Flow field visualization for ethylene/air auto-ignition at different pressures and temperatures in a rectangular shock tube

Liu Erwei; Xu Shengli

doi:10.11729/syltlx20180051

Volume 33 Issue 1

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Liu Erwei, Xu Shengli. Flow field visualization for ethylene/air auto-ignition at different pressures and temperatures in a rectangular shock tube[J]. Journal of Experiments in Fluid Mechanics, 2019, 33(1): 62-71. doi: 10.11729/syltlx20180051

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Flow field visualization for ethylene/air auto-ignition at different pressures and temperatures in a rectangular shock tube

doi: 10.11729/syltlx20180051

Liu Erwei^1
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Xu Shengli^{2
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1.
School of Engineering Science, University of Science and Technology of China, Hefei 230026, China
2.
School of Aerospace Engineering, Tsinghua University, Beijing 100084, China

Received Date: 2018-04-17
Rev Recd Date: 2018-05-31
Publish Date: 2019-02-25

Abstract

Abstract

Flow field visualization for the auto-ignition of the ethylene/air mixture is key important in understanding properties and characteristics of the flame generation and propagation. High-speed photography was used in experiments and ICCD camera was triggered by the flame signal located at the test section. The series of images for the auto-ignition flow field were obtained at different temperatures (T₅) and pressures (p₅) in a rectangular shock tube. In the case of p₅ being 106kPa, auto-ignition occurs and the initial flame is close to the tube end of shock reflection when T₅ is 1210K. Then, the flame propagates upstream (right side) and evolves as a planar one. The vortex-lets are obviously embedded in the flame surface. The flame front gradually evolves to be vertical to the tube axis as it propagates upstream. In contrast to decreasing T₅, the initial flame becomes thicker and moves away from the tube end of shock reflection. More-over, the flame emission becomes weaker corresponding to the lower reaction rate. Also, the flame decays from a planar front into several irregular zones. When T₅ is 1077K, the auto-ignition occurs far away from the tube end of shock reflection, and then propagates upstream and downstream. With increasing p₅, the flames emit strongly and the vortex-lets almost disappear on flame surfaces. When p₅ are 265 and 419kPa, respectively, the local explosions take place frequently. These local explosions merge into an approximately planar front and propagate upstream with time going by.
- shock tube,
- ethylene,
- auto-ignition,
- flow filed imaging,
- flame

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References(17)

References

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