The constant-volume propagating spherical flame method for laminar flame speed measurement

Faghih, Mahdi; Chen, Zheng

doi:10.1007/s11434-016-1143-6

Cited by 88 publications

(48 citation statements)

References 98 publications

(271 reference statements)

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“…The present experimental approach employs outwardly propagating spherical flames in a constant volume device with S u calculated from the measured pressure rise and a thermodynamic flame model (e.g., [5–10]). Other methods used with refrigerants include: flame propagation in a vertical tube [11, 12]; constant pressure method outwardly propagating spherical flames (e.g., [13, 14]); and steady flow, nozzle-stabilized flames (e.g., [15]).…”

Section: Introductionmentioning

confidence: 99%

Effects of stretch and thermal radiation on difluoromethane/air burning velocity measurements in constant volume spherically expanding flames

Burrell

Pagliaro

Linteris

2019

Proceedings of the Combustion Institute

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Compared to current refrigerants, next-generation refrigerants are more environmentally benign but more flammable. The laminar burning velocity is being used by industry as a metric to screen refrigerants for fire risk, and it is also used for kinetic model development and validation. This study reports measurements of difluoromethane/air flame burning velocities for equivalence ratios from 0.9 to 1.4 in a spherical, constant volume device. Experimental burning velocities produced with the aid of an optically thin radiation model are about 17 % greater than those obtained with an adiabatic model. Characterization of flame stretch based on the product of Markstein and Karlovitz numbers indicates that while many experimental data are nearly stretch-free, those for slower burning velocities, smaller flame radii, and leaner conditions may not be. Limiting the data to regions estimated to be stretch-free requires extrapolation away from the experimental conditions to extract burning velocities near ambient conditions, e.g., at (298 K, 101 kPa). Lower uncertainty, desirable for kinetic model validation, is obtained by interpolating between experimental conditions, e.g., at (400 K, 304 kPa). Since thermal radiation and flame stretch were found to affect the inferred burning velocities of difluoromethane/air constant volume spherical flames, they should also be considered during data reduction of other mildly flammable refrigerants.

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Section: Introductionmentioning

confidence: 99%

Effects of stretch and thermal radiation on difluoromethane/air burning velocity measurements in constant volume spherically expanding flames

Burrell

Pagliaro

Linteris

2019

Proceedings of the Combustion Institute

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“…One-dimensional spherical flame propagation in a closed chamber is considered. The constant-volume propagating spherical flame method (Faghih and Chen, 2016) is used to calculate the LFS. It has the advantage in obtaining the LFS at a broad range of temperature and pressure under enginerelevant conditions (Faghih and Chen, 2016).…”

Section: Methodsology Numerical Setupmentioning

confidence: 99%

“…The constant-volume propagating spherical flame method (Faghih and Chen, 2016) is used to calculate the LFS. It has the advantage in obtaining the LFS at a broad range of temperature and pressure under enginerelevant conditions (Faghih and Chen, 2016). In this method, the flame is center-ignited inside a closed spherical chamber and then the pressure rise during spherical flame propagating is recorded.…”

Section: Methodsology Numerical Setupmentioning

confidence: 99%

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Laminar Flame Speed of Methane/Air at Engine-Relevant Conditions: Performance of Different Mechanisms

Wang¹,

Su²,

Chen³

2019

Proceedings of Global Power &Amp; Propulsion Society

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Laminar flame speed (LFS) is used as an important input in certain turbulent premixed combustion modelling for spark ignition engines. At engine-relevant temperatures and pressures, the LFS is difficult to be measured and it is usually obtained from calculations using detailed or reduced chemical mechanisms. However, at very high temperature in the range of 700~1000 K, it is difficult to get the converged solutions during LFS calculation. In this study, the LFS at enginerelevant conditions are obtained from simulating propagating spherical CH 4 /air flames in a closed spherical vessel. The results from different chemical mechanisms are obtained and compared. It is found that there is significant difference between the LFSs predicted from different chemical mechanisms, especially at high temperatures and pressures. It is also shown that the reduced mechanism has very good performance in terms of predicting the LFS at engine-relevant conditions. Besides, the performance of difference chemical mechanisms in terms of predicting the ignition delay time and the excitation time is assessed and significant difference is also observed.

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“…A good overview of different approaches to determine the laminar flame propagation speed in a spherical, closed volume that can be found in the paper by Faghih and Chen [27].…”

Section: Flame Propagation In a Closed Volumementioning

confidence: 99%

Experimental Investigation of the Flame Propagation and Flashback Behavior of a Green Propellant Consisting of N2O and C2H4

Werling¹,

Lauck²,

Freudenmann³

et al. 2017

JEPE

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Regarding the research on alternatives for monopropellant hydrazine, several so called green propellants are currently under investigation or qualification. Aside others, the DLR Institute of Space Propulsion investigates a N 2 O/C 2 H 4 premixed green propellant. During the research activities, flashback from the rocket combustion chamber into the feeding system has been identified as a major challenge when using the propellant mixture. This paper shows the results of ignition experiments conducted in a cylindrical, optical accessible ignition chamber. During the ignition and flame propagation process, pressure, temperature and high-speed video data were collected. The high speed video data were used to analyze the flame propagation speed. The obtained propagation speed was about 20 m/s at ignition, while during further propagation of the flame speeds of up to 120 m/s were measured. Additionally, two different porous materials as flame arresting elements were tested: Porous stainless steel and porous bronze material. For both materials Peclet numbers for flashback were derived. The critical Peclet number for the sintered bronze material was around 20, while for the sintered stainless steel the critical Peclet number seems to be larger than 40. Due to the test results, sintered porous materials seem to be suitable as flashback arresters.

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The constant-volume propagating spherical flame method for laminar flame speed measurement

Cited by 88 publications

References 98 publications

Effects of stretch and thermal radiation on difluoromethane/air burning velocity measurements in constant volume spherically expanding flames

Effects of stretch and thermal radiation on difluoromethane/air burning velocity measurements in constant volume spherically expanding flames

Laminar Flame Speed of Methane/Air at Engine-Relevant Conditions: Performance of Different Mechanisms

Experimental Investigation of the Flame Propagation and Flashback Behavior of a Green Propellant Consisting of N2O and C2H4

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