穿流式刚-柔组合搅拌桨强化混合澄清槽内油-水两相混沌混合

发布时间：2018-03-19 08:55

本文选题：混合澄清槽　切入点：刚-柔组合　出处：《化工学报》2017年02期 　论文类型：期刊论文

【摘要】：运用Lab View和Matlab软件分别采集和处理穿流式刚-柔组合搅拌桨扰动澄清槽中油-水两相流体内部的压力脉动信号,得出的最大Lyapunov指数(LLE)和多尺度熵(MSE),反映流体内部的混沌程度;同时采用流场可视化技术观测流体混合状态。结果表明,相比于刚性组合桨,穿流式刚-柔组合搅拌桨通过穿流孔与柔性部分的共同作用改变流场的结构和能量耗散方式,使流体的混沌程度和混合状态都优于刚性组合桨。当转速为88 r·min-1时,流体的混沌混合都达到最佳状态,各实验条件下的LLE均大于零,表明流场混合体系已进入混沌状态,且穿流式刚-柔组合搅拌桨体系的MSE明显高于刚性组合桨体系,说明穿流式刚-柔组合搅拌桨的混合效果优于刚性组合桨。另外,柔性片上穿流孔的数目和柔性桨叶的厚度对流场的混沌特性也有明显的影响。
[Abstract]:The Lab View and Matlab software are used to collect and process the pressure pulsation signal of the oil-water two-phase fluid in the tank with the impeller disturbance and the maximum Lyapunov exponent and the multi-scale entropy are obtained to reflect the degree of chaos in the fluid. At the same time, the flow field visualization technique is used to observe the mixing state of the fluid. The results show that the structure and energy dissipation of the flow field are changed by the interaction between the perforating hole and the flexible part of the impeller, compared with the rigid impeller. The chaotic degree and mixing state of the fluid are better than that of the rigid combination propeller. When the rotational speed is 88 r 路min-1, the chaotic mixing state of the fluid reaches the optimal state, and the LLE of the fluid is greater than zero under each experimental condition, which indicates that the mixing system of the flow field has entered the chaotic state. The MSE of the impeller system is obviously higher than that of the rigid impeller system, which indicates that the mixing effect of the impeller is better than that of the rigid impeller. The number of holes in the flexible blade and the chaotic characteristics of the flow field in the thickness of the flexible blade are also significantly affected.
【作者单位】：重庆大学化学化工学院;化学工程联合国家重点实验室清华大学化学工程系;
【基金】：国家自然科学基金项目(21576033) 清华大学化学工程联合国家重点实验室开放课题项目(SKL-ChE-15A02)~~
【分类号】：TQ027.1

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