Influence of water mist on flame acceleration, DDT and detonation in H2-air mixtures

Boeck, Lorenz R.; Kink, A.; Oezdin, D.; Haßlberger, Josef; Sattelmayer, Thomas

doi:10.1016/j.ijhydene.2015.03.129

Cited by 51 publications

(11 citation statements)

References 11 publications

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“…Calculate the correction factor for the thermal film thickness, F T = F (B T ), using the value of the heat transfer number, B old T , from either the previous iteration or the previous time step. 6. Calculate the modified Nusselt number, N u * , the parameter φ and the corrected value of the heat transfer number, B T :…”

Section: Resultsmentioning

confidence: 99%

“…In [3], [4] a rather thorough analysis of main factors influencing flame evolution during spraying is presented. Early small scale experiments [5] as well as recent small and medium scale experiments using hydrogen [6], [7], [8], [9] have revealed that sprays containing small-size droplets, of the order of O(10 µm) can be effective against premixed combustion.…”

Section: Introductionmentioning

confidence: 99%

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Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray

Gai

Kudriakov

Hadjadj

et al. 2019

International Journal of Hydrogen Energy

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This paper describes the development of a simplified model for pressure evolution inside a closed volume during a combustion process in presence of a water spray. The model is based on empirical correlations available in the literature. These ingredients allow us to estimate the values for the main factors influencing the pressure evolution. The results of this model are used as a guideline for adjusting the parameters of a three-dimensional hydrodynamic code based on CREBCOM combustion model, developed and validated for large-scale hydrogen combustion. The methodology is successfully assessed by comparing the computed results with the experimental data of Carlson et al. [1].

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray

Gai

Kudriakov

Hadjadj

et al. 2019

International Journal of Hydrogen Energy

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“…Both cold and hot spots are used to generate the autoignition reaction wave. It is known that, as an effective explosion inhibitor, water mist is widely used in preventing and reducing gas explosion hazard, particularly due to its easy availability [14,15]. Zhuang et al [16] study hot spot induced autoignition and detonation characteristics of n-C7H16/air mixture laden with liquid water droplets.…”

Section: Introductionmentioning

confidence: 99%

Regimes of reaction front propagation from ignition spots in n-heptane/air mixtures laden with fine water mists

Yu¹,

Zhang

2021

ICLASS

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The effects of water droplets on autoignition and detonation development induced by ignition spot with thermal inhomogeneity in n-C7H16/air mixture are numerically investigated. The Eulerian-Eulerian method considering gas-liquid two-way coupling is applied. Three initial water droplet diameters are considered, i.e., 5, 10 and 20 μm. Zero-dimensional two-phase homogeneous ignitions under the constant-volume condition are studied first. Different ignition delay time and evaporation time scales are highlighted. It is seen that of 5 μm shows nonmonotonic change with ,0 , indicating the NTC behaviours due to the water droplet addition. However, for 10 and 20 μm, increased ,0 leads to monotonically increased . Then, onedimensional two-phase autoignition and detonation development caused by temperature gradients in ignition spots is then discussed. It is found that conventional classification (i.e., (I) supersonic deflagrative wave, (II) detonative wave and (III) subsonic deflagrative wave) is also suitable for droplet laden mixtures. However, new regimes are observed for 5 μm.

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“…Moreover, as a solution, it is possible to include proper additives, e.g., alkali salts (KCl and NaCl) [6], for better explosion inhibition. There are various forms of water utilized for detonation or explosion mitigation [5,7,8], e.g., solid jet, diffuse jet and water mists. The last one is most promising since sprayed water droplets have large specific surface area and low terminal velocity, which allow them to continuously circulate in the explosion area in a manner of a total flooding gas.…”

Section: Introductionmentioning

confidence: 99%

Effect of water droplet breakup on hydrogen/air detonations

Zhao

Zhang

2021

ICLASS

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Two-dimensional numerical simulations with Eulerian-Lagrangian method are conducted to study the influence of fine water droplet breakup on detonation propagation in stoichiometric hydrogen/air mixture. General features of gas phase and water droplets are well captured. Numerical soot foils are used to characterize the influence of droplet breakup on the detonation wave, and the results confirm that droplet disintegration make propagation detonation wave more stable under the studied conditions. Analysis on unsteady detonation propagation process is performed with the evolutions of spatial distribution of interphase transfer rates (mass, energy, and momentum). The interactions between detonation wave and water droplets demonstrate that the breakup model have more pronounced influence on mass and energy transfer than the momentum transfer. Moreover, high interphase transfer rates of disintegration case are observed at the onset of detonation propagation, and they gradually decrease. It is concluded that inclusion of droplet breakup significantly alters propagation and two-phase coupling of the gaseous detonation in fine water mists.

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Influence of water mist on flame acceleration, DDT and detonation in H2-air mixtures

Cited by 51 publications

References 11 publications

Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray

Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray

Regimes of reaction front propagation from ignition spots in n-heptane/air mixtures laden with fine water mists

Effect of water droplet breakup on hydrogen/air detonations

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