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Journal articles on the topic 'Spherical flame propagation'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Joo, S. H., K. M. Chun, Y. Shin, and K. C. Lee. "An Investigation of Flame Expansion Speed With a Strong Swirl Motion Using High-Speed Visualization." Journal of Engineering for Gas Turbines and Power 125, no. 2 (2003): 485–93. http://dx.doi.org/10.1115/1.1564067.

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In this study, a simple linear supposition method is proposed to separate the flame expansion speed and swirl motion of a flame propagating in an engine cylinder. Two series of images of flames propagating in the cylinder with/without swirl motion were taken by a high frame rate digital video camera. A small tube (4 mm ID) was installed inside the intake port to deliver the fuel/air mixture with strong swirl motion into the cylinder. An LDV was employed to measure the swirl motion during the compression stroke. Under the assumption that flame propagates spherically from the each point of the f

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2

Mitu, Maria, Venera Giurcan, Codina Movileanu, Domnina Razus, and Dumitru Oancea. "Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel." Processes 9, no. 5 (2021): 851. http://dx.doi.org/10.3390/pr9050851.

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Flammable fuel-N2O mixtures raise safety and environmental protection issues in areas where these mixtures are used (such as: industry, research, internal combustion engines). Therefore, it is important to know their laminar combustion velocities and propagation speeds—important safety parameters for design of active protection devices against gas explosions and corresponding safety recommendations. In this paper, the laminar combustion velocities of N2-diluted CH4-N2O flames, obtained in experiments on outwardly propagating flames, at various initial pressures (within 0.5–2.0 bar) and room te

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3

Parsinejad, Farzan, Matyas Matlo, and Mohamad Metghalchi. "A Mathematical Model for Schlieren and Shadowgraph Images of Transient Expanding Spherical Thin Flames." Journal of Engineering for Gas Turbines and Power 126, no. 2 (2004): 241–47. http://dx.doi.org/10.1115/1.1688368.

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Optical behavior of spherical flames is investigated using both Schlieren and shadowgraph methods. A mathematical model has been developed to predict the intensity of refracted light beams interacting with a transient expanding thin flame. Experimental facilities have been built to visualize transient expanding spherical flames. The facilities include a cylindrical chamber with two end glasses for optical observation. Shadowgraph and Schlieren pictures of flame propagation have been taken using a high-speed charged coupled device camera. Experimental results are in very good agreement with tho

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4

Haq, M. Z. "Correlations for the Onset of Instabilities of Spherical Laminar Premixed Flames." Journal of Heat Transfer 127, no. 12 (2005): 1410–15. http://dx.doi.org/10.1115/1.2098867.

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A spherically expanding flame in a quiescent premixture is a bifurcation phenomenon, in which the flame becomes unstable at a radius, greater than some critical value, while remaining stable below that critical radius. Beyond this critical radius, developing instabilities are initiated by propagating cracks to form a coherent structure covering the entire flame surface and the flame accelerates. The present paper reports a Schlieren photographic study of spherical flame propagation in methane—air, iso-octane—air and n-heptane—air premixtures at different initial conditions where the onset of i

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5

Kelley, Andrew P., John K. Bechtold, and Chung K. Law. "Premixed flame propagation in a confining vessel with weak pressure rise." Journal of Fluid Mechanics 691 (December 2, 2011): 26–51. http://dx.doi.org/10.1017/jfm.2011.439.

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AbstractThe propagation of a premixed flame inside of a confining vessel filled with combustible fluid is determined using large-activation-energy asymptotics. The flame structure is analysed assuming that spatial and temporal variations in the transverse direction are weak compared to those in the direction normal to the flame surface. The analysis considers weak pressure rise from confinement and also allows for mixtures that are both near and removed from stoichiometry, non-unity reaction orders, temperature-dependent transport coefficients, and general Lewis numbers. The resulting equation

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6

Almyali, Hussein M., Zaid M. H. Al Dulaimi, and Mohammed A. Al-Fahham. "A Review: Flame Propagation Dynamics in Open Tubes: Factors Influencing Combustion Conditions and Practical Implementations." Salud, Ciencia y Tecnología - Serie de Conferencias 3 (May 31, 2024): 816. http://dx.doi.org/10.56294/sctconf2024816.

