The structure of a conical nozzle is critical to the gas induction of a venturi ejector. In this work, the effect of nozzle structure on the gas induction was investigated by means of multiphase CFD and validating experiments. Under different structures, the maximal gas induction was obtained through analyzing the nozzle outlet velocity (NOV), nozzle inlet velocity (NIV), as well as nozzle shrinking angle (NSA). The simulated inlet pressure is positively proportional to inlet flow rate, which is in good agreement with experimental results. The simulated results reveal that the inlet pressure and gas induction increase with the increasing NOV. Considering the operational characteristics of centrifugal pump, the recommended NOV is about 21.8 m/s. NIV and NSA show little impact on gas induction and inlet pressure. Based on the pipeline energy consumption, the recommended NIV is the same as the outlet velocity of centrifugal pump. The recommended NSA is about 20o to obtain the maximal gas induction.

中文翻译：

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应用计算流体动力学优化喷射环流反应器文丘里喷射器锥形喷嘴

锥形喷嘴的结构对文丘里喷射器的气体诱导至关重要。在这项工作中，通过多相 CFD 和验证实验研究了喷嘴结构对气体感应的影响。在不同结构下，通过分析喷嘴出口速度（NOV）、喷嘴入口速度（NIV）和喷嘴收缩角（NSA）得到最大气体诱导量。模拟的入口压力与入口流量成正比，与实验结果吻合较好。模拟结果表明，随着 NOV 的增加，入口压力和气体诱导量增加。考虑到离心泵的运行特性，推荐的NOV约为21.8 m/s。NIV 和 NSA 对气体感应和入口压力的影响很小。根据管道能耗，推荐NIV与离心泵出口速度相同。推荐的 NSA 约为 20o，以获得最大的气体感应。