油气工况下提升管出口旋流快分系统性能的数值研究

为促进旋流快分(SVQS)系统的工业应用、准确评估其性能，参照国家标准设计了一系列不同密度、黏度的油气模型，并采用商用软件FLUENT 2019 R3对一套Φ600 mm×3150 mm的SVQS系统进行了流动模拟和可行性验证。用单因素变量法分别研究了油气性质对系统无量纲切向速度和压降的影响；用标量输运方程分析了油气在系统内的停留时间分布规律。结果表明，无量纲切向速度随油气密度增加或黏度降低而变大；无量纲最大切向速度随油气密度增加或黏度减小而呈对数递增，最大为0.912；密度越大、黏度越小的油气在SVQS系统内的平均停留时间越短，最短可达6.279 s；压降、阻力系数不仅与系统的结构参数相关，也与油气黏度呈对数关系。拟合得到了与油气参数相关的无量纲切向速度、压降和阻力系数函数式，具有较好的普适性，可为SVQS系统的结构优化提供参考。

Numerical study on performances of a super vortex quick separation system at riser outlet under oil steam conditions

In recent years, there are many reports on super vortex quick separation (SVQS) system using air instead of oil steam, but the performance parameters such as separation efficiency are not very accurate, moreover the influence of oil steam properties on the performance of the system has not been studied. In order to promote the industrial application of SVQS system and accurately evaluate its performance, the flow fields at a series of oil steam model with different densities and viscosities in a ?600 mm×4150 mm SVQS system were simulated by the commercial software FLUENT 2019 R3. The influences of oil steam properties on the dimensionless tangential velocity and pressure drop were studied respectively by single factor analysis. The distribution law of residence time of different oil steam in SVQS were analyzed by employing the scalar transport equation. The simulation result showed that the dimensionless tangential velocity of oil steam in SVQS increased as the density increasing or decreasing of viscosity and the maximum dimensionless tangential velocity can reach 0.912. Both density and viscosity had logarithmic function relations with the dimensionless maximum tangential velocity. The residence time of oil steam in SVQS reduced with the increasing of density of oil steam or the decrease of viscosity that the minimum average residence time was 6.279 s. It was found that the pressure drop and drag coefficient were not only affected by the structural parameters of the SVQS system, but also impacted by the viscosity of oil steam. Both pressure drop and drag coefficient had a logarithmic function relationship with the viscosity of oil steam. Meanwhile, the formulas of dimensionless tangential velocity, pressure drop and resistance coefficient related to oil steam parameters were obtained by fitting, which had good universality and can provide data for the structural optimization of SVQS system.