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Microscopic characterization of isooctane spray in the near field under flash boiling condition

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  • Wang, Ziman
  • Wang, Bo
  • Jiang, Changzhao
  • Xu, Hongming
  • Badawy, Tawfik

Abstract

The isooctane spray characteristics were experimentally investigated under flash boiling condition which represents the part load operating condition for modern gasoline engine. Various tests were carried out with back pressure ranging from 0.2bar to 1bar and ambient temperature varying between 20°C and 100°C. A long distance microscope together with an ultrahigh speed camera was employed to capture the spray development in the near field to study the primary breakup characteristics. The study was performed by using a diesel common rail injection system so that the influence of hydraulic force can be investigated. It was found that flash boiling led to dramatic radial propagation due to the explosion and collapse of the vapor bubbles, significantly boosting the atomization. The strength of vapor bubble explosion in the near field tended to be strongly affected by the flow regime in the nozzle. Besides, higher injection pressure led to larger cone angle during the initial injection stage but smaller cone angle during the quasi-steady stage due to the dominance of the hydraulic force.

Suggested Citation

  • Wang, Ziman & Wang, Bo & Jiang, Changzhao & Xu, Hongming & Badawy, Tawfik, 2016. "Microscopic characterization of isooctane spray in the near field under flash boiling condition," Applied Energy, Elsevier, vol. 180(C), pages 598-606.
    • Handle: RePEc:eee:appene:v:180:y:2016:i:c:p:598-606
    DOI: 10.1016/j.apenergy.2016.07.115
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    References listed on IDEAS

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    1. Wang, Ziman & Ding, Haichun & Ma, Xiao & Xu, Hongming & Wyszynski, Miroslaw L., 2016. "Ultra-high speed imaging study of the diesel spray close to the injector tip at the initial opening stage with split injection," Applied Energy, Elsevier, vol. 163(C), pages 105-117.
    2. Wang, Ziman & Ding, Haichun & Ma, Xiao & Xu, Hongming & Wyszynski, Miroslaw L., 2016. "Ultra-high speed imaging study of the diesel spray close to the injector tip at the initial opening stage with single injection," Applied Energy, Elsevier, vol. 165(C), pages 335-344.
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    Cited by:

    1. Zhang, Qing & Gao, Ya & Chu, Miaoqi & Chen, Pice & Zhang, Qingteng & Wang, Jin, 2023. "Enhanced energy conversion efficiency promoted by cavitation in gasoline direct injection," Energy, Elsevier, vol. 265(C).
    2. Zhang, Yanzhi & Xu, Leilei & Zhu, Yizi & Xu, Shijie & Bai, Xue-Song, 2023. "Numerical study on liquid ammonia direct injection spray characteristics under engine-relevant conditions," Applied Energy, Elsevier, vol. 334(C).
    3. Zhang, Jibao & Zhang, Xin & Wang, Tao & Hou, Xiaosen, 2019. "A numerical study on jet characteristics under different supercritical conditions for engine applications," Applied Energy, Elsevier, vol. 252(C), pages 1-1.
    4. Kaźmierski, Bartosz & Kapusta, Łukasz Jan, 2023. "The importance of individual spray properties in performance improvement of a urea-SCR system employing flash-boiling injection," Applied Energy, Elsevier, vol. 329(C).

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