Premixed flame response to oscillatory pressure waves

Teerling, O. J.; McIntosh, Andy C.; Brindley, J.; Tam, V.H.Y.

doi:10.1016/j.proci.2004.08.271

Cited by 22 publications

(10 citation statements)

References 22 publications

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“…waves. Among these phenomena, pressure waves have a direct effect on flame instabilities, as shown in experiments [1,2] and numerical simulations [3][4][5].…”

mentioning

confidence: 89%

Effects of pressure waves on the stability of flames propagating in tubes

Xiao

Houim

Oran

2017

Proceedings of the Combustion Institute

133

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Numerical simulations were performed to study the effects of pressure waves on the evolution and stability of flames propagating in tubes. The model is the fully compressible reactive Navier-Stokes equations coupled to a calibrated one-step chemical-diffusive model for combustion in a stoichiometric hydrogen-air mixture. The numerical solution method is high order in space and time, and adaptive mesh refinement provides adequate resolution of flames, boundary layers, acoustic waves, and all of their interactions. The influence of tube length scale and aspect ratio was examined for a range of tube sizes that produce tulip flames (TFs) and series of distorted tulip flames (DTFs). The simulations show that pressure waves and acoustic properties of the tube play an important role in the flame evolution, specifically in the formation and evolution of the series of increasingly wrinkled DTFs. A time scale and pressure wave analysis of the results, combined with a linear analysis to give the growth rate of the Rayleigh-Taylor instability (RTI), shows that the RTI is a primary cause for the initiation of DTFs.

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“…waves. Among these phenomena, pressure waves have a direct effect on flame instabilities, as shown in experiments [1,2] and numerical simulations [3][4][5].…”

mentioning

confidence: 89%

Effects of pressure waves on the stability of flames propagating in tubes

Xiao

Houim

Oran

2017

Proceedings of the Combustion Institute

133

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“…This sgs combustion model neglects wrinkling and corrugation produced by the interaction between the propagating flame and the acoustic waves reflected by the walls and/or objects in the combustion chamber. It has been found that this kind of interaction, which can lead to a number of instability processes, is critical in large-scale explosion tests (length of the combustion chamber of the order of meters) [37], where the acoustic time (chamber length divided by sound speed) is comparable with the combustion time (thermal diffusion divided by typical burning velocity 2 ). In the present work, explosions occurring in a small-scale combustion chamber are simulated.…”

Section: Sub-grid Scale (Sgs) Modelsmentioning

confidence: 99%

Using Large Eddy Simulation for understanding vented gas explosions in the presence of obstacles

Sarli

Benedetto

Russo

2009

Journal of Hazardous Materials

136

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“…Fluorinated polyimide (FPI) i.e 6FDA-6FpDA is a type of heterocyclic aromatic polyimides which contains bulky fluorine fragments ( ̶ CF3)2, serving as a non-planar, twisted structure in the main branch of polymer [1][2][3]. Among the aromatic polyimide class, fluorine-containing polyimide seems very popular among scientists because of its superior characteristics such as thermo-oxidative capability [4], high chemical resistance [5], low refractive index [6,7], low water absorption [6,8], soluble in a range of organic solvents [9], high permselectivity [10][11][12] and fair resistance to plasticization [13,14]. These aforementioned characteristics explained why this class of polymer is a promising candidate for gas separation application.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high molecular weight polyimide consisting hexafluoroisopropylidene moiety for gas separation

Mokri¹,

Oh²,

Mukhtar³

et al. 2017

J. MECH. ENG. SCI.

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In this work, high molecular weight of heterocyclic aromatic polyimide consisting hexafluoroisopropylidene moiety in both diamine and dianhydride fragments was synthesised. The synthesis was performed via a two-step polycondensation route, which involved polyamic acid formation and chemical imidization. Subsequently, physical purification technique was conducted by microfiltration and re-crystallisation to obtain oligomers-free high molecular weight polymer. Selections of high purity and suitable solvent, type of amine catalyst, precipitation medium and reaction temperature were considered to favour the formation of high molecular weight polyimide. The synthesised polyimide was characterised by ATR-FTIR, which confirmed the presence of significant imide bands denoting the formation of imide linkage. Further confirmation of polyimide molecular structure was accomplished using 13 C and 1 H NMR. It was found that polyimide with high molecular weight (4500 KDa) was obtained with a polydispersity index of 1.48. Therefore, this polymer has favourable properties for gas separation membrane application.

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Premixed flame response to oscillatory pressure waves

Cited by 22 publications

References 22 publications

Effects of pressure waves on the stability of flames propagating in tubes

Effects of pressure waves on the stability of flames propagating in tubes

Using Large Eddy Simulation for understanding vented gas explosions in the presence of obstacles

Synthesis of high molecular weight polyimide consisting hexafluoroisopropylidene moiety for gas separation

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