Results 1 to 10 of about 5,247 (115)
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. A series of calculations are carried out for hydrogen–air and hydrogen–oxygen flames in channels. The analysis of the obtained numerical results provided the value of 11 ± 0.25 % hydrogen content in
Kiverin A, Tyurnin A, Yakovenko I.
europepmc +3 more sources
Flame acceleration in channels with obstacles in the deflagration-to-detonation transition [PDF]
Combustion and Flame, 2010 It was demonstrated recently in Bychkov et al., Phys. Rev. Lett. 101 (2008) 164501, that the physical mechanism of flame acceleration in channels with obstacles is qualitatively different from the classical Shelkin mechanism. The new mechanism is much stronger, and is independent of the Reynolds number.
Vâyacheslav +2 more
exaly +3 more sources
Numerical analysis of flow fields generated by accelerating flames [PDF]
17th Aerospace Sciences Meeting, 1979 A numerical technique is presented for the analysis of nonsteady flowfields generated by accelerating flames in gaseous media. The problem is formulated in Eulerian coordinates and the solution is based on the extension of the floating shock-fitting technique to all the discontinuities and their interactions occurring in the flowfield.
Kurylo, J., Dwyer, H.A., Oppenheim, A.K.
openaire +1 more source
Flame Acceleration Enhancement by Distributed Ignition Points
Journal of Propulsion and Power, 2005 This paper reports on the investigation of a novel method for promoting flame acceleration leading to detonation initiation in a tube. A common method used to initiate a detonation wave is via flame acceleration in an obstacle laden tube. Previous studies with fuel-air mixtures have shown that the measured detonation run-up distance, and corresponding ...
Ciccarelli, Gaby +2 more
openaire +2 more sources
Characteristics of diffusion flames with accelerated motion
Thermal Science, 2016 The aim of this work is to present an experiment to study the characteristics of a laminar diffusion flame under acceleration. A Bunsen burner (nozzle diameter 8 mm), using liquefied petroleum gas as its fuel, was ignited under acceleration.
Bo Lou, Yonghai Qiu, Jianhong Xu
openaire +2 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
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
Analysis of flame acceleration in open or vented obstructed pipes
Physical Review E, 2017 While flame propagation through obstacles is often associated with turbulence and/or shocks, Bychkov et al. [V. Bychkov et al., Phys. Rev. Lett. 101, 164501 (2008)10.1103/PhysRevLett.101.164501] have revealed a shockless, conceptually laminar mechanism of extremely fast flame acceleration in semiopen obstructed pipes (one end of a pipe is closed; a ...
Vitaly, Bychkov +2 more
openaire +3 more sources
A Computational Fluid Dynamic Investigation of Inhomogeneous Hydrogen Flame Acceleration and Transition to Detonation. [PDF]
Flow Turbul Combust, 2018 Khodadadi Azadboni R, Heidari A, Wen JX.
europepmc +1 more source
Simulation of Flame Acceleration and DDT [PDF]
Linköping Electronic Conference Proceedings, 2018 openaire +1 more source