首页|Study on Transient Flow Characteristics of an Internal-Mixing Air-Assisted Atomizer Based on Large Eddy Simulation
Study on Transient Flow Characteristics of an Internal-Mixing Air-Assisted Atomizer Based on Large Eddy Simulation
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NETL
The two-phase flow inside the atomizer is a transient process, which has a direct impact on jet breakup and atomization performance. This paper takes an internal-mixing air-assisted atomizer as research object. It selected VOF (Volume of Fluid) as the multiphase flow model and LES (Large Eddy Simulation) as the turbulence model, and simulated the flow pattern inside the atomizer. By changing ALR (air liquid mass ratio) and liquid flow rate, the flow characteristics and the fluctuation characteristics of flow parameters on the outlet were studied. The results showed that increasing ALR and liquid flow rate can make the liquid column and liquid film in the mixing chamber more stable. When the liquid flow rate is constant, an increase in the ALR leads to higher overall values in the fluctuation of void fraction, gas velocity, and liquid velocity. Conversely, with a constant ALR, an increase in the liquid flow rate results in higher overall values of gas and liquid velocity fluctuation. Although the overall values of the void fraction fluctuation decrease, the amplitude of the fluctuation increases. Therefore, better atomization effects are achieved by increasing both the ALR and the liquid flow rate.
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