【摘要】 加速机理和切割是磨料射流基础研究的两个重要方面。笔者介绍了磨料射流技术及磨料粒子与流体的混合方式,分析了前混合磨料粒子在管道及喷嘴内的加速机理。结果表明:在高压输送的圆形管道中,在水流速度的带动下,经过一定的加速距离,磨料粒子的速度基本接近水流速度;在喷嘴收缩段,水流速度和磨料粒子速度同时得到大幅度加速,但磨料粒子速度总是落后于水流速度。利用建立的前混合磨料射流切割系统进行了切割试验,考察工作压力、喷射靶距及横移速度等基本参数对切割性能的影响,试验表明,工作压力对切割性能影响较大,而喷射靶距及横移速度均存在最佳范围。同时对割缝宽度进行了讨论。更多还原

【Abstract】 Mechanism of acceleration and cutting are two important aspects of the fundamental research of premixed abrasive jet.This paper introduces abrasive jet technique and mixture ways of the abrasive particles and high pressure water.Mechanism of abrasive particles accelerated in premixed abrasive jet has been analyzed.The study shows that in the high-pressure pipeline,through an acceleration distance,speed of abrasive particles driven by the high-pressure water is close to the speed of water.In the nozzle contraction,water and abrasive particles are greatly accelerated at the same time.But the speed of abrasive particles always lags behind the speed of water.By use of the premixed abrasive jet cutting system established,cutting experiments have been made to test the main parameters which influence the cutting performances such as the working pressure,standoff and traverse velocity.The experiment results demonstrate that the working pressure has a great influence on the cutting performance;standoff and traverse velocity have their optimal value range.Cutting chink width is studied.更多还原