螺旋叶片式水力旋流器数值模拟及结构优化

发布时间：2018-01-13 16:26

本文关键词：螺旋叶片式水力旋流器数值模拟及结构优化　出处：《沈阳航空航天大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来随着我国经济的飞速发展与社会的不断进步,石油已经成为人们的日常生产生活之中无可替代的必需品。当今我国的石油开采工作还在不断进展当中,大多数主力油田采出石油的含水率也在急剧增加。含油污水是一种对环境极具破坏性的污染源,因此,含油污水的处理不仅对保护水资源乃至维持地球的生态平衡都有着非同寻常的意义。采用旋流器来进行含油污水处理的方法始于二十世纪八十年代末,并于二十世纪九十年代初期开始在国内外获得了广泛的应用。本文对近年来的螺旋叶片式水力旋流器的研究进展做出了整体的概括,并在传统的螺旋叶片式旋流器的基础上,以提高旋流器分离效率为目的,通过对其溢流管尾部进行割缝处理的方式,设计出一种新型的割缝螺旋叶片式水力旋流器。利用Creo3.0建模软件对已设计出的旋流器进行实体建模,之后使用ANSYS前处理软件Meshing对模型进行网格划分,最后导入到计算流体力学(Fluent)软件中来进行数值模拟计算分析。经Fluent模拟结果表明,在同等条件下溢流管直径取20mm、割缝长为25mm、割缝宽度取2mm和割缝数量为8时,内部流场速度分布对称性较好,溢流管油相体积分数较高,不易发生紊流现象,且综合分离性能最好,分离效率可达94.5%。为使旋流器的性能再次得到提升,再次对溢流管割缝进行排列优化。经数值模拟结果表明改进后的模型较比之前的模型分离效率有所提高,其分离效率最高可达96.7%。最后通过实验验证,得到旋流器实际的分离效率为96.2%,虽然数值模拟和实验结果有一些差异,这是因为理想的模拟边界条件设定与实验条件存在一定差异所致,且误差值微乎其微直接可以忽略不计。观察实验得出的百分比变化趋势折线图发现,实际实验的曲线与数值模拟曲线较为吻合,同时正交试验优选后的缝螺旋叶片式旋流器结构分离性能稳定较好,证明了通过正交优化试验法对旋流器溢流管进行割缝的设计方案是可以实现的。
[Abstract]:In recent years, with the rapid development of our economy and social progress, oil has become an irreplaceable necessity in people's daily production and life. The water cut of oil produced in most major oil fields is also increasing sharply. Oily sewage is a very destructive pollution source to the environment, therefore. The treatment of oily sewage is of great significance not only to protect water resources but also to maintain the ecological balance of the earth. The method of using hydrocyclone to treat oily sewage began at the end of 1980s. Since the beginning of 1990s, it has been widely used at home and abroad. In this paper, the research progress of spiral vane hydrocyclone in recent years is summarized. On the basis of the traditional spiral vane cyclone, in order to improve the separation efficiency of the cyclone, the slit treatment of the tail of the overflow tube is carried out. A new type of slit spiral vane hydrocyclone is designed and the solid model of the designed hydrocyclone is built by using Creo3.0 modeling software. Then we use ANSYS pre-processing software Meshing to mesh the model. Finally, the numerical simulation and analysis are carried out by the software of computational fluid dynamics. The Fluent simulation results show that the diameter of the overflow pipe is 20mm under the same conditions. The length of slit is 25mm, the width of slit is 2mm and the quantity of slit is 8:00. The velocity distribution of internal flow field is symmetrical, and the volume fraction of oil phase of overflow pipe is higher, so it is not easy to occur turbulence phenomenon. And the comprehensive separation performance is the best, separation efficiency can reach 94.5. in order to make the performance of the cyclone to be improved again. The numerical simulation results show that the improved model has higher separation efficiency than the previous model, and the maximum separation efficiency can reach 96.7. finally, the experimental results show that the improved model can improve the separation efficiency of the overflow pipe slit. Finally, the experimental results show that the improved model has higher separation efficiency than the previous model. The actual separation efficiency of hydrocyclone is 96.2, although there are some differences between the numerical simulation and the experimental results, this is due to the difference between the ideal simulation boundary conditions and the experimental conditions. And the error value can be ignored directly. The curve of the actual experiment is in good agreement with the numerical simulation curve. At the same time, the structure separation performance of slit spiral vane hydrocyclone is stable after orthogonal test, which proves that the design scheme of slit cutting for overflow tube of cyclone can be realized by orthogonal optimization test.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X741;TE937

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