Application of Composite Collision Models Under Droplet Collision and Pintle Spray
The collision model based on the Lagrangian framework in the current mainstream CFD software is not accurate enough to simulate the macroscopic characteristics of liquid-liquid pintle spray.Therefore,based on the open-source software OpenFOAM,this paper implants a composite collision model,which considers the formation of satellite droplets and four different collision regimes:coalescence(Ⅰ,Ⅲ),bouncing(Ⅱ),reflexive separation(Ⅳ)and stretching separation(Ⅴ).Moreover,this paper corrects the velocity direction of droplets in the bouncing regime and detects collision pairs by an absolutely deterministic trajectory method(improved Nordin model).Furthermore,experimental verifications of the composite collision model are carried out for binary droplet collisions and pintle sprays,such as collision processes of droplets in all regimes,spray distribution,spray angle,etc.The composite collision model can effectively apply the droplet collision dynamics to pintle sprays under different conditions.Compared with the O'Rourke model,the composite collision model is more outstanding,and can accurately predict the trends of spray angle with effective momentum ratio as well as the mixed distribution of radial liquid column and axial liquid sheet.
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