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This study examines the combustion conditions of fuel flame propagation within a tube of uniform cross-sectional area, where ignition occurs at the sealed end and the flame propagates in the direction of both the open and sealed ends. Both factors exert an influence on the configuration and functioning of combustion systems. To gain a comprehensive understanding of the impact of practical implementations in various combustion systems, it is imperative to comprehend the variations in flame propagation stages as a result of thermodynamic conditions. The operational conditions involving pressures

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7

Pan, Jiaying, Yu He, Tao Li, Haiqiao Wei, Lei Wang, and Gequn Shu. "Effect of Temperature Conditions on Flame Evolutions of Turbulent Jet Ignition." Energies 14, no. 8 (2021): 2226. http://dx.doi.org/10.3390/en14082226.

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Turbulent jet ignition technology can significantly improve lean combustion stability and suppress engine knocking. However, the narrow jet channel between the pre-chamber and the main chamber leads to some difficulties in heat exchange, which significantly affects combustion performance and mechanical component lifetime. To clarify the effect of temperature conditions on combustion evolutions of turbulent jet ignition, direct numerical simulations with detailed chemical kinetics were employed under engine-relevant conditions. The flame propagation in the pre-chamber and the early-stage turbul

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8

Yu, Yangyang, Lehai Liu, Junhong Zhang, Jun Wang, Xiangde Meng, and Dan Wang. "Explosion-Suppression Characteristics of Nonmetallic Spherical Spacers on Propane-Air Mixtures in Confined Space." Applied Sciences 11, no. 19 (2021): 9238. http://dx.doi.org/10.3390/app11199238.

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The explosion-suppression effects of NSSs on overpressures, flame propagation and flame tip velocities were explored under the initial pressures of 0.2 MPa, 0.3 MPa and 0.4 MPa. All experiments tested in a constant volume combustion bomb (CVCB). Explosion reaction of premixed propane–air gas in a new designed CVCB filled with nonmetallic spherical spacers (NSSs) was analyzed. The results showed that overpressures decreased under the different initial pressures. With the increase of filling density, the overpressure decreased, the time to reach explosion overpressure decreased, and the decay ra

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9

Giurcan, Venera, Maria Mitu, Codina Movileanu, Domnina Razus, and Dumitru Oancea. "Propagation Velocity of Flames in Inert-Diluted Stoichiometric Propane-Air Mixtures: Pressure and Temperature Dependence." Processes 9, no. 6 (2021): 997. http://dx.doi.org/10.3390/pr9060997.

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The flammable propane–air mixtures raise specific safety and environmental issues in the industry, storage, handling and transportation; therefore dilution of such mixtures has gained significant importance from the viewpoint of fire safety, but also due to nitrogen oxide’s emission control through flameless/mild combustion. In this paper, the propagation of the flame in C3H8-air-diluent stoichiometric gaseous mixtures using Ar, N2 and CO2 as diluents was investigated. Data were collected from dynamic pressure-time records in spherical propagating explosions, centrally ignited. The experiments

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10

Kodakoglu, Furkan, Sinan Demir, Damir Valiev, and V’yacheslav Akkerman. "Analysis of Gaseous and Gaseous-Dusty, Premixed Flame Propagation in Obstructed Passages with Tightly Placed Obstacles." Fluids 5, no. 3 (2020): 115. http://dx.doi.org/10.3390/fluids5030115.

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A recent predictive scenario of premixed flame propagation in unobstructed passages is extended to account for obstructions that can be encountered in facilities dealing with explosive materials such as in coalmines. Specifically, the theory of globally-spherical, self-accelerating premixed expanding flames and that of flame acceleration in obstructed conduits are combined to form a new analytical formulation. The coalmining configuration is imitated by two-dimensional and cylindrical passages of high aspect ratio, with a comb-shaped array of tightly placed obstacles attached to the walls. It

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11

Volodin, V. V., V. V. Golub, A. E. Elyanov, A. E. Korobov, A. Yu Mikushkin, and V. A. Petukhov. "Effects of Hydrogen-Air Gas Mixture Volume and Initiation Type and Energy on the Propagation of a Spherical Flame Front." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 83 (2019): 64–80. http://dx.doi.org/10.18698/1812-3368-2019-2-64-80.

