Physics of Fluids, Год журнала: 2025, Номер 37(6)

Опубликована: Июнь 1, 2025

In solid rocket motor, particle collision occurs mainly in nozzle, especially convergent region and throat, which may cause accumulation aggregation, subsequently influences the multiphase flow field nozzle performance. Particle collisions that occur among mono-size particles are usually overlooked by theoretical prediction, but real situation of is still lack investigation. this paper, a DEM (discrete element method) model, considering collision, coupled with CFD (computational fluid dynamics) to model nozzle. Considering agglomerate accounting for large proportion before entering whose size larger (>100 μm), chosen study paper ranging from 100 400 μm. The discussed respect basic characteristics, including probability mode. Then, different size, convergence angle, injection position, investigated detail. results show influence not negligible, probabilities 1.42% (400 μm particles) 4.29% (100 particles). Collisions predominantly thin wall layer section, thickness increasing 1.8 mm 6.8 as grows. mode bouncing, over 90% particles, while coalescence after minor deformation becomes more prevalent particles. These findings highlight importance dynamics provide foundation optimizing design

Язык: Английский