turbulent Flames

Cited by 3 publications

References 17 publications

Effects of hydrogen addition and turbulence on ignition and meso-scale flames of propane mixtures

Effects of hydrogen addition and turbulence on ignition and meso-scale flames of propane mixtures

Validation of a new level set approach in the counter flow premixed flame

Study on Influences of Hydrogen addition and Turbulence on Ignition Characteristics of Hydrocarbon Mixtures

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