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Numerical Simulation Research of Liquid-Solid Two-Phase Flow in Abrasive Water Jet Nozzle 被引量:3
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作者 聂百胜 孟筠青 姬宗锋 《Journal of Beijing Institute of Technology》 EI CAS 2009年第2期157-161,共5页
According to the Lagrange discrete phase model of multiphase flow, mathematical model of the abrasive water-jet (AWJ) nozzle based on the multi-phase movement was introduced, then the boundary conditions was determi... According to the Lagrange discrete phase model of multiphase flow, mathematical model of the abrasive water-jet (AWJ) nozzle based on the multi-phase movement was introduced, then the boundary conditions was determined and the liquid-solid turbulence which is isothermal, can not be compressed and steadystate in the cone-cylinder nozzles of the export of the pre-mixed AWJ was simulated applying the software FLUENT. The results showed that: the axial velocity and dynamic pressure of the continuous phase in the nozzle were axial symmetry notable, and at the axis had a extreme point; abrasive accelerated at two points, in front contractive segment, the rate increased rapidly, and in the back straight one, the speed accelerated slowly. The length of the cylinder is 100 mm, the diameter of the nozzle is 8 mm, and the angle of the cone is 15°. There is a extreme point of the rate at the point 10 mm in the established model. The results of simulation laid the foundation for optimizing the nozzle structure, improving efficiency and developing the nozzle. 展开更多
关键词 water jet cutting ABRASIVE NOZZLE numerical simulation
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Air flow exploration of abrasive feed tube
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作者 Shijin Zhang Xiaohong Li Yilei Gu College of Resources and Environmental Science,Chongqing University, 400044 Chongqing, China 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2009年第6期761-768,共8页
An abrasive water-jet cutting process is one in which water pressure is raised to a very high pressure and forced through a very small orifice to form a very thin high speed jet beam. This thin jet beam is then direct... An abrasive water-jet cutting process is one in which water pressure is raised to a very high pressure and forced through a very small orifice to form a very thin high speed jet beam. This thin jet beam is then directed through a chamber and then fed into a secondary nozzle, or mixing tube. During this process, a vacuum is generated in the cham- ber, and garnet abrasives and air are pulled into the chamber, through an abrasive feed tube, and mixes with this high speed stream of water. Because of the restrictions introduced by the abrasive feed tube geometry, a vacuum gradient is generated along the tube. Although this phenomenon has been recog- nized and utilized as a way to monitor nozzle condition and abrasive flowing conditions, yet, until now, conditions inside the abrasive feed line have not been completely understood. A possible reason is that conditions inside the abrasive feed line are complicated. Not only compressible flow but also multi- phase, multi-component flow has been involved in inside of abrasive feed tube. This paper explored various aspects of the vacuum creation process in both the mixing chamber and the abrasive feed tube. Based on an experimental exploration, an analytical framework is presented to allow theoretical calculations of vacuum conditions in the abrasive feed tube. 展开更多
关键词 Abrasive feed tube- water jet cutting. Vacuum gradient
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