Results 41 to 50 of about 5,124 (165)

Numerical Analysis for Hydrogen Flame Acceleration during a Severe Accident in the APR1400 Containment Using a Multi-Dimensional Hydrogen Analysis System

Energies, 2020
Korea Atomic Energy Research Institute (KAERI) established a multi-dimensional hydrogen analysis system to evaluate hydrogen release, distribution, and combustion in the containment of a Nuclear Power Plant (NPP), using MAAP, GASFLOW, and COM3D.
Hyung Seok Kang, Jongtae Kim, Seong Wan Hong, Sang Baik Kim   +3 more
doaj   +1 more source

Influence of Local Accumulation of Polyethylene Dust Cloud on Flame Propagation

Chemical Engineering Transactions, 2019
The flame propagation characteristic of polyethylene dust cloud inside a semi-open tube is studied in virtue of high-speed photographing technology. The rules of the influence of initial distribution range of polyethylene dust cloud on flame speed and ...
Lei Pang, Ran Ma, Shoutao Hu, Pengfei Lv, Kai Yang   +4 more
doaj   +1 more source

Large eddy simulation and calculation of propagation characteristics of hydrogen flame under obstacle conditions

You-qi chuyun
[Objective] Compared with conventional gas fuel, hydrogen is more susceptible to explosion. Meanwhile, the existence of obstacles notably stimulates hydrogen combustion and accelerates flame propagation, causing more serious consequences of accidents. To
LI Xiang, WANG Jun, SONG Caiyu, MEI Yuan, SHUAI Jian, ZHANG Guangxue, LI Yuntao   +6 more
doaj   +1 more source

Prediction of explosion dynamics of H2/NH3/Air using large eddy simulation and thickened flame model

Case Studies in Thermal Engineering
To enhance the safety of hydrogen-ammonia fuel utilization, this study explores the complicated relationship between hydrogen content (α(H2)) and explosion dynamics.
Xi Chen, Qianhang Jia, Shoukun Xu, Kai Zheng, Ming Peng   +4 more
doaj   +1 more source

Impact of Radiative Losses on Flame Acceleration and Deflagration to Detonation Transition of Lean Hydrogen-Air Mixtures in a Macro-Channel with Obstacles

Fluids, 2018
While there has been some recognition regarding the impact of thermal boundary conditions (adiabatic versus isothermal) on premixed flame propagation mechanisms in micro-channels (hydraulic diameters <10 mm), their impact in macro-channels has often ...
Gautham Krishnamoorthy, Lucky Nteke Mulenga   +1 more
doaj   +1 more source

Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

Applied Sciences, 2019
Ignition position is an important factor affecting flame propagation and deflagration-to-detonation transition (DDT). In this study, 2D reactive Navier−Stokes numerical studies have been performed to investigate the effects of ignition position on ...
Hongtao Zheng, Shizheng Liu, Ningbo Zhao, Xiang Chen, Xiongbin Jia, Zhiming Li   +5 more
doaj   +1 more source

Effects of inert gas addition on the characteristics of spherically expanding hydrogen-methane-air premixed flames in closed combustion vessels

Journal of Thermal Science and Technology
In the serious accident at Fukushima Daiichi Nuclear Power Station, the presence of steam together with flammable organic compounds affected the hydrogen explosion. To investigate the effects of addition of inert gas, i.e.
Toshiyuki KATSUMI, Atsushi ZEMBA, Makoto KOGISHI, Kohei IWANAGA, Satoshi ABE, Pascal DIÉVART, Nabiha CHAUMEIX, Satoshi KADOWAKI   +7 more
doaj   +1 more source

Flame propagation characteristics and gas-phase oxidation of nitrous oxide and propane

Case Studies in Thermal Engineering
Nitrous oxide and fuel blends propellant as one of the substitutes for highly toxic hydrazine are under investigation. This study investigated the flame structure and dynamics of stoichiometric nitrous oxide and propane mixture (N2O/C3H8) by using ...
Yuyan Li, Sen Xu, Yemin Liu, Jiawei Cui, Feiyang Xu   +4 more
doaj   +1 more source

Gas flame acceleration in long ducts [PDF]

Journal of Loss Prevention in the Process Industries, 2015
In many practical situations, a flame may propagate along a pipe, accelerate and perhaps transform into a devastating detonation. This phenomenology has been known, more or less qualitatively, for a long time and mitigation techniques were proposed to try and avoid this occurrence (flame arresters, vents,...).
openaire   +3 more sources

Flame acceleration studies in the MINIFLAME facility

, 1989
Flame acceleration and deflagration-to-detonation transition (DDT) studies have been conducted in a 19.4-cm high, 14.5-cm wide, and 2. 242-m long channel (MINIFLAME) that is a 1:12.6 scale model of the 136-m{sup 3} FLAME facility. Tests were conducted with two levels of hydrogen concentration -- 20% and 30%, with and without obstacles in the channel ...
S. Tieszen, M. Sherman, W. Benedick
openaire   +2 more sources