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International journal of heat and mass transfer v.121, 2018년, pp.924 - 932   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Characterizing external flashing jet from single-hole GDI injector

Guo, Hengjie (State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ) ; Wang, Bo (School of Mechanical Engineering, University of Birmingham, Birmingham B15 2TT, UK ) ; Li, Yanfei (State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ) ; Xu, Hongming (State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China ) ; Wu, Zhijun (School of Automotive Studies, Tongji University, Shanghai 201804, China ) ;
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    Abstract In this research, n -hexane jets discharged from a single-hole gasoline direct injector (GDI) were studied in a constant volume vessel. The injection temperature ranged from 20 °C to 100 °C, and the ambient pressure varied from 4 kPa to 101 kPa. The jets were in the external flashing regime over all the superheated conditions with the maximum R p of 60.23. At the ambient pressures lower than 10 kPa, a liquid core can be observed inside the sprays, surrounded by the mist composed of fine droplets. With the increase in the injection temperature, the length of the liquid core decreased and the mist area became wider. By correlating the nucleation rate with the spray width, it was found that the intensity of bubble blast was positively related to the nucleation rate when the nucleation rates were relatively low. However, as the nucleation rate reached a critical point, the thermal energy for vaporization became the rate-controlling factor. Furthermore, realizing external flashing was proposed as a potential way to mitigate the collapse of multi-jet flashing GDI sprays because it could suppress the severe jet overlap near the nozzle exit, which was believed as one of the necessary conditions for the spray collapse. Highlights Flashing jets discharged from a single-hole GDI injector were characterized. The jets were in the external flashing regime over all the superheated conditions. The radial expansion of jet was determined by both nucleation rate and thermal energy. A possible way to mitigate the collapse of multi-jet flashing GDI sprays was proposed.


  • 주제어

    Gasoline direct injection .   External flashing .   Radial expansion .   Nucleation rate .   Thermal energy.  

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