Experimental and Numerical Study on Characteristics of Air-assisted Spray and Spray Flames

2유체 분무의 연소특성에 관한 실험 및 수치 해석적 연구

  • 김동일 (부산대학교 기계기술연구소) ;
  • 오상헌 (부산대학교 기계공학부)
  • Published : 1998.12.31


Air-assisted atomizer flames are investigated numerically to study spray structures in nonburning and burning conditions based on experimental data. A PDA is used to measure droplet size, velocity, and number density for both nonburning and burning spray. Computations utilize time-averaged gas-phase equations and $k-{\varepsilon}$ turbulence model for simplicity. The major features of the liquid-phase model are that a SSF approach is used to represent the effect of gas-phase turbulence on droplet trajectories and vaporization, an infinite-diffusion model is employed to represent the transient liquid-phase process. Computation and experiment results show that the droplet acceleration and evaporation proceed quickly in near the atomizer, characterizing high number densities and a strong convective effect. The primary combustion zone, however, is dorminated by the gas phase reaction and exhibits a sheath combustion.