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基于计算流体动力学多相流混合物模型,应用FLUENT软件对前混合磨料水射流除鳞喷嘴高压水与磨料混合腔内部流场进行数值模拟.比较了不同进料方式对流场均匀性的影响.分析了两侧为高压水入口条件下,磨料入口直径、高压水入口直径、高压水入口位置和角度以及收缩段锥角对流场混合均匀性的影响,得到了影响混合腔内部流场混合均匀性的合理结构参数.数值计算结果表明:入口速度一定的条件下,磨料中进式喷嘴混合腔的混合均匀性优于磨料侧进式喷嘴混合腔.随磨料入口和高压水入口直径增加,混合腔出口的射流速度均增加,但随高压水入口直径增加导致出口磨料浓度呈先增后减的趋势,磨料入口与高压水入口合理的质量流量比值约为3∶4,两侧高压水入口位置对流场混合均匀性影响较小,高压水入口角度和收缩段锥角均为30°时流场性能更佳.
Based on the computational fluid dynamic multiphase flow mixture model, the flow field inside the mixing chamber of high pressure water and abrasive mixture chamber was numerically simulated by FLUENT software, and the influence of different feeding methods on the uniformity of flow field was compared. The influences of inlet diameter, inlet diameter of high pressure water, inlet position and angle of high pressure water and angle of taper angle on the mixing uniformity of flow field were analyzed under the condition of high pressure water inlet on both sides. The results of numerical calculation show that the mixing uniformity of the inlet nozzle in the abrasive is better than that of the abrasive side inlet nozzle under the condition of constant inlet velocity.With the increase of the inlet diameter of the abrasive inlet and the high pressure water, However, with the increase of inlet diameter of high-pressure water, the concentration of outlet abrasive first increased and then decreased. The reasonable mass flow ratio of inlet of abrasive and high-pressure water was about 3: 4. Both sides of inlet of high-pressure water The influence on the mixing uniformity of the flow field is small, and the flow field performance is better when the inlet angle of high-pressure water and the taper angle of the contraction section are both 30 °.