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Research on the Internal Flow and Cavitation Characteristics of Petal Bionic Nozzles Based on Methanol Low-Pressure Injection

Author

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  • Yuejian Zhu

    (School of Traffic and Vehicle Engineering, Shandong University of Technology, Zibo 255022, China)

  • Yanxia Wang

    (School of Traffic and Vehicle Engineering, Shandong University of Technology, Zibo 255022, China)

  • Yannian Wang

    (School of Traffic and Vehicle Engineering, Shandong University of Technology, Zibo 255022, China)

Abstract

This paper aims to discuss the internal flow and cavitation characteristics of petal bionic nozzle holes under different injection pressures to improve the atomization effect of methanol. The FLUENT (v2022 R1) software is used for simulation. The Schnerr-Sauer cavitation model in the Mixture multiphase flow model is adopted, considering the evaporation and condensation processes of methanol fuel to accurately simulate cavitation and internal flow performance. The new nozzle hole is compared with the ordinary circular nozzle hole for analysis to ensure research reliability. The results show that the cavitation of the petal bionic nozzle hole mainly occurs at the outlet, which can enhance the atomization effect. In terms of turbulent kinetic energy, the internal turbulent kinetic energy of the petal bionic nozzle hole is greater under the same pressure. At 1 MPa, its outlet turbulent kinetic energy is 38.37 m 2 /s 2 , which is about 2.3 times that of the ordinary circular nozzle hole. When the injection pressure is from 0.2 MPa to 1 MPa, the maximum temperature of the ordinary circular nozzle hole increases by about 33.4%, while that of the petal bionic nozzle hole only increases by 12.3%. The intensity of internal convection and vortex is significantly reduced. The outlet velocity and turbulent kinetic energy distribution of the petal bionic nozzle hole are more uniform. In general, the internal flow performance of the petal bionic nozzle hole is more stable, which is beneficial to the collision and fragmentation of droplets and has better uniformity of droplet distribution. It has a positive effect on improving the atomization effect of methanol injection in the intake port of methanol-diesel dual-fuel engines.

Suggested Citation

  • Yuejian Zhu & Yanxia Wang & Yannian Wang, 2024. "Research on the Internal Flow and Cavitation Characteristics of Petal Bionic Nozzles Based on Methanol Low-Pressure Injection," Energies, MDPI, vol. 17(22), pages 1-24, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:22:p:5612-:d:1517598
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    References listed on IDEAS

    as
    1. Luca Marchitto & Luigi De Simio & Sabato Iannaccone & Vincenzo Pennino & Nunzio Altieri, 2024. "Retrofit of a Marine Engine to Dual-Fuel Methane–Diesel: Experimental Analysis of Performance and Exhaust Emission with Continuous and Phased Methane Injection Systems," Energies, MDPI, vol. 17(17), pages 1-23, August.
    2. Yu, Shenghao & Yin, Bifeng & Bi, Qinsheng & Chen, Chen & Jia, Hekun, 2021. "Experimental and numerical investigation on inner flow and spray characteristics of elliptical GDI injectors with large aspect ratio," Energy, Elsevier, vol. 224(C).
    3. Huabing Wen & Yue Yu & Jingrui Li & Changchun Xu & Haiguo Jing & Jianhua Shen, 2023. "Numerical Investigation on the Influence of Injection Location and Injection Strategy on a High-Pressure Direct Injection Diesel/Methanol Dual-Fuel Engine," Energies, MDPI, vol. 16(11), pages 1-26, June.
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