Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Spray Characteristics of Two-Phase Flow Jets into a Subsonic Crossflow

아음속 횡단류로 분사되는 이상유동 제트의 분무특성

  • 이근석 (충북대학교 기계공학부) ;
  • 이원구 (충북대학교 기계공학부) ;
  • 윤영빈 (서울대학교 기계항공공학부) ;
  • 안규복 (충북대학교 기계공학부)
  • Received : 2019.02.27
  • Accepted : 2019.03.25
  • Published : 2019.03.30
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Abstract

An experimental study on the spray characteristics of aerated-liquid jets discharged from effervescent injectors to a subsonic crossflow was conducted to investigate effects of a gas to liquid mass ratio (GLR) and a ratio of the orifice length to the diameter (L/d). The present effervescent injectors consist of a plain orifice injector and an aerator. To analyze breakup length and spray trajectory, instantaneous spray images were taken by a high speed camera. As the GLR increased, the spray penetration became higher under the same liquid mass flow rate and the breakup length became shorter due to the bubble expansion or the annular liquid film breakup. To predict the spray trajectory of two-phase flow jets into the crossflow, the homogeneous and the separated flow models were compared.

Keywords

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Fig. 1 Schematic diagram of experimental apparatus

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Fig. 2 Schematic of injector assembly

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Fig. 3 Discharge coefficient as a function of GLR

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Fig. 5 Instantaneous spray images according to GLR under the crossflow condition: Inj#2, ṁl=6 g/s

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Fig. 6 Spray trajectories normalized by the orifice diameter

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Fig. 7 Spray trajectories for non-aerated liquid jets in the crossflow

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Fig. 8 Spray trajectories for aerated liquid jets in the crossflow

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Fig. 9 Breakup lengths as a function of GLR: (a) L/d=10 and (b) L/d=5

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Fig. 4 Instantaneous spray images according to GLR under the ambient condition: (a) ṁl=3 g/s and (b) ṁl=6 g/s

Table 1 Injector geometry and experimental conditions

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