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The investigation considered a spherical flame front propagating in free space filled with a hydrogen-air mixture containing 15 % hydrogen. The experiments were conducted inside latex shells. We initiated combustion in the centre of the volume, using either a 1 mJ spark or a nichrome wire explosion releasing 5 J of energy. In the case of the 7 m3 and larger shells, we recorded video data on the flame front using an InfraTec ImageIR 8320 infrared camera featuring a 2.0--5.7 μm spectral ranges and a rate of 300 frames per second. In the case of the 0.003 m3 and smaller shells, we visualised the

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12

Chen, Zheng. "Effects of radiation on large-scale spherical flame propagation." Combustion and Flame 183 (September 2017): 66–74. http://dx.doi.org/10.1016/j.combustflame.2017.04.031.

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13

Giurcan, Venera, Maria Mitu, Domnina Razus, and Dumitru Oancea. "Experimental Study and Kinetic Modeling of Laminar Flame Propagation in Premixed Stoichiometric n-butane-air Mixture." Revista de Chimie 70, no. 4 (2019): 1125–31. http://dx.doi.org/10.37358/rc.19.4.7077.

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The laminar burning velocities and propagation speeds of stoichiometric n-butane-air mixture were obtained for outwardly propagating spherical flames by measurements of pressure rise during the early stage of propagation in a spherical vessel. The experiments were carried out at various initial pressures within 0.3 and 1.2 bar, and various initial temperatures within 298 and 423 K. The experimental laminar burning velocities were compared with those provided by the detailed kinetic modelling based on Warnatz mechanism for combustion of C1-C4 hydrocarbons, using INSFLA package. The baric and th

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14

Liu, Chuang, Guoxun Jing, Yue Sun, and Pengliang Li. "Experimental study of the effect of coal dust on the flame dynamics of partially premixed gas-coal dust explosion in a vertical pressure relief pipeline." Thermal Science, no. 00 (2023): 257. http://dx.doi.org/10.2298/tsci230626257l.

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To further study the gas-coal dust explosion hazards under complex conditions. Experiments were conducted in pipeline systems containing explosive pipeline and pressure relief pipeline. The Effect of coal dust concentration and particle size on the flame dynamics of gas-coal dust explosion was investigated. The flame structure in the explosion pipeline is divided into two stages: spherical and round-finger. In the pressure relief pipeline, the flame structure e varies at working conditions. Flame front position increases with time, showing a class exponential growth trend. The flame front velo

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15

Li, Zehuan, Yulong Duan, Shilin Lei, Ziyang Wen, Lulu Zheng, and Fengying Long. "Flame propagation of premixed gas explosion with different equivalent ratio under corrugated fire-retardant core." Thermal Science, no. 00 (2023): 146. http://dx.doi.org/10.2298/tsci230327146l.

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Based on the self-built experimental setup, the propagation law of explosion flame of hydrogen/methane premixed gas with different hydrogen volume fractions in different equivalent ratios was investigated under the action of a corrugated fire-retardant core. The experimental study shows that the flame isolation and suppression effect of the corrugated fire-retardant core at different equivalence ratios is either promoted or suppressed, the hydrogen/methane premixed gas explosion flame is quenched without hydrogen mixing when ?=0.8and1.0, and also quenched when ?=1.2indifferent hydrogen volume

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16

Wang, Y. X., C. Zheng, J. L. Han, et al. "Ignition sensitivity and flame propagation of titanium powder cloud." Journal of Physics: Conference Series 2478, no. 7 (2023): 072003. http://dx.doi.org/10.1088/1742-6596/2478/7/072003.

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Abstract The ignition sensitivity and flame propagation of titanium dust cloud were investigated to evaluate the risk of combustion and explosion of titanium powder. The minimum ignition temperature(MIT) was determined by Godbert-Greenwald furnace and the minimum ignition energy(MIE) was determined by Hartmann apparatus. The flame propagation behavior in the Hartmann apparatus was recorded by high-speed camera and infrared thermal imager. The results show that the spherical titanium powder with a median diameter of 12.5μm had a minimum ignition temperature of 400°C, a minimum ignition energy o

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17

Er-raiy, Aimad, Radouan Boukharfane, and Matteo Parsani. "Effects of Composition Heterogeneities on Flame Kernel Propagation: A DNS Study." Fluids 5, no. 3 (2020): 152. http://dx.doi.org/10.3390/fluids5030152.

