Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Study on Atomization Characteristics of Shear Coaxial Injectors

전단동축형 분사기들의 미립화 특성에 대한 연구

  • 안종현 (충북대학교 기계공학부) ;
  • 이근석 (충북대학교 기계공학부) ;
  • 안규복 (충북대학교 기계공학부)
  • Received : 2021.01.08
  • Accepted : 2021.01.27
  • Published : 2021.03.31
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Abstract

Six shear coaxial injectors with different recess length and taper angle were manufactured. Cold-flow tests on the injectors were performed at room temperature and pressure using water and air as simulants. By changing the water mass flow rate and air mass flow rate, spray images were taken under single-injection and bi-injection. Breakup length and spray angle were analyzed from instantaneous and averaged spray images using image processing techniques. For all the injectors, the breakup length generally decreased as the momentum flux ratio increased at the same gas mass flow rate. The injectors with 7.5° taper angle usually had the longest breakup length and the smallest spray angle. When the taper angle was 15° or more, it hardly affected breakup length and spray angle. The recess length did not influence breakup length but its effect on spray angle depended on the taper angle.

Keywords

References

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