Effects of boundary conditions on premixed CH<sub>4</sub>+2O<sub>2</sub> detonation characteristics

Zhao Huanjuan; J.H.S.Lee; Zhang Yinghua; Qian Xinming; Yan Yiran

doi:10.11883/1001-1455(2017)02-0201-07

Volume 37 Issue 2

Mar. 2017

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Zhao Huanjuan, J.H.S.Lee, Zhang Yinghua, Qian Xinming, Yan Yiran. Effects of boundary conditions on premixed CH4+2O2 detonation characteristics[J]. Explosion And Shock Waves, 2017, 37(2): 201-207. doi: 10.11883/1001-1455(2017)02-0201-07

Citation:

Zhao Huanjuan, J.H.S.Lee, Zhang Yinghua, Qian Xinming, Yan Yiran. Effects of boundary conditions on premixed CH₄+2O₂ detonation characteristics[J]. Explosion And Shock Waves, 2017, 37(2): 201-207. doi: 10.11883/1001-1455(2017)02-0201-07

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Effects of boundary conditions on premixed CH₄+2O₂ detonation characteristics

doi: 10.11883/1001-1455(2017)02-0201-07

1.
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
2.
Mechanical Engineering Department, McGill University, Montreal, Quebec, Canada H3A 2K6
3.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2015-08-31
Rev Recd Date: 2015-10-27
Publish Date: 2017-03-25

Abstract

Abstract

To find out the exact effects of boundary conditions on premixed CH₄+2O₂ detonation characteristics, detonation experiments were conducted respectively in two cylindrical tubes with inner diameters of 63.5 mm and 50.8 mm and one rectangle tube. The detonation velocity curves were obtained using a signal detection system, and cellar patterns drawn from the smoked-foil records were obtained using a digital image processing program. Quantitative irregularities of CH₄+2O₂ detonation and cell size data under different initial pressures in the three tubes were analyzed and compared. It is found that the average velocities in the three tubes always closely resembled v_cj, showing that the detonation velocity is mainly determined by the initial detonation pressure and mixture type rather than by the boundary conditions. In addition, judging by the detonation velocity curves, the limit pressures of the tubes with inner diameter of 50.8 and 63.5 mm are 5 and 4.05 kPa, respectively. Therefore, the boundary conditions can influence the limit pressure. Quantitative irregularities exert little significant difference under different boundary conditions of the tubes. Besides, as the detonation needs to compensate for the energy loss with the increase of the tube diameter, there is a greater number of spin heads in the tubes.
- detonation experiments,
- premixed CH₄+2O₂,
- boundary conditions,
- detonation limits,
- image processing,
- detonation cell size

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References(17)

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