An Experimental Study of Different Obstacle Types for Flame Acceleration and DDT

2015 ◽  
pp. 265-279 ◽  
Author(s):  
Joshua A. T. Gray ◽  
Christian O. Paschereit ◽  
Jonas P. Moeck
Keyword(s):  
Experimental Study ◽  
Flame Acceleration

Experimental Study On Premixed Flame Acceleration In Closed Pipe

2013 ◽  
Vol 62 (1) ◽  
Author(s):  
M. H. Mat Kiah ◽  
R. M. Kasmani
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Equivalence Ratio ◽  
Flame Speed ◽  
The Other ◽  
Premixed Flame ◽  
High Mass ◽  
Mass Burning Rate ◽  
Straight Pipe ◽  
Flame Acceleration

An experimental study has been carried out to investigate the flame acceleration in closed pipe. A horizontal steel pipe, with 2 m long and 0.1 m diameter, giving L/D ratio of 20 was used in this project. For test with 90 degree bends, the bend has a radius of 0.1 m and added a further 1 m to the length of the pipe (based on the centerline length of the segment). Ignition was affected at one end of the vessel while the other end was closed. Natural gas/oxygen mixtures were studied with equivalence ratio, Ф ranges from 0.5 to 1.8. It was demonstrated that bending pipe gave three times higher in overpressure (5.5 bars) compared to 2.0 bars of straight pipe. It is also shown that the flame speed is 63 m s-1, greater by factor of ~ 3 for explosion in bending pipe in comparison with straight pipe (23 m s-1). This is due to bending acting similar to obstacles. This mechanism could induce and create more turbulence, initiating the combustion of unburned pocket at the corner region, causing high mass burning rate and hence, increasing the flame speed.

Experimental study of spherical-flame acceleration mechanisms in large-scale propane–air flames

2015 ◽  
Vol 35 (2) ◽  
pp. 2059-2066 ◽  
Author(s):  
C. Regis Bauwens ◽  
Jeffrey M. Bergthorson ◽  
Sergey B. Dorofeev
Keyword(s):  
Experimental Study ◽  
Large Scale ◽  
Spherical Flame ◽  
Flame Acceleration

Experimental study on the flame acceleration of premixed hydrocarbons-hydrogen/air mixtures in tee pipes

2017 ◽  
Vol 45 ◽  
pp. 229-241
Author(s):  
Sina Davazdah Emami ◽  
Rafiziana Md. Kasmani ◽  
Zahra Naserzadeh ◽  
Che Rosmani Che Hassan ◽  
Mahar Diana Hamid
Keyword(s):  
Experimental Study ◽  
Flame Acceleration

Experimental study on the onset of flame acceleration due to cellular instabilities

2019 ◽  
Vol 60 ◽  
pp. 264-268 ◽  
Author(s):  
Wookyung Kim ◽  
Yoshitatsu Sato ◽  
Tomoyuki Johzaki ◽  
Takuma Endo
Keyword(s):  
Experimental Study ◽  
Flame Acceleration

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study
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