Results 1 to 10 of about 760,958 (323)

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures. [PDF]

Materials (Basel), 2023
The paper presents a novel numerical approach to the quantitative estimation of the concentration limits for flame acceleration in hydrogen-based mixtures.
Kiverin A, Tyurnin A, Yakovenko I.
europepmc   +2 more sources

Flame–turbulence interactions during flame acceleration using solid and fluid obstacles

Physics of Fluids, 2022
A combination of solid and transverse jet obstacles is proposed to trigger flame acceleration and deflagration-to-detonation transition (DDT). A numerical study of this approach is performed by solving the reactive Navier–Stokes equations deploying an adaptive mesh refinement technique.
Wandong Zhao, Jianhan Liang, Ralf Deiterding, Xiaodong Cai, Xinxin Wang   +4 more
openaire   +4 more sources

Dynamic behavior and flame acceleration of spherically expanding hydrogen flames under the low-pressure conditions

Nihon Kikai Gakkai ronbunshu, 2023
To investigate the dynamic behavior and flame acceleration of spherically expanding hydrogen flames under the low-pressure conditions, the deflagration experiments were conducted in a closed combustion chamber. The dynamic behavior of hydrogen flames was
Toshiyuki KATSUMI, Shinya YAZAWA, Masashi KUMADA, Daisuke SATO, Satoshi KADOWAKI   +4 more
doaj   +1 more source

Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

Energy Science & Engineering, 2022
The aim of this paper is to analyze local autoignition induced by secondary flame acceleration. The secondary flame acceleration process and the local autoignition formation mechanism at the condition of the secondary flame acceleration propagation were ...
Yangyang Yu, Junhong Zhang, Jun Wang, Dan Wang   +3 more
doaj   +1 more source

Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

Engineering Reports, 2023
Large eddy simulation is used to simulate flame acceleration and deflagration to detonation transition of methane‐air mixtures in a small‐scale 3D channel.
Yongyao Zhao, Yanmin Zhang
doaj   +1 more source

Effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames

Journal of Thermal Science and Technology, 2023
To investigate the effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames, the experiments of premixed combustion were performed in a closed chamber.
Toshiyuki KATSUMI, Masashi KUMADA, Haruki NOGUCHI, Atsushi ZENBA, Daisuke SATO, Hiroshi YAMAGATA, Satoshi KADOWAKI   +6 more
doaj   +1 more source

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

Fire, 2023
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 ...
Mohammad Hossein Shamsaddin Saeid, Javad Khadem, Sobhan Emami, Chang Bo Oh   +3 more
doaj   +1 more source

Effect of Obstacles Gradient Arrangement on Non-Uniformly Distributed LPG–Air Premixed Gas Deflagration

Energies, 2022
The arrangement of obstacles can significantly impact the deflagration behavior of combustible gases. In the actual pipeline accident site, liquefied petroleum gas (LPG) and other gases often show non-uniform distribution after leakage owing to diffusion
Jianfeng Gao, Bingjian Ai, Bin Hao, Bingang Guo, Bingyuan Hong, Xinsheng Jiang   +5 more
doaj   +1 more source

Acceleration of Premixed Flames in Obstructed Pipes with Both Extremes Open

Energies, 2020
Premixed flame propagation in obstructed channels with both extremes open is studied by means of computational simulations of the reacting flow equations with a fully-compressible hydrodynamics, transport properties (heat conduction, diffusion and ...
Abdulafeez Adebiyi, Olatunde Abidakun, V’yacheslav Akkerman   +2 more
doaj   +1 more source

Computational Study of Premixed Flame Propagation in Micro-Channels with Nonslip Walls: Effect of Wall Temperature

Fluids, 2021
This investigation evaluates the propagation of premixed flames in narrow channels with isothermal walls. The study is based on the numerical solution of the set of fully-compressible, reacting flow equations that includes viscosity, diffusion, thermal ...
Orlando J. Ugarte, V’yacheslav Akkerman   +1 more
doaj   +1 more source