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In this study, a new set of direct numerical simulations is generated and used to examine the influence of mixture composition heterogeneities on the propagation of a premixed iso-octane/air spherical turbulent flame, with a representative chemical description. The dynamic effects of both turbulence and combustion heterogeneities are considered, and their competition is assessed. The results of the turbulent homogeneous case are compared with those of heterogeneous cases which are characterized by multiple stratification length scales and segregation rates in the regime of a wrinkled flame. Th

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18

Mitu, Maria, Codina Movileanu, and Venera Giurcan. "Deflagration Characteristics of N2-Diluted CH4-N2O Mixtures in the Course of the Incipient Stage of Flame Propagation." Energies 14, no. 18 (2021): 5918. http://dx.doi.org/10.3390/en14185918.

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In this study, experimental measurements in a spherical combustion bomb were performed in order to investigate the flame propagation in N2-diluted CH4-N2O mixtures with stoichiometric equivalence ratio, at several initial pressures (0.5–1.75 bar) and ambient initial temperatures. Methane was chosen as a test-fuel, since it is the main component of natural gas, a fuel often used as a substitute to gasoline in engines with internal combustion and industrial plants. The method approached in this study is based on a simple examination of the cubic law of pressure rise during the early (incipient)

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19

Tornatore, Cinzia, and Magnus Sjöberg. "Optical Investigation of a Partial Fuel Stratification Strategy to Stabilize Overall Lean Operation of a DISI Engine Fueled with Gasoline and E30." Energies 14, no. 2 (2021): 396. http://dx.doi.org/10.3390/en14020396.

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This paper offers new insights into a partial fuel stratification (PFS) combustion strategy that has proven to be effective at stabilizing overall lean combustion in direct injection spark ignition engines. To this aim, high spatial and temporal resolution optical diagnostics were applied in an optically accessible engine working in PFS mode for two fuels and two different durations of pilot injection at the time of spark: 210 µs and 330 µs for E30 (gasoline blended with ethanol by 30% volume fraction) and gasoline, respectively. In both conditions, early injections during the intake stroke we

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20

Greenberg, J. Barry. "Propagation of a Spherical Flame through a Polydisperse Fuel Spray." International Journal of Spray and Combustion Dynamics 1, no. 4 (2009): 417–34. http://dx.doi.org/10.1260/175682709789685831.

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21

Greenberg, J. B. "Propagation and extinction of an unsteady spherical spray flame front." Combustion Theory and Modelling 7, no. 1 (2003): 163–74. http://dx.doi.org/10.1088/1364-7830/7/1/309.

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22

Han, Wang, and Zheng Chen. "Effects of Soret diffusion on spherical flame initiation and propagation." International Journal of Heat and Mass Transfer 82 (March 2015): 309–15. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.11.062.

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23

Zhang, Huangwei, and Zheng Chen. "Spherical flame initiation and propagation with thermally sensitive intermediate kinetics." Combustion and Flame 158, no. 8 (2011): 1520–31. http://dx.doi.org/10.1016/j.combustflame.2010.12.031.

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24

Wang, Jinhua, Yongliang Xie, Xiao Cai, Yaohui Nie, Cheng Peng, and Zuohua Huang. "Effect of H2O Addition on the Flame Front Evolution of Syngas Spherical Propagation Flames." Combustion Science and Technology 188, no. 7 (2016): 1054–72. http://dx.doi.org/10.1080/00102202.2016.1145118.

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25

Concetti, Riccardo, Josef Hasslberger, Nilanjan Chakraborty, and Markus Klein. "Effects of Water Mist on the Initial Evolution of Turbulent Premixed Hydrogen/Air Flame Kernels." Energies 17, no. 18 (2024): 4632. http://dx.doi.org/10.3390/en17184632.

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In this study, a series of carrier-phase direct numerical simulations are conducted on spherical expanding premixed hydrogen/air flames with liquid water addition. An Eulerian–Lagrangian approach with two-way coupling is employed to describe the liquid–gas interaction. The impacts of preferential diffusion, the equivalence ratio, water loading, and the initial diameter of the water droplets are examined and analyzed in terms of flame evolution. It is observed that liquid water has the potential to influence flame propagation characteristics by reducing the total burning rate, flame area, and b

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26

Song, Won Sik, Seong Wook Jung, Jeong Park, et al. "Effects of syngas addition on flame propagation and stability in outwardly propagating spherical dimethyl ether-air premixed flames." International Journal of Hydrogen Energy 38, no. 32 (2013): 14102–14. http://dx.doi.org/10.1016/j.ijhydene.2013.08.037.

