NDLI: Study of detonation initiation in hydrogen/air flow

Content Provider	Springer Nature Link
Author	Ogata, Yuji Wada, Yuji Mogi, Toshio Shiina, Hiroumi Aizawa, Keisuke Yoshi, Satoru Hayashi, A. Koichi
Copyright Year	2008
Abstract	While extensive studies have been conducted concerning the formation of detonation waves in various combustible gaseous mixtures under static conditions since the 1950s, there is very little experimental work on simple flowing systems. In this study, experiments on the deflagration to detonation transition (DDT) of a hydrogen–air flow system were carried out to see the effects of tube diameter, equivalence ratio, and flow types in a premixed and non-premixed flow. Tube diameters used were 25, 50, and 100 mm. The premixed experiments show that the larger tube diameter provides a wider range in run-up distance, reduction of L DDT/D (ratio of the run-up distance, L DDT to tube diameter), and expansion of the detonable concentration limit by spreading the cell width. The result of the non-premixed experiments show that similar values of the run-up distance to the premixed experiments are obtained at an equivalence ratio of about 1.0, however, fluctuations of DDT occur near the DDT concentration limit. Under laminar flow conditions at a Reynolds number of less than 2,300, the difference between the two systems could not be observed. However, when the Reynolds number increases towards turbulent conditions, the DDT run-up distance decreases compared to that of static flow conditions.
Ending Page	305
Page Count	7
Starting Page	299
File Format	PDF
ISSN	09381287
e-ISSN	14322153
Journal	Shock Waves
Issue Number	4
Volume Number	18
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-08-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogen/air mixture Flow system Thermodynamics Fluids Detonation DDT run-up distance Reynolds number Engineering Thermodynamics, Transport Phenomena Condensed Matter Engineering Fluid Dynamics Acoustics Premixed and non-premixed mixture
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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