波纹板内气液分离流场的数值模拟研究

发布时间：2018-02-25 01:07

本文关键词： 波纹板分离性能数值模拟实验研究　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：波纹板是气液分离器内重要的分离元件,其通道内的流体流动是一种涉及气液两相相互作用,并且伴随液滴的聚结和破碎等许多复杂物理现象的两相分离运动。国内对波纹板的研制主要依靠经验设计和反复实验,目前对气液两相在通道内的流体力学特性以及分离过程中的理论化数学模型均鲜有报道。基于液滴动力学理论,对波纹板通道内液滴的行为进行了受力分析,将横混模型引入波纹板气液分离理论的研究中,建立了描述通道内流动过程的数学模型,推导出波纹板分离效率及压降的理论计算公式;采用计算流体力学软件FLUENT中适合弯曲流线流动的RNG k-ε模型,对液滴粒径按Rosin-Rammler函数分布的携液气体在不同入口气流速度、板间距及波纹倾角组合下的流场进行了模拟,考虑到气流与液滴之间的相互作用,运用DPM离散相模型对液滴的运动进行跟踪计算,得到各参数对分离效率、压降的影响以及液滴的运动轨迹;研制开发波纹板气液分离性能测试实验台,可实现最高气流速度为18m/s,实验台雾化系统稳定,雾滴主要分布在100μm以下,可以对不同板间距、波纹倾角的波纹板进行分离性能测试。实验针对波纹板的分离效率和压降这两个主要指标与数值模拟结果进行对比,从而验证了理论计算模型和数值模拟方法的可靠性。论文最后提出波纹板倾角参数设计时不宜超过45°等一些建议。将理论解析、数值模拟和实验测试三种方法结合起来,对波纹板内气液两相分离过程进行了深入的理论和实验研究,较为全面的掌握了波纹板气液分离过程中的客观规律,这不仅利于高效波纹板分离元件的开发,而且对气液分离器向高效、紧凑型发展有重要的意义。
[Abstract]:Corrugated plate is an important separation element in gas-liquid separator. The fluid flow in its channel is a kind of gas-liquid two-phase interaction. And the two-phase separation motion of many complicated physical phenomena, such as coalescence and breakage of droplets. The development of corrugated plates in China mainly depends on the experience design and repeated experiments. At present, there are few reports on the hydrodynamic characteristics of gas-liquid two-phase in the channel and the theoretical mathematical model in the separation process. Based on the droplet dynamics theory, the behavior of the droplet in the corrugated plate channel is analyzed. The transverse mixing model is introduced into the theory of gas-liquid separation of corrugated plates, and a mathematical model describing the flow process in the channel is established, and the theoretical calculation formulas for the separation efficiency and pressure drop of the corrugated plates are derived. A RNG k- 蔚 model suitable for bending streamline flow in computational fluid dynamics software FLUENT is used to simulate the flow field of liquid carrying gas distributed according to Rosin-Rammler function under different inlet airflow velocity, plate spacing and corrugated dip angle. Considering the interaction between the air flow and the droplet, the DPM discrete phase model is used to track the droplet motion, and the influence of the parameters on the separation efficiency, the pressure drop and the droplet trajectory is obtained. An experimental platform for testing the gas-liquid separation performance of corrugated plates is developed. The maximum gas velocity is 18 m / s. The atomization system is stable, the droplets are mainly distributed below 100 渭 m, and different plate spacing can be obtained. The separation performance of corrugated corrugated plate with dip angle is tested. The separation efficiency and pressure drop of corrugated plate are compared with the results of numerical simulation. The reliability of the theoretical calculation model and the numerical simulation method is verified. Finally, some suggestions are put forward that the design of the bellows inclination angle should not exceed 45 掳. The three methods of theoretical analysis, numerical simulation and experimental test are combined. The theoretical and experimental study on the gas-liquid two-phase separation process in the corrugated plate is carried out, and the objective law of the gas-liquid separation process of the corrugated plate is comprehensively grasped, which is not only conducive to the development of the high-efficiency corrugated plate separation element. Moreover, it is of great significance to the development of gas-liquid separator to high efficiency and compact type.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028

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