Combustion and detonation of propane–air compositions in large-scale experiments

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• 作者：V. I. Tarzhanov ; V. G. Vil’danov ; V. I. Sdobnov…
• 关键词：combustion ; detonation ; deflagration ; to ; detonation transition ; propane–air compositions ; large ; scale experiments
• 刊名：Combustion, Explosion, and Shock Waves
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：52
• 期：5
• 页码：524-534
• 全文大小：4,372 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics
  Mechanics, Fluids and Thermodynamics
  Physical Chemistry
  Vibration, Dynamical Systems and Control
  Engineering, general
  Russian Library of Science
  
• 出版者：Springer New York
• ISSN：1573-8345
• 卷排序：52

文摘

This paper presents the results of two large-scale tests performed to clarify the conditions for the detonation of propane–air compositions in model surface clouds in the absence and in the presence of confining rigid walls. Model clouds with dimensions of 15 × 6 × 4.2 and 15 × 6 × 2 m were confined by plastic tents. A mixture of the starting reagents in the cloud was ignited by hot detonation products propagating along a perforated ø0.82 × 23 m tube passing through the space of the tent. Hot detonation products were injected from the tube through holes of 20 and 40 mm diameters. Detonation of the propane-air mixture in the tube was initiated by explosion of an explosive charge placed at the tube end. Detonation occurred in the propane–air cloud bounded on one side by a rigid vertical wall, and no detonation was observed in the cloud with similar injection of hot products without a rigid wall. It is concluded that the divergence or convergence of the flows of hot detonation products plays a key role in the process, being responsible for the presence or absence of detonation, respectively, in the mixing region.