Influence of different ignition conditions on deflagration characteristics of a premixed mixture of H<sub>2</sub> and air in a closed pipe

SUN Conghuang; QU Yandong; LIU Wanli; ZHAI Cheng

doi:10.11883/bzycj-2016-0309

Volume 38 Issue 3

Feb. 2018

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WANG Bao-zhen, HU Shi-sheng. Dynamiccompressionexperimentsofporcineham muscle[J]. Explosion And Shock Waves, 2010, 30(1): 33-38. doi: 10.11883/1001-1455(2010)01-0033-06

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SUN Conghuang, QU Yandong, LIU Wanli, ZHAI Cheng. Influence of different ignition conditions on deflagration characteristics of a premixed mixture of H₂ and air in a closed pipe[J]. Explosion And Shock Waves, 2018, 38(3): 622-631. doi: 10.11883/bzycj-2016-0309

WANG Bao-zhen, HU Shi-sheng. Dynamiccompressionexperimentsofporcineham muscle[J]. Explosion And Shock Waves, 2010, 30(1): 33-38. doi: 10.11883/1001-1455(2010)01-0033-06

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Influence of different ignition conditions on deflagration characteristics of a premixed mixture of H₂ and air in a closed pipe

doi: 10.11883/bzycj-2016-0309

College of Civil Engineering and Architecture, Liaoning University of Technology, Jinzhou 121001, Liaoning, China

Received Date: 2016-10-20
Rev Recd Date: 2017-01-16
Publish Date: 2018-05-25

Abstract

Abstract

Numerical simulation was carried out by applying the fluid dynamics software Fluent to explore the influences of different ignition conditions, such as ignition locations (the distances from the left wall of the closed pipe are 100, 200, and 500 mm, respectively), ignition temperatures (1 000, 1 500 and 2 000 K) and ignition area (ignition radius:50, 35 and 20 mm) on the deflagration characteristics of the premixed H₂/air mixture in a closed pipe with 1 000 mm in length. The results show that, when the ignition positions are far away from the left wall of the closed pipe, the temperature of the intermediate node in the flow field is higher and the temperature rising is faster in the closed pipe. The rising rates of the maximum temperatures are basically synchronous on the conditions of the three different ignition temperatures (1 000, 1 500 and 2 000 K). Meanwhile, the combustion reaction of H₂/air is more intense with the increasing of the ignition temperatures. The temperature rising rate in the closed pipe is accelerated. However, the peak pressure in the closed pipe is reduced. Moreover, the smaller the ignition area, the faster the temperature rising of H₂/air in the early stage. When the radius of the ignition area is 35 mm and the ignition position away from the left side wall of the closed pipe is 100 mm, the deflagration parameters of H₂/air are relatively higher. The influence of different ignition conditions on the kinetic energy and internal energy is similar to the influence of different ignition conditions on the velocity and temperature of the premixed gas, but the ignition conditions hardly influence the vorticity.
- ignition condition,
- closed pipe,
- premixed flame,
- turbulent combustion,
- frame front

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References(20)

References

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