搅拌机械内固液两相流混合的数值模拟研究
发布时间：2018-07-15 21:18
【摘要】：搅拌机械在国民生产的各个部门中应用得很广泛,它能够将两种或多种不同的介质在彼此之间相互分散,从而达到均匀混合,或加速传热和传质过程。而针对于搅拌机械的多相流体力学研究是动力工程中的重要课题。本论文运用GAMBIT前处理软件对搅拌机内部流动空间建立三维实体模型,并进行网格划分,采用FLUENT软件进行模拟计算,得出搅拌机的叶片浸入深度、叶片结构尺寸(长度)和叶片转速变化对搅拌器内部流场和固相颗粒浓度分布的影响因素,从而找到流动规律和最佳的搅拌参数。本文主要研究： (1)搅拌叶片距离水平液面的深度(或离底高度)对固体颗粒体积浓度扩散的影响、搅拌叶片的浸入深度对速度均匀分布的的影响和如何得到最佳流场形态和混合效果； (2)如何正确选取叶片长度,使搅拌罐内部液体获得合适的圆周速度、搅拌机的运行既可靠又经济性的内部流场流动特性。 (3)涡深随叶片转速变化规律,并针对旋转轴位于搅拌罐中心的搅拌机,研究固相体积浓度随叶片转速的变化规,给出了搅拌机的最大转速应控制范围。
[Abstract]:Mixing machines are widely used in various sectors of national production. They can disperse two or more different media among each other, so as to achieve uniform mixing, or accelerate heat and mass transfer process. The study of multi-phase hydrodynamics for agitator is an important subject in power engineering. In this paper, the three-dimensional solid model of the internal flow space of the mixer is established by using gambit pretreatment software, and the mesh division is carried out, and the simulation calculation is carried out by fluent software, and the depth of the blade immersion of the mixer is obtained. The influence factors of blade structure size (length) and blade speed on the flow field and solid particle concentration distribution in the agitator were obtained. The main results of this paper are as follows: (1) the influence of the depth (or the height from the bottom) of the stirring blade to the horizontal liquid surface on the diffusion of the volume concentration of solid particles; How to get the best flow field shape and mixing effect; (2) how to select the blade length correctly, and how to make the proper circumference velocity of the liquid inside the mixing tank, the influence of the immersion depth of the stirring blade on the uniform distribution of velocity and how to get the best flow field shape and mixing effect. The internal flow characteristics of mixer are reliable and economical. (3) Vortex depth varies with blade speed, and the change of solid phase volume concentration with blade speed is studied for the mixer with rotating shaft located in the center of agitating tank. The maximum rotational speed of mixer should be controlled.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK12
本文编号：2125414
[Abstract]:Mixing machines are widely used in various sectors of national production. They can disperse two or more different media among each other, so as to achieve uniform mixing, or accelerate heat and mass transfer process. The study of multi-phase hydrodynamics for agitator is an important subject in power engineering. In this paper, the three-dimensional solid model of the internal flow space of the mixer is established by using gambit pretreatment software, and the mesh division is carried out, and the simulation calculation is carried out by fluent software, and the depth of the blade immersion of the mixer is obtained. The influence factors of blade structure size (length) and blade speed on the flow field and solid particle concentration distribution in the agitator were obtained. The main results of this paper are as follows: (1) the influence of the depth (or the height from the bottom) of the stirring blade to the horizontal liquid surface on the diffusion of the volume concentration of solid particles; How to get the best flow field shape and mixing effect; (2) how to select the blade length correctly, and how to make the proper circumference velocity of the liquid inside the mixing tank, the influence of the immersion depth of the stirring blade on the uniform distribution of velocity and how to get the best flow field shape and mixing effect. The internal flow characteristics of mixer are reliable and economical. (3) Vortex depth varies with blade speed, and the change of solid phase volume concentration with blade speed is studied for the mixer with rotating shaft located in the center of agitating tank. The maximum rotational speed of mixer should be controlled.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK12
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，本文编号：2125414
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