Influence of ignition criterion and dilution gas on ignition delay of ethylene

LIU Erwei; XU Shengli

doi:10.11883/bzycj-2019-0402

Volume 40 Issue 6

Jun. 2020

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LIU Erwei, XU Shengli. Influence of ignition criterion and dilution gas on ignition delay of ethylene[J]. Explosion And Shock Waves, 2020, 40(6): 062101. doi: 10.11883/bzycj-2019-0402

Citation:

LIU Erwei, XU Shengli. Influence of ignition criterion and dilution gas on ignition delay of ethylene[J]. Explosion And Shock Waves, 2020, 40(6): 062101. doi: 10.11883/bzycj-2019-0402

LIU Erwei, XU Shengli. Influence of ignition criterion and dilution gas on ignition delay of ethylene[J]. Explosion And Shock Waves, 2020, 40(6): 062101. doi: 10.11883/bzycj-2019-0402

Citation:

LIU Erwei, XU Shengli. Influence of ignition criterion and dilution gas on ignition delay of ethylene[J]. Explosion And Shock Waves, 2020, 40(6): 062101. doi: 10.11883/bzycj-2019-0402

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Influence of ignition criterion and dilution gas on ignition delay of ethylene

doi: 10.11883/bzycj-2019-0402

LIU Erwei^1
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XU Shengli^{2
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1.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China
2.
School of Aerospace Engineering, Tsinghua University, Beijing 100084, China

Received Date: 2019-10-21
Rev Recd Date: 2019-12-12
Publish Date: 2020-06-01

Abstract

Abstract

Ignition delay of ethylene (C₂H₄) are measured under different temperatures in a rectangle shock tube to recognize the effects from diluent gases (nitrogen or argon) and criteria which is identified by pressure, bulk and radical chemiluminescences of OH and CH at specified wavelengths. Pressures were recorded by piezoelectric sensors (PCBs), and bulk chemiluminescence was detected by a photomultiplier (PMT) and an optical fiber. The chemiluminescences of OH and CH radicals were grated by spectrometer first, and then recorded by the PMT. The ignition delay is determined from the pressure and intensity histories of bulk and radical chemiluminescences at the points which share the same distances from the close end. Ignition delay database was built for mixture of C₂H₄/O₂/N₂ and C₂H₄/O₂/Ar. Measurement and methodology are verified by the repeated experimental data under the same conditions. In the case of stoichimetric equivalence and pressure at 0.2 MPa, ignition delays were obtained and fitted with temperature as Arrhenius formula for mixtures of C₂H₄/O₂/N₂ and C₂H₄/O₂/Ar at temperature ranging from 905 K to 1 489 K. Results show that the relative error of ignition delays is about 15%. Based on pressure, bulk and radical chemiluminescences, the relationships between the ignition delay and temperature remain the same although the ignition delay from single measurement is a bit different. Basically, the ignition delay of C₂H₄/O₂/N₂ is greater than that of C₂H₄/O₂/Ar. The fitting relationship between ignition delay and temperature of C₂H₄/O₂ /Ar in high temperature zone and low temperature zone is different, and the turning temperature is about 1 121 K.
- ignition delay,
- shock tube,
- ignition criteria,
- dilute gas,
- ethylene

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References(20)

References

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