Abstract: Uneven processing effect is conducted by the single-inlet processing device in soft abrasive flow machining, to overcome this problem, a novel double-inlet processing method is brought forward based on the liquid collision theory. Combining shear stress transport(SST) k-ω turbulence model with the mixture model in computational fluid dynamics software, the dynamics characteristics for two kinds of processing devices are studied. The results show that flow field distribution of single-inlet processing device is fixed; on the contrary, a cyclic swing occurs in double-inlet processing device, and there is an improvement of the disorderly movement of abrasive flow. Work piece surface roughness value Ra in single-inlet processing device is disperse after 35 h, and the processing effect is uneven, while the surface roughness of work piece in double-inlet processing device has a centralized distribution and a smaller value than that in single-inlet processing device, and the processing effect is better. The above results show that the flow filed in restraint channel is disturbed by two flows in the double-inlet processing device, disorderly movement of the abrasive flow is improved, and processing quality is better.

Key words: Double-inlet processing device, Liquid collision, Soft abrasive flow machining, SST k-ω turbulence model