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27

NISHIKI, Shinnosuke, and Tatsuya HASEGAWA. "209 DNS of Spherical Flame Propagation in Large Scale Parallel Computing." Proceedings of The Computational Mechanics Conference 2013.26 (2013): _209–1_—_209–2_. http://dx.doi.org/10.1299/jsmecmd.2013.26._209-1_.

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28

Bauwens, C. Regis L., Jeffrey M. Bergthorson, and Sergey B. Dorofeev. "Modeling the formation and growth of instabilities during spherical flame propagation." Proceedings of the Combustion Institute 37, no. 3 (2019): 3669–76. http://dx.doi.org/10.1016/j.proci.2018.07.098.

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29

An, Zhenhua, Jiangkuan Xing, Abhishek Lakshman Pillai, and Ryoichi Kurose. "Numerical study on spherical flame propagation in dispersed liquid ammonia droplets." Fuel 357 (February 2024): 129660. http://dx.doi.org/10.1016/j.fuel.2023.129660.

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30

Mitu, Maria, Venera Giurcan, Domnina Razus, and Dumitru Oancea. "Inert Gas Influence on Propagation Velocity of Methane-air Laminar Flames." Revista de Chimie 69, no. 1 (2018): 196–200. http://dx.doi.org/10.37358/rc.18.1.6073.

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The flame propagation in methane-air mixtures diluted by inert additives (He, Ar, N2, CO2) was studied by means of pressure-time records of laminar deflagrations occurring in a spherical vessel with central ignition. Experiments were made using mixtures with various equivalence ratios between 0.610 and 1.310 and various inert concentrations between 5 and 25 vol%, at various initial pressures between 50 and 200 kPa. Examination of pressure-time records in the early stage of explosions delivered the normal burning velocities Su via the coefficients of the cubic law of pressure rise, using a prev

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31

Duan, Yi, and Shunbing Zhu. "Study on Dust Explosion of Wheat Starch Inerted by NaHCO₃." Journal of Physics: Conference Series 2539, no. 1 (2023): 012100. http://dx.doi.org/10.1088/1742-6596/2539/1/012100.

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Abstract With the aim of researching the inerting effect of NaHCO3 upon the wheat starch dust explosion, the test of explosion pressure was implemented by 20L spherical explosion test system. The results showed that as NaHCO3 mass fraction increased, the maximal explosion pressure and the maximal explosion pressure rise ratio of wheat starch dust decreased gradually. When 70wt% NaHCO3 was added, the maximal explosion pressure and the maximal explosion pressure rise ratio of wheat starch dust lessened by 73.82% as well as 93.88%, separately. The deflagration flame propagation experiment of NaHC

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32

Kanareykin, A. I. "Analysis of the danger of thermal radiation of a spherical flame." IOP Conference Series: Earth and Environmental Science 1070, no. 1 (2022): 012003. http://dx.doi.org/10.1088/1755-1315/1070/1/012003.

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Abstract A new mathematical model of spherical flame propagation during emergency emission and ignition of mixtures of hydrocarbon gases in an open space has been developed. A comparative analysis of the results of the study made it possible to establish the main mechanisms of heating of a combustible gas mixture as a result of radiation from gorenje products. As a result of mathematical modeling, the resulting radiation model meets the real gorenje conditions of gas-air mixtures.

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33

Grimshaw, R., and J. Gan. "Analysis of a differential equation occurring in the theory of flame fronts." Journal of the Australian Mathematical Society. Series B. Applied Mathematics 36, no. 1 (1994): 1–16. http://dx.doi.org/10.1017/s0334270000010195.

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AbstractRonney and Sivashinsky [2] and Buckmaster and Lee [1] have proposed a certain non-autonomous first order ordinary differential equation as a simple model for an expanding spherical flame front in a zero-gravity environment. Here we supplement their preliminary numerical calculations with some analysis and further numerical work. The results show that the solutions either correspond to quenching, or to steady flame front propagation, or to rapid expansion of the flame front, depending on two control parameters. A crucial component of our analysis is the construction of a barrier orbit w

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34

Ronney, P. D., and G. I. Sivashinsky. "A Theoretical Study of Propagation and Extinction of Nonsteady Spherical Flame Fronts." SIAM Journal on Applied Mathematics 49, no. 4 (1989): 1029–46. http://dx.doi.org/10.1137/0149062.

