Laminar burning speed measurement of premixed n-decane/air mixtures using spherically expanding flames at high temperatures and pressures

Moghaddas, Ali; Eisazadeh-Far, Kian; Metghalchi, Hameed

doi:10.1016/j.combustflame.2011.12.005

Cited by 63 publications

(25 citation statements)

References 40 publications

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“…Typically a radius of ~4 cm is required for stretch to be considered negligible [2,21], Flame stretch is caused by the variation of flame area over time. For spherically expanding flames stretch rate can be defined as ]_dA_2dr A dt r dt (8) where k is the stretch rate, A is the area of flame, t is time, and r is the flame radius.…”

Section: Resultsmentioning

confidence: 99%

“…Laminar burning speed is one of the fundamental thermophysi cal properties of any fuel/air mixture and is defined as the speed relative to the unbumed gas at which a planar, one-dimensional flame front travels along the normal to its surface [2], In the past works on ignition engines, it was assumed that the rate at which a mixture of fuel/air burned was controlled significantly by turbu lent burning speed [3], Then the analyses carried out in connection with efforts to improve the efficiency and pollution characteristics of automotive engines showed that laminar burning speed plays an essential role in determining several important aspects of the combustion process in spark ignition engines. Among these are ignition delay [4], effect of wall quenching layers [5], and mini mum ignition energy [6].…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Rokni

Moghaddas

Askari

et al. 2014

Journal of Energy Resources Technology

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Laminar burning speeds and flame structures of spherically expanding flames of mixtures o f acetylene (C2H2) with air have been investigated over a wide range of equivalence ratios, temperatures, and pressures. Experiments have been conducted in a constant vol ume cylindrical vessel with two large end windows. The vessel was installed in a shadow graph system equipped with a high speed CMOS camera, capable of taking pictures up to 40,000 frames per second. Shadowgraphy was used to study flame structures and transi tion from smooth to cellular flames during flame propagation. Pressure measurements have been done using a pressure transducer during the combustion process. Laminar burning speeds were measured using a thermodynamic model employing the dynamic pressure rise during the flame propagation. Burning speeds were measured for tempera ture range o f300-590 K and pressure range of 0.5-3.3 atm, and the range of equivalence ratios covered from 0.6 to 2. The measured values of burning speeds compared well with existing data and extended for a wider range of temperatures. Burning speed measure ments have only been reported for smooth and laminar flames.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Rokni

Moghaddas

Askari

et al. 2014

Journal of Energy Resources Technology

Self Cite

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“…Stretch can affect the laminar burning speed values. Typically a radius of ~ 4 cm is required for stretch to be considered negligible [2,17]. Flame stretch is caused by the variation of flame area over time.…”

Section: Stretch Effectsmentioning

confidence: 99%

“…Laminar burning speed is one of the fundamental thermo-physical properties of any fuel/air mixture and is defined as the speed relative to the unburned gas at which a planar, onedimensional flame front travels along the normal to its surface [2]. Some researchers have studied laminar burning speeds of different C 2 H 2 /air mixtures.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Rokni

Moghaddas

Askari

et al. 2014

Volume 2: Economic, Environmental, and Policy Aspects of Alternate Energy; Fuels and Infrastructure, Biofuels and Energy Storag

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Laminar burning speeds and flame structures of spherically expanding flames of mixtures of acetylene (C2H2) with air have been investigated over a wide range of equivalence ratios, temperatures, and pressures. Experiments have been conducted in a constant volume cylindrical vessel with two large end windows. The vessel was installed in a shadowgraph system equipped with a high speed CMOS camera, capable of taking pictures up to 40,000 frames per second. Shadowgraphy was used to study flame structures and transition from smooth to cellular flames during flame propagation. Pressure measurements have been done using a pressure transducer during the combustion process. Laminar burning speeds were measured using a thermodynamic model employing the dynamic pressure rise during the flame propagation. Burning speeds were measured for temperature range of 300 to 590 K and pressure range of 0.5 to 3.3 atmospheres, and the range of equivalence ratios covered from 0.6 to 2. The measured values of burning speeds compared well with existing data and extended for a wider range of temperatures. Burning speed measurements have only been reported for smooth and laminar flames.

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“…However, this error becomes insignificant when special tube material is used such as quartz glass or plastic [9,15]. Laminar flame speeds have been extensively studied for a large number of liquid and gaseous fuels [16][17][18][19][20][21][22][23][24], In addition, a considerable attention has been given to measure SL of some alternative gaseous fuel mixtures such as bio gas, which consists mainly of methane (CH4) and carbon dioxide (C 02) [25,26]. However, using biogas as a fuel in combustion engines has many disadvantages such as low rate of heat release, inadequate lean-burn capability, and poor combustion stability.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Laminar Flame Speeds of Alternative Gaseous Fuel Mixtures

Ibrahim

Ahmed

2015

Journal of Energy Resources Technology

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Global warming and the ever increasing emission levels o f combustion engines have forced the engine manufacturers to look fo r alternative fuels fo r high engine performance and low emissions. Gaseous fuel mixtures such as biogas, syngas, and liquefied petroleum gas (LPG) are new alternative fuels that have great potential to be used with combustion engines. In the present work, laminar flame speeds (S ,j o f alternative fuel mixtures, mainly LPG (60% butane, 20% isobutane, and 20% propane) and methane have been studies using the tube method at ambient conditions. In addition, the effect o f adding other fuels and gases such as hydrogen, oxygen, carbon dioxide, and nitrogen on SL has also been investigated. The results show that any change in the fuel mixture composition directly affects S,_. Measurements ofSL o f CHflLPG-air mixtures have found to be about 56cm/s at 0 = 1.1 with 60% LPG in the mixture, which is higher than SL o f both pure fuels at the same 0. Moreover, the addition ofH2 and 0 2 to the fuel mixtures increases SL notably, while the addition o f C 0 2IN2 mixture to the fuel mixture, to simulate the EGR effect, decreases SL o f CHflLPG-air mixtures.

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Laminar burning speed measurement of premixed n-decane/air mixtures using spherically expanding flames at high temperatures and pressures

Cited by 63 publications

References 40 publications

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

Measurements of Laminar Flame Speeds of Alternative Gaseous Fuel Mixtures

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