Measurement and chemical kinetic prediction of detonation sensitivity and cellular structure characteristics in dimethyl ether–oxygen mixtures

Ng, Hoi Dick; Chao, Jenny; Yatsufusa, Tomoaki; Lee, John H. S.

doi:10.1016/j.fuel.2008.07.029

Cited by 46 publications

(4 citation statements)

References 37 publications

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“…Note that the thermicity profiles are not directly accessible for the Shock reactor models. The thermicity profiles were recalculated by post-processing the simulation results, using the thermicity definition [25,40,41],…”

Section: Post Processing and Analysismentioning

confidence: 99%

Effect of the reactor model on steady detonation modeling

Chatelain

Mével

et al. 2021

Shock Waves

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The effect of employing four different reactor models, Zeldovich-von Neumann-Döring (ZND), constant volume (CV), constant pressure (CP), and the Shock routine from Chemkin, to perform detonation relevant chemical modeling was assessed. The simulation results were compared in terms of characteristic length-scales and chemical analyses with four representative mixtures:The following conclusions were drawn: (i) CV and CP reactor models shorten the induction zone length and strengthen the energy release rate in most mixtures. In terms of chemical kinetics, the impact of CP and CV reactor models is quite limited for H 2 -O 2 -N 2 mixtures and H 2 -NO 2 /N 2 O 4 . However, the C2 branch is enhanced in CV and CP reactor models for C 3 H 8 -O 2 -N 2 mixture. Moreover, both reactor models weaken the intermediate-temperature chemistry and promote the high-temperature chemistry for DME-O 2 -CO 2 mixtures; (ii) the Shock module can be employed to perform detonation modeling, as it provided similar results to the ZND simulations for all investigated

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Section: Post Processing and Analysismentioning

confidence: 99%

Effect of the reactor model on steady detonation modeling

Chatelain

Mével

et al. 2021

Shock Waves

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“…The fractal dimension derived from fractal geometry is an important parameter to quantify the degree of folds of the flame profile [22,23] and is widely used in turbulent combustion models [24,25]. The quantified study on the cellular structure under the detonation condition were studied in [26,27], Moreover, Askari and Jiang also carried out quantitative studies on the cellular structure of the expanding flame [28,29]. In the linear stability theory, the perturbation of flame instability always imposes an initial flame kernel, and the flame amplitude evolves exponentially [30,31].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Flame Instability on the Flame Structural Characteristics of Hydrogen/Air Mixtures Based on the Fast Fourier Transform

Jiang

et al. 2017

Energies

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Abstract:In this study, the effect of flame intrinsic instability on the flame structural characteristics of hydrogen/air mixtures premixed at various equivalence ratios were experimentally investigated from the macroscopic and microscopic perspectives, respectively. The correlation degree and the relative deformation degree were defined to quantitatively study the global flame structural characteristics. Peak detection was used to capture the characteristic length of the flame and fast Fourier transform was adopted to study the components of the fluctuation of the flame front. The results show that with the development of flames, the wrinkles in the flame front increase and the correlation degree of the flame decreases. The relative deformation degree of the flame first decreases and then increases. When the equivalence ratio is 0.6, the average characteristic length initially exhibits an increasing trend, followed by a decreasing trend. The average characteristic length scale gradually increases, and the growth rate gradually decreases when the equivalence ratio ranges from 0.70 to 0.99. With the increase in the wavenumber, the amplitude of the corresponding disturbance exhibited an increasing trend followed by a decreasing one. With the development of the flame, the maximum amplitude of the disturbance shows a reverse trend, i.e., first decreasing and then increasing. The disturbances with smaller wavelengths could be further developed.

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“…Premixed and non-premixed ignition of methane/DME binary fuel blends with hot air has been investigated through numerical simulation with detailed chemistry and complete thermo-chemical as well as transport properties [22]. Detonation velocities and characteristic cell sizes of DME-oxygen and DME-air mixtures have been measured by Ng et al [23] and Diakow et al [24], and the explosion and detonation characteristics of DME were experimentally investigated using a 180-L spherical vessel and a large-scale detonation tube by Mogi and Horiguchi [25]. In addition, experiments were also carried out to examine the leakage and explosion of liquid DME [26].…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of the explosion characteristics of dimethyl ether-air mixtures

Zhang

2016

Energy

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In this work, experiments are performed to study the explosion characteristics of dimethyl ether (DME) -air mixtures using a standard 20-L spherical explosion test apparatus. The experimental data reported in this paper includes: the maximum explosion pressure (pmax), flammability limits, maximum rate of pressure rise (dp/dt)max, and combustion properties (i.e., laminar burning velocity, flame radius) of DME-air mixtures at different initial conditions. The experimental results indicate that the variation between pmax and DME concentration (CDME) exhibits a typical inverse "U" shaped behavior, with the peak pmax at slightly larger than the stoichiometric concentration. pmax is also found to decrease as the initial pressure goes down. As the initial pressure decreases from 100 kPa to 40 kPa, the lower flammability limit (LFL) is observed to vary slightly, while the upper flammability limit (UFL) is found to have a more significant drop.The relation between (dp/dt)max and CDME behaves similarly as that of pmax as a function of CDME, and the explosion pressure rises more abruptly at higher initial pressure. A satisfactory agreement is also found between the laminar burning velocity determined experimentally from the pressure measurement and that computed by PREMIX simulations. The present experimental results also show that the increase of the dimensionless radius of the flame is slower at higher initial pressure.

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Measurement and chemical kinetic prediction of detonation sensitivity and cellular structure characteristics in dimethyl ether–oxygen mixtures

Cited by 46 publications

References 37 publications

Effect of the reactor model on steady detonation modeling

Effect of the reactor model on steady detonation modeling

Study on the Effect of Flame Instability on the Flame Structural Characteristics of Hydrogen/Air Mixtures Based on the Fast Fourier Transform

An experimental investigation of the explosion characteristics of dimethyl ether-air mixtures

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