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35

Li, Haiyue, Huangwei Zhang, and Zheng Chen. "Effects of endothermic chain-branching reaction on spherical flame initiation and propagation." Combustion Theory and Modelling 23, no. 3 (2018): 496–514. http://dx.doi.org/10.1080/13647830.2018.1555338.

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36

CARRIER, G., F. FENDELL, K. CHEN, and S. COOK. "Evaluating a Simple Model for Laminar-Flame-Propagation Rates. II. Spherical Geometry." Combustion Science and Technology 79, no. 4-6 (1991): 229–45. http://dx.doi.org/10.1080/00102209108951768.

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37

Liu, Chuang, Guoxun Jing, and Yue Sun. "Research on deflagration behavior of gas and gas-coal dust in a vertical pressure relief pipeline system." Thermal Science, no. 00 (2023): 50. http://dx.doi.org/10.2298/tsci221104050l.

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Gas explosion and gas-coal dust explosion are serious disasters in coal mine production. To further study the hazards of gas explosion and gas and coal dust explosion under different conditions, experiments were done in this paper in a pipeline system containing an explosion pipeline and pressure relief pipeline. Flame propagation behavior and overpressure dynamics of gas explosion and gas coal dust explosion were analyzed. Flame propagation behavior of gas explosion and gas-coal dust explosion are divided into three stages: spherical flame, round-finger flame, and pointed-finger flame. Flame

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38

Peng, Zhengbiao, Jafar Zanganeh, and Behdad Moghtaderi. "Influence of Gradually Inflated Obstructions on Flame Propagation in a Tube Closed at One End." Fire 6, no. 4 (2023): 154. http://dx.doi.org/10.3390/fire6040154.

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Rapid suppression is a must in the mitigation of ventilation air methane (VAM) explosions. Flame suppression proves to be much more challenging than prevention of flame initiation due to the small physics timescale (~1 s). This study numerically investigates the effect of spherical obstructions on flame propagation dynamics in a tube closed at one end. Obstructions with an inflating geometry, installed at different locations, were examined. Noticeably, in the presence of a single or multiple obstructions that partially block the tube, flame and pressure waves propagate faster upstream than in

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39

Chen, Zheng. "Effects of radiation absorption on spherical flame propagation and radiation-induced uncertainty in laminar flame speed measurement." Proceedings of the Combustion Institute 36, no. 1 (2017): 1129–36. http://dx.doi.org/10.1016/j.proci.2016.05.003.

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40

Nguyen, Minh Tien, and Shenqyang (Steven) Shy. "A Transition of Ignition Kernel Delay Time at the Early Stages of Lean Premixed n-Butane/Air Turbulent Spherical Flame Propagation." Applied Sciences 12, no. 8 (2022): 3914. http://dx.doi.org/10.3390/app12083914.

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This paper explores the effects of root-mean-square turbulence fluctuation velocity (u′) and ignition energy (Eig) on an ignition kernel delay time (τdelay) of lean premixed n-butane/air spherical flames with an effective Lewis number Le ≈ 2.1 >> 1. Experiments are conducted in a dual-chamber, fan-stirred cruciform burner capable of generating near-isotropic turbulence with negligible mean velocities using a pair of cantilevered electrodes with sharp ends at a fixed spark gap of 2 mm. τdelay is determined at a critical flame radius with a minimum flame speed during the early stages of la

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41

Picone, J. M., and J. P. Boris. "Vorticity generation by shock propagation through bubbles in a gas." Journal of Fluid Mechanics 189 (April 1988): 23–51. http://dx.doi.org/10.1017/s0022112088000904.

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We present a new theoretical model of ‘late-time’ phenomena related to the interaction of a planar shock with a local, discrete inhomogeneity in an ambient gas. The term ‘late-time’ applies to the evolution of the inhomogeneity and the flow field after interaction with the incident shock has ceased. Observations of a shock propagating through a bubble or a spherical flame have exhibited or implied the formation of vortex structures and have showed continual distortion of the bubble or flame. Our theory shows that this is due to the generation of long-lived vorticity at the edge of the discrete

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42

Continillo, G., and W. A. Sirignano. "Numerical study of multicomponent fuel spray flame propagation in a spherical closed volume." Symposium (International) on Combustion 22, no. 1 (1989): 1941–49. http://dx.doi.org/10.1016/s0082-0784(89)80209-7.

