开启涡轮式桨叶的混合效果仿真及实验

发布时间：2018-04-19 14:25

本文选题：开启涡轮式桨叶 + CFD方法　；参考：《华中科技大学》2015年硕士论文

【摘要】：混合是工业生产中最常见的操作之一,搅拌桨是混合设备的关键部件,开启涡轮式桨叶广泛应用于中低粘度流体混合、固体颗粒悬浮、液液分散及聚合反应等过程,是混合操作中最常见的桨叶。本文以开启涡轮式桨叶在搅拌槽内流动的流场为研究对象,通过对开启涡轮式桨叶进行参数化,使用计算流体力学(CFD,Computational Fluid Dynamics)方法进行仿真分析,得到较优的桨叶参数。主要研究内容如下:首先,通过CFD方法对开启涡轮式桨叶在搅拌槽内的流场进行模拟分析,设置固液两相混合模型为Eulerian模型,计算模型采用多重参考系法(MRF方法),得到搅拌槽内流场的速度场和浓度场,并将仿真结果与实验结果对比分析,结果表明二者具有相同的流动区域分布,验证了使用Eulerian混合模型和MRF计算模型模拟开启涡轮式桨叶搅拌槽内流动的正确性和可行性。其次,采用正交试验方法,确定开启涡轮式桨叶参数化正交试验的试验因子和水平,完成正交试验方案设计。采用经过验证的混合模型和计算模型完成正交试验的16组仿真,将仿真数据处理分析,分别以混合时间、混合功率和混合效率数为试验指标进行分析,得到各指标条件下桨叶参数对混合效果的影响主次关系和较优水平组合。最后,搭建了搅拌槽混合实验平台,选取仿真分析中以混合时间为指标分析确定的三组桨叶进行试验验证。按三组组合的桨叶参数加工出桨叶,在混合实验中采取观测点处定量取料方法,对石英砂颗粒计数得到三组桨叶在搅拌槽内混合速率的相对关系。将实验结果和仿真结果对比分析,结果表明混合时间变化趋势相同,认为通过参数化方法仿真得到的桨叶参数是可行和正确的。本文也为桨叶结构优化和放大设计提供了一套参考方法。
[Abstract]:Mixing is one of the most common operations in industrial production. Impeller is the key component of mixing equipment. Turbine blades are widely used in low viscosity fluid mixing, solid particle suspension, liquid-liquid dispersion and polymerization, etc.Is the most common blade in hybrid operation.In this paper, the flow field of an open turbine blade in a stirred tank is studied. By parameterizing the open turbine blade, the computational fluid dynamics (CFD) method is used to simulate and analyze the flow field in a stirred tank, and the optimal blade parameters are obtained.The main research contents are as follows: firstly, the flow field of the open turbine blade in the stirred tank is simulated and analyzed by CFD method, and the solid-liquid two-phase mixing model is set up as the Eulerian model.The velocity field and concentration field of the flow field in the mixing tank are obtained by using the multiple reference system method and MRF method. The simulation results are compared with the experimental results. The results show that the two models have the same flow area distribution.The correctness and feasibility of using Eulerian mixed model and MRF model to simulate the flow in an open turbine blade stirred tank are verified.Secondly, the orthogonal test method is used to determine the experimental factors and levels of the open turbine blade parameterized orthogonal test, and the orthogonal test scheme is designed.The 16 groups of simulation of orthogonal experiment were completed by using the verified mixed model and the calculation model. The simulation data were processed and analyzed, and the mixing time, the mixing power and the mixing efficiency were taken as the test indexes, respectively.The influence of blade parameters on the mixing effect is obtained. The primary and secondary relationships and the optimal horizontal combination are obtained.Finally, the mixing experiment platform of mixing tank is built, and three sets of blades which are determined by mixing time in simulation analysis are selected for experimental verification.According to the parameters of three groups of blades, the relative relationship of mixing rate of three groups of blades in the mixing tank was obtained by quantitative sampling at the observation point and counting of quartz sand particles.By comparing the experimental results with the simulation results, the results show that the mixing time change trend is the same. It is considered that the blade parameters obtained by parameterization method are feasible and correct.This paper also provides a set of reference methods for the optimization and design of blade structure.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.71

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