Large Eddy Simulation and Study on Vortex Characteristics of Submerged Abrasive Jet

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (19) : 1-6.

ZHANG Xin-wei ,2，LU Yi-yu 1,2，ZHOU Zhe1,2, TANG Ji-Ren1,2

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Abstract

Based on the theory of vortex motion, the vorticity field of submerged abrasive jet had been simulated using two-phase large eddy simulation method. The mechanism of eddy diffusion and entrainment had been analyzed, and abrasive distribution with vortex movement had been acquired. The vortex distribution of the shear layer is symmetrical. Vorticity on both sides of the vortex mixing presents exponential attenuation to the minimum value, mixing into turbulent mixing zone. The potential core is irrotational everywhere. Compared with pure water jet, the existence of abrasive makes vortex motion abate, eddy diffusion angle decrease by about 50% and potential core grow by about 30%. The abrasive affected by vortex tends to be distributed in the area of high strain rate and low vorticity. Abrasive concentrates in the downstream side of vortex. It was also studied by simulation that the influence of the abrasive parameters on vorticity field. The results show that the diffusion angle（14.1-15.1°） and potential core basically remain unchanged with the abrasive parameters changing; The entrainment ability decreases slightly with the abrasive concentration、partical size and density.

Key words

Submerged Water Jet / Abrasive Jet / Vortex / Large Eddy Simulation;

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ZHANG Xin-wei,2，LU Yi-yu 1,2，ZHOU Zhe1,2, TANG Ji-Ren1,2. Large Eddy Simulation and Study on Vortex Characteristics of Submerged Abrasive Jet[J]. Journal of Vibration and Shock, 2016, 35(19): 1-6

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