Study of detonation initiation in hydrogen/air flow |
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Authors: | Keisuke Aizawa Satoru Yoshino Toshio Mogi Hiroumi Shiina Yuji Ogata Yuji Wada A Koichi Hayashi |
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Institution: | (1) Graduate School of Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-0006, Japan;(2) Research Core for Explosion Safety, AIST, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan;(3) Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-0006, Japan |
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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.
This paper is based on work that was presented at the 21st International Colloquium on the Dynamics of Explosions and Reactive
Systems, Poitiers, France, July 23–27, 2007. |
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Keywords: | Detonation Flow system Hydrogen/air mixture DDT run-up distance Reynolds number Premixed and non-premixed mixture |
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