Results 261 to 270 of about 760,958 (323)

Numerical study on flame acceleration and deflagration-to-detonation transition: Spatial distribution of solid obstacles

The Physics of Fluids
This study conducts a detailed numerical investigation on the spatial distribution of solid obstacles using the large eddy simulation method. It is discovered that although flame acceleration induced by solid obstacles is dominated by factors such as ...
Jiabao Wang, Tong Li, Shaoqiu Ji, Yunxi Nie, Xi Zhuo Jiang, Yuejin Zhu   +5 more
semanticscholar   +1 more source

Gas-flame acceleration regimes within tubes

Combustion, Explosion, and Shock Waves, 1987
The authors consider modeling of propagation of an accelerating flame upon ignition of a gas mixture at the closed end of a tube. The calculations performed used the turbulent combustion model based on an equation for the concentration probability distribution density (PDD). The equation was tested for the simpler problem of ignition and propagation of
M. A. Andreev, A. M. Stepanov
openaire   +1 more source

Acceleration of a flame by flame- vortex interactions

Combustion and Flame, 1990
The acceleration of a premixed flame propagating in a planar channel past stationary obstacles is investigated using a computer model based on combining the discrete vortex method with a flame interface algorithm. Results presented in this article show that the initial acceleration of the flame is caused by the sudden contraction of the flow due to the
openaire   +1 more source

Flame acceleration and deflagration to detonation transition in a microchannel with catalytic nickel walls

The Physics of Fluids
The characteristic behavior of the wall exerts a strong influence on the flame acceleration (FA) and deflagration-to-detonation transition (DDT) processes in microchannels [Ramachandran et al., “A numerical investigation of deflagration propagation and ...
Suryanarayan Ramachandran, S. R. Narayanan, Zhiyan Wang, Arsam Behkish, Suo Yang   +4 more
semanticscholar   +1 more source

Numerical simulation of flame acceleration and DDT(deflagration to detonation transition) in hydrogen-air mixtures with concentration gradients

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
In this paper, a coupled new solver is used to simulate the acceleration and deflagration to detonation transition (DDT) of inhomogeneous mixtures flame under obstacle conditions.
Yang Liu, Xing Yang, Zhixi Fu, Peng Chen
semanticscholar   +1 more source

Turbulent flame acceleration and deflagration-to-detonation transitions in ethane–air mixture

The Physics of Fluids
The deflagration-to-detonation transition (DDT) poses significant risks in the oil, gas, and nuclear industries, capable of causing catastrophic explosions and extensive damage.
Jinzhou Li, S. van Loo, Junfeng Yang, Andrzej Pekalski   +3 more
semanticscholar   +1 more source

Flame acceleration and detonation initiation in a non-uniform hydrogen–air mixture with a combination of fluid and solid obstacles

The Physics of Fluids
Flame acceleration and the deflagration-to-detonation transition (DDT) process in premixed combustible gases are complex phenomena involving both fluid dynamics and chemical reactions.
Yuejin Zhu, Xinyu Zhao, Liangyi Fan
semanticscholar   +1 more source

A novel configuration capable of enhancing flame acceleration and detonation

The Physics of Fluids
This study proposes a novel design concept that leverages the geometric effects of channels with varying diameters and bends to boost flame acceleration and detonation in microchannels.
Tao Li, Xingchao Li, Baopeng Xu
semanticscholar   +1 more source

Flame Acceleration and DDT in a Channel with Continuous Triangular Obstacles: Effect of Blockage Ratio

Combustion Science and Technology, 2022
Experiments were conducted in a stoichiometric hydrogen-oxygen mixture at initial pressure of 1 atm to study the flame acceleration and deflagration-to-detonation transition (DDT) in a 20 mm high channel equipped with continuous triangular obstacles ...
Xiaoxi Li, Jizhou Dong, Kaiqiang Jin, Qiangling Duan, Jinhua Sun, Huahua Xiao   +5 more
semanticscholar   +1 more source

Theory and modeling of accelerating flames in tubes

Physical Review E, 2005
The analytical theory of premixed laminar flames accelerating in tubes is developed, which is an important part of the fundamental problem of flame transition to detonation. According to the theory, flames with realistically large density drop at the front accelerate exponentially from a closed end of a tube with nonslip at the walls.
Vitaly, Bychkov, Arkady, Petchenko, V'yacheslav, Akkerman, Lars-Erik, Eriksson   +3 more
openaire   +2 more sources