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《Journal of Vibration and Shock》 2015-16
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Numerical simulation of abrasive particles acceleration process in pre-mixed abrasive water jet

LIN Xiao-dong;LU Yi-yu;TANG Ji-ren;ZHANG Wen-feng;CHENG Yu-gang;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam,Chongqing University;  
Considering the difficulties in experimental research on abrasive particles acceleration process in premixed abrasive water jet( AWJ) and the mesh distortion problem in dealing with large structural deformation with finite element method( FEM),the abrasive particles acceleration characteristics at different stages of nozzle operation and the process of target body breaking by AWJ were simulated based on an integrated algorithm of smoothed particle hydrodynamics( SPH) and FEM,in which the water was simulated by SPH,and the abrasive particles,the nozzle,the target body and so on were simulated by FEM. The abrasive particle swarm trajectories in the nozzle and the impact of nozzle structure on abrasive particles acceleration were analyzed. The results show that,the erosion pit section of the target body is " V" shaped and continues to deepen under the AWJ action. The abrasive particles have substantially reached the same speed as the water before entering the nozzle converging section. After the abrasive particles enter the nozzle convergent section,they are accelerated. However,the velocity difference between the water and the abrasive particles gradually widens. After entering the straight segment,the water and the abrasive particles are accelerated all the time,and the water velocity approaches to be steady at the end of the line segment. Within a short distance from the nozzle,the water velocity stabilizes,and the abrasive particles in the core segment of water flow continue to accelerate and finally approach to be steady. Abrasive particles collide one another violently in the nozzle convergent section,and their movement is relatively flat after entering the nozzle straight segment. Under constant flow,the abrasive particle velocity increases with the extension of the nozzle convergence section,but the velocity increases slightly. The abrasive particle velocity increases with the extension of the straight segment,but the velocity increases significantly. On the whole,the results are basically consistent with the results in relevant literatures.
【Fund】: 国家重点基础研究发展计划资助(2014CB239206);; 国家自然科学基金青年基金项目(51404045);; 长江学者和创新团队发展计划资助(IRT13043);; 中国博士后科学基金项目(2014M552322);; 中央高校基本科研业务费科研专项(CDJZR12248801)
【CateGory Index】: TG664
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