桨叶层数不同对搅拌槽内流动场影响毕业论文.doc

分类号 单位代码 密 级 学 号 学生毕业设计 题 目 桨叶层数不同 对搅拌槽内流动场的影响 作 者 院 (系) 专 业 指导教师 答辩日期 年 月 日  榆 林 学 院 毕业设计诚信责任书 本人郑重声明：所呈交的毕业设计，是本人在导师的指导下独立进行研究所取得的成果。毕业设计中凡引用他人已经发表或未发表的成果、数据、观点等，均已明确注明出处。尽我所知，除文中已经注明引用的内容外，本论文不包含任何其他个人或集体已经公开发表或撰写过的研究成果。对本文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。 本人毕业设计与资料若有不实，愿意承担一切相关的法律责任。 论文作者签名: 年 月 日  摘 要 搅拌设备广泛应用于工业生产中，如石油、化工、制药、食品、采矿、冶金、废水处理等领域。搅拌操作是工业反应过程中的重要环节，在促进槽内物料流动，使得搅拌槽内物料均匀分布的同时，能够增大传热和传质系数，加速反应的进行。因此，研究搅拌槽的流动性能在工业生产中具有重要意义。 本文采用计算流体力学（CFD）对搅拌槽内的流动场进行了数值模拟，CFD），数值模拟  Numerical Analysis of the Flow Field of Stirred Tank with Different Impeller Layers ABSTRACT Mixing equipments are widely used in industrial production, such as petroleum, chemical industry, pharmaceutical industry, foodstuff, mining, metallurgy, waste-water treatment, etc. Stirring operation is an important part of the industry reaction process, it can promote the flowing of materials and make materials distributing evenly in the stirred tank. At the same time, it can increase the coefficient of heat and mass transfer and accelerate the reaction.Therefore, it has an important significance in industrial production to study the flow characteristics of stirred tank. Three-dimensional flow fields in stirred tank has been simulated numerically by utlizing Computational Fluid Dynamics (CFD), when the impeller layers are different, the flow characteristics and the mixing power demand of 6DT, 6PDTU and 6PDTD is researched. The results indicate that: With the same type of impeller, the flow field can be changed due to the different impeller layers. The liquid with dual impellers is mixed evenly than single impeller and it costs maximum power demand. (1) As for the 6DT with single impeller, four symmetrical vortexes are formed in the stirred tank and the