排灌机械工程学报2016，Vol.34Issue(8)：686-692,7.DOI:10.3969/j.issn.1674-8530.16.0028
后混式磨料射流喷嘴内部流场模拟及分析
Numerical analysis of internal flow of abrasive entrained waterjet nozzle
摘要
Abstract
Abrasive entrained waterjet nozzle is a core component of high-pressure abrasive waterjet equipment.In order to investigate the internal flow and particle movement in the nozzle,numerical simu-lation of the multiphase flow in the nozzle was conducted based on the Euler -Lagrange approach,and Discrete Particle Method was adopted to calculate the trajectories of abrasive particles by taking the shape factor of particles and the energy loss due to the collision with the wall into consideration.The results indicate that the air phase near the entrance of focusing tube has a comparatively large tangen-tial velocity which will drag the particles to conduct circumferential movement,and the resulting cen-trifugal force will enhance the possibility of the collision of the particles with the local wall which can enhance the erosion in this area.A longer focusing tube will contribute to the dissipation of the circu-mferential movement and guarantee the particles ejecting from focusing tube without large tangential ve-locity.The deceasing of particle shape factor will enhance the acceleration of abrasive particles.The particle inlet velocity has little impact on the particle outlet velocity in the current nozzle model.The results are of importance to gaining a deep insight of the nozzle internal flow and nozzle optimization.关键词
磨料射流/喷嘴/数值模拟/流场分析/多相流Key words
abrasive entrained waterjet/nozzle/numerical simulation/fluid flow analysis/multiphase flow分类
农业科技引用本文复制引用
龙新平,刘琦,阮晓峰,陈正文,薛胜雄,武子全..后混式磨料射流喷嘴内部流场模拟及分析[J].排灌机械工程学报,2016,34(8):686-692,7.基金项目
国家863计划项目（2015AA043401）；辽宁省科技创新重大专项 （）