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43

Cai, Xiao, Shouguo Su, Limin Su, et al. "Structure and propagation of spherical turbulent iron-methane hybrid flame at elevated pressure." Combustion and Flame 255 (September 2023): 112918. http://dx.doi.org/10.1016/j.combustflame.2023.112918.

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44

Nguyen, Minh Tien, Dewei Yu, Chunyen Chen, and Shenqyang (Steven) Shy. "General Correlations of Iso-octane Turbulent Burning Velocities Relevant to Spark Ignition Engines." Energies 12, no. 10 (2019): 1848. http://dx.doi.org/10.3390/en12101848.

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A better understanding of turbulent premixed flame propagation is the key for improving the efficiency of fuel consumption and reducing the emissions of spark ignition gasoline engines. In this study, we measure turbulent burning velocities (ST) of pre-vaporized iso-octane/air mixtures over wide ranges of the equivalence ratio (φ = 0.9–1.25, Le ≈ 2.94–0.93), the root-mean-square (r.m.s.) turbulent fluctuating velocity (u′ = 0–4.2 m/s), pressure p = 1–5 atm at T = 358 K and p = 0.5–3 atm at T = 373 K, where Le is the effective Lewis number. Results show that at any fixed p, T and u′, Le < 1

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45

Zhang, Yimin, Yan Wang, Ligang Zheng, Tao Yang, Jianliang Gao, and Zhenhua Li. "Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas." Energies 11, no. 10 (2018): 2496. http://dx.doi.org/10.3390/en11102496.

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In this study, pristine palygorskite powders were used as the inhibition materials to suppress the explosion of methane-air premixed gas for the first time. The composition, porosity and pyrolysis characteristics of the powders were tested by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), N2 adsorption-desorption and Thermogravimetry-differential scanning calorimetry (TG-DSC) techniques. The effects of pristine palygorskite powders concentration on the explosion pressure and the average velocity of flame propagation of the 9.5% methane-air premixed gas were tested by a 20 L sph

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46

Hadi, Khalid, Ryo Ichimura, Nozomu Hashimoto, and Osamu Fujita. "Spherical turbulent flame propagation of pulverized coal particle clouds in an O2/N2 atmosphere." Proceedings of the Combustion Institute 37, no. 3 (2019): 2935–42. http://dx.doi.org/10.1016/j.proci.2018.09.021.

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Santner, Jeffrey, Francis M. Haas, Yiguang Ju, and Frederick L. Dryer. "Uncertainties in interpretation of high pressure spherical flame propagation rates due to thermal radiation." Combustion and Flame 161, no. 1 (2014): 147–53. http://dx.doi.org/10.1016/j.combustflame.2013.08.008.

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Weng, Zifeng, Yakun Zhang, Brian McN Maxwell, and Rémy Mével. "The effect of finite molecular volume on the propagation of unsteady spherical flame front." Combustion and Flame 263 (May 2024): 113404. http://dx.doi.org/10.1016/j.combustflame.2024.113404.

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Li, Ruikang, Zhenmin Luo, Tao Wang, Fangming Cheng, and Anning Zhou. "Emissions Characteristics of OH During H2/CH4/Air Mixtures Explosion in a 20 L Closed Tank." Energies 18, no. 4 (2025): 953. https://doi.org/10.3390/en18040953.

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To study the emission intensity of OH during H2/CH4/air mixtures explosion, experiments were performed inside a 20 L spherical closed tank. The pressure history and flame propagation characteristics of H2/CH4/air mixtures explosion were recorded and analyzed. The effects of the volume fraction of hydrogen and equivalence ratio on explosion pressure, flame radius, and emission intensity of OH were surveyed. The results show that after α > 0.6, hydrogen started to take a leading role in the explosion pressure and flame propagation of H2/CH4/air mixtures. The effect on the high equivalence rat

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NAKAGAWA, Ryo, Waku WATANABE, Toshiyuki KATSUMI, and Satoshi KADOWAKI. "Propagation characteristics of spherical flame of H2 / Air / Ar premixed gas in high temperature field." Proceedings of Conference of Hokuriku-Shinetsu Branch 2020.57 (2020): M013. http://dx.doi.org/10.1299/jsmehs.2020.57.m013.

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