Effects of Pressure on Burning Velocity and Instabilities of Propane-Air Premixed Flames

Kitagawa, Toshiaki

doi:10.1299/jsmeb.48.2

Cited by 20 publications

(5 citation statements)

References 25 publications

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“…In this study, this state is defined as the instant of transition to cellularity. This critical instant is almost consistent with the timing at the onset of cellular flame acceleration [49]. The flame radius of this state is defined as the critical flame radius, and the critical Peclet number (Pe c ) is the critical radius normalized by the laminar flame thickness of the mixtures.…”

Section: Flame Instabilitysupporting

confidence: 61%

Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures

Huang

Wang

et al. 2011

Combustion and Flame

120

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Section: Flame Instabilitysupporting

confidence: 61%

Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures

Huang

Wang

et al. 2011

Combustion and Flame

120

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“…Cheung et al [62] studied the influence of DMC/diesel (4.5%, 9.1%, 13.8%, and 18.6% by volume) on the gaseous and particulate emissions. The experiment was conducted on a water-cooled, four-cylinder, direct injection engine, operating at five torques: 28,70,130,190, and 240 Nm. They found that particulate mass concentration and particle number concentration of soot significantly reduced, as shown in Figure 5.…”

Section: The Use Of Dmc/diesel Blends To Fuel Diesel Enginesmentioning

confidence: 99%

“…The Markstein length refers to the burning velocity, therefore, flame stability. A negative Markstein length means the flame is unstable, and the diffusional thermal effect is considerable on the flame front, whilst a positive Markstein length indicates the flame is stable because of diffusional thermal effect [70]. The critical Peclet number can be described as the critical radius normalized by the laminar flame thickness of the mixture [71].…”

Section: Laminar Burning Characteristics Of Dmcmentioning

confidence: 99%

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

Abdalla

Liu

2018

Energies

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Energy shortage and environmental problems are two dominant subjects. Dimethyl carbonate (DMC) is one of the oxygenated fuels with increasing interest as the alternative to diesel fuel or additive for conventional hydrocarbon fuels. In the last decade, comprehensive studies on DMC have been carried out in terms of synthesis, use, and oxidation and combustion mechanism. DMC synthesis from greenhouse gas such as carbon dioxide can achieve the carbon circulation between air and fuel. Ethylene carbonate route is one of the most promising ways to utilize carbon dioxide and synthesize DMC in terms of particle efficiency, energy consumption per one unit of product, and net carbon dioxide emission. In addition, the results show that pure DMC in compression ignition (CI) engines or DMC addition in diesel/gasoline could decrease emissions significantly. Moreover, DMC pyrolysis form carbon dioxide before carbon monoxide which is different from other oxygenated fuels. However, DMC can produce formaldehyde during oxidation process in high concentration, which is harmful to the environment and human health as well. The present DMC kinetic model needs to update the major reactions constant through recognizing the initial decomposition routes and low-temperature oxidation. In addition, further studies on the DMC/hydrocarbon fuels mixtures for the interaction chemistry are needed.

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“…Although these values are important for laminar flame characteristics, such as flame instability [21], turbulent flame characteristics are also affected by the Markstein length or the Markstein number. Hayakawa et al [18] investigated the turbulent burning velocity at fixed turbulence Karlovitz numbers and showed that the ratio of turbulent burning velocity to unstretched laminar burning velocity increases with a decrease in Markstein number.…”

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

560

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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Effects of Pressure on Burning Velocity and Instabilities of Propane-Air Premixed Flames

Cited by 20 publications

References 25 publications

Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures

Laminar burning velocities and flame instabilities of 2,5-dimethylfuran–air mixtures at elevated pressures

Dimethyl Carbonate as a Promising Oxygenated Fuel for Combustion: A Review

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

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