前混合磨料水射流喷嘴外流场磨料加速过程研究

发布时间：2018-09-04 16:06

【摘要】：前混合磨料水射流与后混合磨料水射流相比,磨料粒子速度松弛情况和混合均匀性好得多。磨料在系统中加速情况影响系统的能量传递效率和切割能力,加速过程可分为管内加速、喷嘴加速以及喷嘴外流场核心段加速三个过程。本文应用液固两相流理论,对喷嘴外流场磨粒进行受力分析,建立外流场加速模型,研究表明,磨料粒子在喷嘴外流场核心区加速,达到速度最大值,在过渡段和空气掺混,粒子速度下降,在喷嘴外流场速度松弛比大于喷嘴内流场,但喷嘴外流场核心段速度增量远远小于喷嘴段。
[Abstract]:The velocity relaxation and mixing uniformity of abrasive particles in pre-mixed abrasive water jet are much better than that in post-mixed abrasive water jet. The acceleration of abrasive in the system affects the energy transfer efficiency and cutting ability of the system. The acceleration process can be divided into three processes: in-pipe acceleration, nozzle acceleration and nozzle flow field core acceleration. In this paper, the theory of liquid-solid two-phase flow is applied to analyze the stress of the abrasive particles in the nozzle flow field, and an accelerated model of the flow field is established. The results show that the abrasive particle accelerates in the core region of the nozzle flow field, reaches the maximum velocity, and is mixed with air in the transition section. The velocity relaxation ratio in the nozzle flow field is larger than that in the nozzle flow field, but the velocity increment in the core section of the nozzle flow field is much smaller than that in the nozzle section.
【作者单位】： 安徽理工大学;
【分类号】：TG664
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本文编号：2222670