关键词: 撞击式喷嘴；撞击角；雾化特性； CLSVOF；数值仿真

Abstract: Aiming at elucidating the detailed atomization process of the impinging-jet injector in liquid rock.et motor and the relationship between impingement angle and atomization characteristics of liquid sheet formedby the injector，numerical investigation of atomization characteristics of impinging jets injector is conductedbased on the CLSVOF(Coupled Level-Set and Volume-of-Fluid Method)method. The study is focused on the effects of impingement angle on the atomization characteristics，and the simulation results are compared with thetheoretic results. The simulation results show that the atomization characteristics of the liquid sheet formed by theimpinging jets can be effectively captured by the CLSVOF method. By studying the liquid distribution of the atom.ization region，the liquid distribution in the atomization process can be divided into three regions: the separatedjets region before the jets impact，the liquid sheet region after the jets impact and the formation of ligaments anddroplets region. The present numerical results also show that the atomization process is affected not only by the in.stability caused by velocity difference on the gas-liquid interface，but also other factors such as turbulence inten. sity and impact wave. The breakup length of liquid sheet decreases with the increasing impingement angle，the amplitude of surface wave on the liquid sheet and the breakup intensity of liquid sheet increase with the increas.ing impingement angle. The velocity difference at the location of impact point formed by the impinging jets plays akey role in the breakup of liquid sheet and formation of surface wave.

Key words: Impinging jets injector；Impingement angle；Atomization characteristics；CLSVOF；Numerical investigation