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The influence of flash boiling conditions on spray characteristics with closely coupled split injection strategy

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

Abstract

The isooctane spray characteristics under various flash boiling conditions were studied with high speed imaging technique and Phase Doppler particle Analyser (PDPA) technique. The potential of closely coupled split injection strategy to alleviate fuel impingement and the corresponding spray characteristics were also investigated. It was found that flash boiling led to obvious collapse of spray and improved atomization. The increasing strength of flash boiling (excluding the transitional stage) resulted in increasing penetration and potential impingement. Stronger flash boiling caused smaller droplets and higher possibility for the droplets to further breakup. Closely coupled split injection strategy effectively reduced the overall spray penetration and the potential impingement. The flash boiling considerably weakened the collision between split injections and the interaction in liquid phase but strengthened the interaction in gas phase. The dwell interval exerted marginal effects on the penetration rate for each split injection event under flash boiling conditions due to the weakened interaction in liquid phase. By contrast, under non-flash boiling condition, the second split injection observably affected by the variation of dwell interval. Besides, split injection strategy resulted in larger droplet sizes than single injection strategy and the increasing flash boiling strength decreased the size difference between injection strategies.

Suggested Citation

  • Wang, Ziman & Jiang, Changzhao & Xu, Hongming & Badawy, Tawfik & Wang, Bo & Jiang, Yizhou, 2017. "The influence of flash boiling conditions on spray characteristics with closely coupled split injection strategy," Applied Energy, Elsevier, vol. 187(C), pages 523-533.
    • Handle: RePEc:eee:appene:v:187:y:2017:i:c:p:523-533
    DOI: 10.1016/j.apenergy.2016.11.089
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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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    2. Liu, Fushui & Li, Zhishuang & Wang, Ziman & Dai, Xiaoyu & He, Xu & Lee, Chia-Fon, 2018. "Microscopic study on diesel spray under cavitating conditions by injecting fuel into water," Applied Energy, Elsevier, vol. 230(C), pages 1172-1181.
    3. Wang, Ziman & Guo, Hengjie & Wang, Chongming & Xu, Hongming & Li, Yanfei, 2017. "Microscopic level study on the spray impingement process and characteristics," Applied Energy, Elsevier, vol. 197(C), pages 114-123.
    4. Asgari, Behrad & Amani, Ehsan, 2017. "A multi-objective CFD optimization of liquid fuel spray injection in dry-low-emission gas-turbine combustors," Applied Energy, Elsevier, vol. 203(C), pages 696-710.
    5. Han, Taehoon & Singh, Ripudaman & Lavoie, George & Wooldridge, Margaret & Boehman, André, 2020. "Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines," Applied Energy, Elsevier, vol. 262(C).
    6. Zhang, Wenbin & Zhang, Zhou & Ma, Xiao & Awad, Omar I. & Li, Yanfei & Shuai, Shijin & Xu, Hongming, 2020. "Impact of injector tip deposits on gasoline direct injection engine combustion, fuel economy and emissions," Applied Energy, Elsevier, vol. 262(C).
    7. Xinda Zhu & Manu Mannazhi & Natascia Palazzo & Per-Erik Bengtsson & Öivind Andersson, 2020. "High-Speed Imaging of Spray Formation and Combustion in an Optical Engine: Effects of Injector Aging and TPGME as a Fuel Additive," Energies, MDPI, vol. 13(12), pages 1-26, June.
    8. Shu, Jun & Fu, Jianqin & Liu, Jingping & Ma, Yinjie & Wang, Shuqian & Deng, Banglin & Zeng, Dongjian, 2019. "Effects of injector spray angle on combustion and emissions characteristics of a natural gas (NG)-diesel dual fuel engine based on CFD coupled with reduced chemical kinetic model," Applied Energy, Elsevier, vol. 233, pages 182-195.
    9. Qiu, Shuyi & Yao, Bowei & Wang, Shangning & Zhang, Weixuan & Hung, David L.S. & Xu, Min & Li, Xuesong, 2023. "Droplet characteristics of multi-plume flash boiling spray evaluation using SLIPI-LIEF/Mie planar imaging technique," Energy, Elsevier, vol. 282(C).
    10. 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.

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