EXPERIMENTAL DETERMINATION OF THE STATIC EQUIVALENT PRESSURES OF DETONATIVE EXPLOSIONS OF ETHYLENE/O_2/N_2-MIXTURES AND CYCLOHEXANE/O_2/N_2-MIXTURES IN LONG AND SHORT PIPES 机翻标题: 暂无翻译,请尝试点击翻译按钮。

会议集名/来源
Proceedings of the ASME Pressure Vessels and Piping Conference 2018: Prague, Czech Republic, July 15-20, 2018, volume 5. High-Pressure Technology; Non-destructive Evaluation, Diagnosis and Prognosis; Student Paper Symposium and Competition
出版年
2019
页码
V005T05A01-V005T05A01
会议地点
Prague
作者单位
BASF SE, Safety Engineering
作者
Hans-Peter Schildberg
摘要
In the recent past (PVP2013-97677, PVP2014-28197, PVP2015-45286, PVP2016-63223) we had started to determine the static equivalent pressures (p_(stat)) of the eight detonative Pressure scenarios in long and short pipes for different detonable gas mixtures. The p_(stat)-values are of vital importance for process design: by assigning static equivalent pressures to the highly dynamic detonative pressure peaks it is possible to apply the established pressure vessel guidelines, which can only cope with static loads, in the design of detonation pressure resistant pipes. In the previous publications the parameter R was defined as the ratio between p_(stat) at the location where transition from deflagration to detonation occurs and p_(stat) in the region of the stable detonation. One important finding was that R depends on the reactivity of the gas mixture. So far, R cannot be predicted from first principles or from combustion parameters, but can only be determined experimentally. The ratio R has a special significance, because it not only determines p_(stat) for the Deflagration to Detonation Transition (DDT) in long pipes (first detonative pressure scenario), but also gives a good estimate for two of the three scenarios relevant in the design of short pipes: DDT and the coalescence of DDT and reflection. The present paper concludes the test series conducted at BASF during the last 4 years. It presents additional experimental data showing the variation of R over the entire detonative range of Ethylene/O_2/N_2 mixtures and along the stoichiometric line of Cyclohexane/O_2/N_2 mixtures. Based on the variation of R for these ternary mixtures and for the mixtures presented in the preceding publications, a typical variation of R for a general combustible/O_2/N_2-mixture is estimated over the entire explosive range. By means of this estimation the static equivalent pressures of the six design-relevant detonative pressure scenarios of any combustible/O_2/N_2-mixture can now be derived combining the parameter R with the Chapman-Jouguet pressure ratio, which can be calculated in a straight-forward manner from thermodynamic properties.
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