Numerical study of cellular detonation structures of methane mixtures

Trotsyuk, A. V.; Fomin, P. A.; Васильев, А. А.

doi:10.1016/j.jlp.2015.03.012

Cited by 19 publications

(10 citation statements)

References 33 publications

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“…The fine (cellular) structure of the transverse waves has been found previously in our simulations of DW in stoichiometric methane-air [2] and methane-oxygen [3] mixtures. Furthermore, Figure 2b shows a significant amount of unburned pieces of gas at a considerable distance behind the DW leading shock front, denoted as P1 and P2.…”

Section: Simulation Of 2d Structure Of Propagating Dw In a Rich Methasupporting

confidence: 79%

“…The two transverse waves form the detonation cell. According to this method, the dominant size of the detonation cell at normal initial conditions for stoichiometric methane-air mixture determines to be 34±1 cm, and 0.3÷0.35 cm for methane-oxygen mixture [2,3]. These values are in good agreement with all available experimental data.…”

Section: Simulation Of 2d Structure Of Propagating Dw In a Rich Methasupporting

confidence: 77%

“…The DW was initiated near the left closed end of the channel and propagated from left to right along the x axis. The size and energy of the initiation source [1][2][3] were chosen sufficiently large to ensure a supercritical regime of DW initiation in methane mixture. The detonation cell size for the methane-based mixture was determined in a procedure similar to that used in the numerical study of stoichiometric hydrogen mixtures [1] with regular cellular structure.…”

Section: Simulation Of 2d Structure Of Propagating Dw In a Rich Methamentioning

confidence: 99%

“…A good agreement was obtained between the numerical results and experimental data on the size a 0 over a wide range of initial pressures and degrees of mixture dilution by argon. Then we have simulated the irregular detonation structure in stoichiometric methane-air [2] and methane-oxygen [3] The objectives of this work are further development of the proposed approximate model of chemical kinetics to describe the detonation combustion of rich methane based gaseous mixtures, to perform a numerical simulation of the 2D irregular cellular structure of propagating DW in a rich methane-air mixture, and to study the flow structure in cylindrical DC with continuous rotating DW in a rich methane-oxygen mixture.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical simulation of classical and rotating detonation waves in methane mixtures

Trotsyuk

2017

J. Phys.: Conf. Ser.

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A numerical simulations of a two-dimensional multi-front irregular structure of the detonation wave (DW) in methane-based mixtures at normal initial condition have been conducted. The computations have been performed in a wide range of channel height. From the analysis of the flow structure and the number of primary transverse waves in channel, the dominant size of the detonation cell for studied mixtures has been determined. We have simulated the cellular front structure in stoichiometric methane-air and methane-oxygen mixtures, and in a rich (equivalence ratio φ=1.5) methane-air mixture. Based on the fundamental studies of front structure of the classical propagating DW in methane mixtures, numerical simulation of continuous spin detonation of rich (φ=1.2) methane-oxygen mixture has been carried out in the cylindrical detonation chamber (DC) of the rocket-type engine. We studied the global flow structure in DC, and the detailed structure of the front of the continuous rotating DW. Integral characteristics of the detonation process -the distribution of average values of static and total pressure along the length of the DC, and the value of specific impulse have been obtained. The geometric limit of stable existence of rotating DW has been determined. IntroductionOne of the most important problems in the theory of dynamic systems is the formation and destruction of ordered gas-dynamic structures in a reactive medium. An example of such a self-organizing system is a multi-front (cellular) DW steadily propagating in a reacting gas mixture. The complex threedimensional and time-dependent structure of the front of these waves propagating in constant crosssection channels shows some order, whose geometrical parameter is the size of the elementary cell of the DW − a 0 . Based on this value, it is possible to determine such parameters of detonation as critical conditions of detonation combustion, the critical energy of initiation detonation propagation limits, etc., i.e. to estimate the detonation hazard of gaseous mixture. Depending on the chemical composition of the gas, DW in some mixtures have very regular cellular structure, whereas in other mixtures DW shows very irregular chaotic cell structure. A very regular cellular DW structure in hydrogen-oxygen-argon mixtures was studied in our previous 2D numerical simulation [1]. A good agreement was obtained between the numerical results and experimental data on the size a 0 over a wide range of initial pressures and degrees of mixture dilution by argon. Then we have simulated the irregular detonation structure in stoichiometric methane-air [2] and methane-oxygen [3] mixtures.

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Section: Simulation Of 2d Structure Of Propagating Dw In a Rich Methasupporting

confidence: 79%

Section: Simulation Of 2d Structure Of Propagating Dw In a Rich Methasupporting

confidence: 77%

Section: Simulation Of 2d Structure Of Propagating Dw In a Rich Methamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical simulation of classical and rotating detonation waves in methane mixtures

Trotsyuk

2017

J. Phys.: Conf. Ser.

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Improved Reactor Productivity for the Safe Photo‐Oxidation of Citronellol Under Visible Light LED Irradiation

et al. 2019

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A simple continuous flow photochemical reactor was optimized for the safe photo‐oxidation of citronellol into precursors of rose oxide, a flagrance of commercial value. The reactor productivity was increased by a factor of 4 compared to the current literature for a conversion above 99 % and in safe conditions (up to 0.72 mM min−1 mLreactor−1). The reactor was based on a classical design described by Booker‐Milburn et al., i. e. multiple loops of perfluoroalkoxy (PFA) tubing wrapped tightly around a visible LED lamp under slug flow conditions. The influence of the type of visible white LED light (6500 K vs. 3000 K), of photosensitizers (tetraphenylporphyrin vs. methylene blue), of solvent (CH2Cl2 vs. MeOH), concentration of citronellol (0.1 M vs. 2 M) and of mass efficiency of the reactors (PFA tubing of 0.75 mm to 0.25 mm) was paramount to increase the productivity of the reactor.

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Fabrication and wave absorption property of Co C material prepared by direct detonation of gaseous hydrocarbon fuels

Zhao

Wang

Zhao

et al. 2019

Diamond and Related Materials

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Numerical study of cellular detonation structures of methane mixtures

Cited by 19 publications

References 33 publications

Numerical simulation of classical and rotating detonation waves in methane mixtures

Numerical simulation of classical and rotating detonation waves in methane mixtures

Improved Reactor Productivity for the Safe Photo‐Oxidation of Citronellol Under Visible Light LED Irradiation

Fabrication and wave absorption property of Co C material prepared by direct detonation of gaseous hydrocarbon fuels

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