【摘要】：前混合磨料水射流與后混合磨料水射流相比,磨料粒子速度松弛情況和混合均勻性好得多。磨料在系統(tǒng)中加速情況影響系統(tǒng)的能量傳遞效率和切割能力,加速過程可分為管內(nèi)加速、噴嘴加速以及噴嘴外流場(chǎng)核心段加速三個(gè)過程。本文應(yīng)用液固兩相流理論,對(duì)噴嘴外流場(chǎng)磨粒進(jìn)行受力分析,建立外流場(chǎng)加速模型,研究表明,磨料粒子在噴嘴外流場(chǎng)核心區(qū)加速,達(dá)到速度最大值,在過渡段和空氣摻混,粒子速度下降,在噴嘴外流場(chǎng)速度松弛比大于噴嘴內(nèi)流場(chǎng),但噴嘴外流場(chǎng)核心段速度增量遠(yuǎn)遠(yuǎn)小于噴嘴段。
[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.
【作者單位】： 安徽理工大學(xué);
【分類號(hào)】：TG664
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本文編號(hào)：2222670