本文選題：開啟渦輪式槳葉 + CFD方法　； 參考：《華中科技大學》2015年碩士論文

【摘要】：混合是工業(yè)生產(chǎn)中最常見的操作之一,攪拌槳是混合設(shè)備的關(guān)鍵部件,開啟渦輪式槳葉廣泛應(yīng)用于中低粘度流體混合、固體顆粒懸浮、液液分散及聚合反應(yīng)等過程,是混合操作中最常見的槳葉。本文以開啟渦輪式槳葉在攪拌槽內(nèi)流動的流場為研究對象,通過對開啟渦輪式槳葉進行參數(shù)化,使用計算流體力學(CFD,Computational Fluid Dynamics)方法進行仿真分析,得到較優(yōu)的槳葉參數(shù)。主要研究內(nèi)容如下:首先,通過CFD方法對開啟渦輪式槳葉在攪拌槽內(nèi)的流場進行模擬分析,設(shè)置固液兩相混合模型為Eulerian模型,計算模型采用多重參考系法(MRF方法),得到攪拌槽內(nèi)流場的速度場和濃度場,并將仿真結(jié)果與實驗結(jié)果對比分析,結(jié)果表明二者具有相同的流動區(qū)域分布,驗證了使用Eulerian混合模型和MRF計算模型模擬開啟渦輪式槳葉攪拌槽內(nèi)流動的正確性和可行性。其次,采用正交試驗方法,確定開啟渦輪式槳葉參數(shù)化正交試驗的試驗因子和水平,完成正交試驗方案設(shè)計。采用經(jīng)過驗證的混合模型和計算模型完成正交試驗的16組仿真,將仿真數(shù)據(jù)處理分析,分別以混合時間、混合功率和混合效率數(shù)為試驗指標進行分析,得到各指標條件下槳葉參數(shù)對混合效果的影響主次關(guān)系和較優(yōu)水平組合。最后,搭建了攪拌槽混合實驗平臺,選取仿真分析中以混合時間為指標分析確定的三組槳葉進行試驗驗證。按三組組合的槳葉參數(shù)加工出槳葉,在混合實驗中采取觀測點處定量取料方法,對石英砂顆粒計數(shù)得到三組槳葉在攪拌槽內(nèi)混合速率的相對關(guān)系。將實驗結(jié)果和仿真結(jié)果對比分析,結(jié)果表明混合時間變化趨勢相同,認為通過參數(shù)化方法仿真得到的槳葉參數(shù)是可行和正確的。本文也為槳葉結(jié)構(gòu)優(yōu)化和放大設(shè)計提供了一套參考方法。
[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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ051.71

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