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Abstract
Prefilming air blast atomizer is mainly used in the gas turbine engine of an airplaine. Annular liquid sheet flows on a solid surface called prefilmer and is broken into small droplets by aerodynamic force. In this study, a new model for breakup of liquid sheet from air blast atomizer is proposed. In this model, longitudinal wavelength λ_1, and transversal wavelength λ_2 are predicted based on hydrodynamic instability. Liquid sheet thickness h is also predicted theoretically. Given that volume of liquid lamp λ_1,λ_2 ,h equals to volume of liquid ligament 2(πd_l2^/4)λ_1+(π/2)( πd_l^2/4)λ_2 , ligament diameter di is determined. Ligament diameter then gives droplet diameter through Weber's theory. Finally, Droplet diameter D after secondary breakup is calculated using TAB model in which air velocity at atomizer exit U_<Aexit> determined in numerical simulation is used as characteristic velocity. The predicted parameters, λ_1,λ_2 ,h,d_1,U_<Aexit> and D, arel compared with experimental results. The predicted results show good agreement with experimental results.
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