Numerical simulation and validation of flame acceleration and DDT in hydrogen air mixtures

Karanam, Aditya; Sharma, Pradip Kumar; Ganju, Sunil

doi:10.1016/j.ijhydene.2018.07.108

Cited by 25 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our numerical simulations closely match the overall trend observed in the experimental data. Furthermore, when we compare our results to those presented by Karanam et al [39], it becomes evident that our calculated results are in strong agreement with their outcomes. This collective evidence underscores the satisfactory performance of our model, yielding qualitatively acceptable results for simulating both deflagration and DDT phenomena.…”

Section: Numerical Validationsupporting

confidence: 91%

See 1 more Smart Citation

Numerical Investigation of the Effects of Diffusion Time on the Mechanisms of Transition from a Turbulent Jet Flame to Detonation in a H2-Air Mixture

Saeid,

Khadem,

Emami

et al. 2023

Fire

View full text Add to dashboard Cite

The current study primarily aimed to simulate detonation initiation via turbulent jet flame acceleration in partial-premixed H2-air mixtures. Different vertical concentration gradients were generated by varying the duration of hydrogen injection (diffusion time) within an enclosed channel filled with air. H2-air mixtures with average hydrogen concentrations of 22.5% (lean mixture) and 30% (near stoichiometric mixture) were investigated at diffusion times of 3, 5, and 60 s. Numerical results show that the vertical concentration gradient significantly influences the early stage of flame acceleration (FA). In the stratified lean mixture, detonation began at all the diffusion times, and comparing the flame-speed graphs showed that a decrease in the diffusion time and an increase in the mixture inhomogeneity speeded up the flame propagation and the jet flame-to-detonation transition occurrence in the channel. In the stratified H2-air mixture with an average hydrogen concentration of 30%, the transition from a turbulent jet flame to detonation occurred in all the cases, and the mixture inhomogeneity weakened the FA and delayed the detonation initiation.

show abstract

Section: Numerical Validationsupporting

confidence: 91%

“…Figure 6. Flame front speed in 22.5% average-concentration uniform and stratified H2-air mixtures, plus the results of experimental [38] and numerical [39].…”

Section: Numerical Validationmentioning

confidence: 99%

Numerical Investigation of the Effects of Diffusion Time on the Mechanisms of Transition from a Turbulent Jet Flame to Detonation in a H2-Air Mixture

Saeid,

Khadem,

Emami

et al. 2023

Fire

View full text Add to dashboard Cite

show abstract

“…On the other hand, using large-size water mist introduces external disturbances to the premixed flame. Studies have indicated that under external disturbances like shock waves and particles, deflagration flames might transform into detonation [45,46]. In strong flame acceleration state, precursor shock waves focus continuously due to reflections on the walls, concentrating energy locally and eventually triggering detonation [47,48].…”

Section: Introductionmentioning

confidence: 99%

Localized water mist method enabling superior premixed hydrogen-methane-air deflagration mitigation in semi-confined space

Xia,

Zhang,

Zhang

et al. 2024

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

“…In order to study the relevant characteristics of the hydrogen–air mixture gas explosion with a concentration gradient, Wang and Wen 24 analyzed the flame propagation velocity and pressure distribution. Karanam et al 25 also carried out a numerical simulation study on the flame acceleration and DDT of hydrogen–air mixtures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Gas Explosion with Non-uniform Concentration Distribution by Using OpenFOAM

Yang,

Liu,

Gao

et al. 2023

ACS Omega

View full text Add to dashboard Cite

Gas explosions in coal mines have occurred occasionally, which may cause casualties and economic losses. In the actual mine roadway, the gas concentration distribution is uneven because the gas density is lower than that of air. Gas explosion characteristics of uneven gas distribution with the concentration gradient in mine roadways were analyzed by using the open-source computational fluid dynamic code OpenFOAM. The flame and pressure characteristics were calculated, and the flame and shock wave propagation laws of the non-uniform gas–air mixture explosion with different concentration gradients were analyzed and compared with the uniform gas–air mixture gas. The results show that when the overall gas concentration is the same, the flame velocity and the pressure growth rate of the uniform gas explosion are lower than those of the non-uniform, but the pressure peaks of both are similar. At the same time, when the initial volume concentration is 10%, the non-uniform gas explosion has the highest flame propagation velocity and peak value. The peak explosion pressure of different concentration gradients is proportional to the initial concentration. The above studies clarified the characteristics of gas–air mixture explosions with concentration gradients and provided theoretical support for the prevention and control of gas explosion disasters.

show abstract

Numerical simulation and validation of flame acceleration and DDT in hydrogen air mixtures

Cited by 25 publications

References 23 publications

Numerical Investigation of the Effects of Diffusion Time on the Mechanisms of Transition from a Turbulent Jet Flame to Detonation in a H2-Air Mixture

Numerical Investigation of the Effects of Diffusion Time on the Mechanisms of Transition from a Turbulent Jet Flame to Detonation in a H2-Air Mixture

Localized water mist method enabling superior premixed hydrogen-methane-air deflagration mitigation in semi-confined space

Numerical Simulation of Gas Explosion with Non-uniform Concentration Distribution by Using OpenFOAM

Contact Info

Product

Resources

About