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Flame kernel evolution and shock wave propagation with laser ignition in ethanol-air mixtures

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  • Bao, Xiuchao
  • Sahu, Amrit
  • Jiang, Yizhaou
  • Badawy, Tawfik
  • Xu, Hongming

Abstract

Flame kernel evolution and shock wave propagation in ethanol/air mixtures with laser ignition in a constant-volume chamber was investigated by means of high-speed Schlieren photography. At initial pressure of 0.1 MPa and temperature of 333 K, ignition was performed using a pulsed laser at the second harmonic wavelength with six different laser energies from 75 to 200 mJ, for the equivalence ratios ranging from 0.8 to 1.4. A cross-shaped plasma spot is captured ∼3.0 µs after the laser triggering, whereas the shape of the flame kernel is initially circular and then transforms to an ellipsoid structure. Following the contraction of the plasma, the flame kernel growth rate is initially very different in the four directions and then approaches a steady flame speed. The contraction of the plasma zone is accompanied by a rapid shock wave propagation where, the wave propagation speed is found to be negligibly influenced by the variations in either laser energy or mixture equivalence ratio. Under the test conditions in this study for ethanol/air mixtures, the initial shock wave speed is ∼480 m/s which decays to ∼380 m/s after 20 µs. The shock wave front propagates with a time dependency of about t0.6 when t < 20 µs, and then it becomes an approximately linear function of time.

Suggested Citation

  • Bao, Xiuchao & Sahu, Amrit & Jiang, Yizhaou & Badawy, Tawfik & Xu, Hongming, 2019. "Flame kernel evolution and shock wave propagation with laser ignition in ethanol-air mixtures," Applied Energy, Elsevier, vol. 233, pages 86-98.
    • Handle: RePEc:eee:appene:v:233-234:y:2019:i::p:86-98
    DOI: 10.1016/j.apenergy.2018.10.017
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    References listed on IDEAS

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    1. Morsy, Mohamed H., 2012. "Review and recent developments of laser ignition for internal combustion engines applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(7), pages 4849-4875.
    2. Wang, Chongming & Zeraati-Rezaei, Soheil & Xiang, Liming & Xu, Hongming, 2017. "Ethanol blends in spark ignition engines: RON, octane-added value, cooling effect, compression ratio, and potential engine efficiency gain," Applied Energy, Elsevier, vol. 191(C), pages 603-619.
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    Cited by:

    1. Singh, Awanish Pratap & Padhi, Upasana P. & Joarder, Ratan & Roy, Arnab, 2019. "Spatio-temporal effect of the breakdown zone in the laser-initiated ignition of atomized ethyl alcohol-air mixture," Applied Energy, Elsevier, vol. 247(C), pages 140-154.
    2. Junjie Zhang & Erjiang Hu & Qunfei Gao & Geyuan Yin & Zuohua Huang, 2021. "Shock Wave Propagation and Flame Kernel Morphology in Laser-Induced Plasma Ignition of CH 4 /O 2 /N 2 Mixture," Energies, MDPI, vol. 14(23), pages 1-17, November.
    3. Huang, Zhiwei & Zhang, Huangwei, 2020. "Investigations of autoignition and propagation of supersonic ethylene flames stabilized by a cavity," Applied Energy, Elsevier, vol. 265(C).

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