分流对冲与多级扩容组合式集沙仪内风沙分离规律研究

发布时间：2018-03-11 08:34

本文选题：集沙仪　切入点：集沙效率　出处：《农业机械学报》2017年03期 　论文类型：期刊论文

【摘要】：为揭示风沙在集沙仪内部的分离规律,以分流对冲与多级扩容组合式集沙仪风沙分离器为研究模型,通过Fluent数值模拟和微型风洞试验,对风沙分离器内单相流场和气固两相流场进行了分析。在阐释气流降速机理的基础上,进一步分析了气流降速和入口气流中沙尘所占体积分数对风沙分离的影响,并通过分析沙尘的运动规律,阐述了不同粒径沙尘受流场影响的情况。结果表明,气流大幅降速是实现风沙分离的最有效方法,而引起气流速度大幅降低的主要原因是较大值的湍动能场的大范围形成;对于风沙流,当沙尘含量增高时,降速效果变好,风沙分离效果也变好;当沙尘含量进一步增高时,降速及风沙分离效果则变化不大;对于分流对冲与多级扩容组合式集沙仪,当沙尘受强风以下风力影响时,粒径小于0.032 41 mm的沙尘较易受到流场的诱导,受惯性运动的影响较小,从排气口排出的可能性较大,是影响风沙分离效率和集沙效率的主要粒子。
[Abstract]:In order to reveal the sand in the sand inside the instrument set separation rules, to hedge and multistage expansion combined shunt trap sand separator as the research model, through numerical simulation of Fluent and micro wind tunnel test on sand separator in single-phase flow field and gas-solid two-phase flow field was analyzed. Based on the interpretation of the mechanism of reducing speed of airflow, further analysis the air flow in the entrance of dust reduction of speed and the volume fraction of the influence of sand dust separation, and through the movement of the dust, expounds the different particle size of dust by flow field. The results show that the large amplitude flow deceleration is the most effective method to realize the separation of the sand, and the main cause of air velocity significantly reduced the larger value of the turbulent kinetic energy field for large scale formation; sand flow, when the dust content increased when the speed reduction effect becomes better, the sand separation effect is good; when the dust content further With the rise of the descending speed and the effect of sand separation changed little; for hedging and multistage expansion combined shunt sand collector, when the dust by the strong winds below the influence of wind, dust particle size less than 0.03241 mm are more susceptible to flow induced, less affected by inertial motion, from the possibility of exhaust discharge is larger. The main effect of sand particle separation efficiency and sand collection efficiency.

【作者单位】：内蒙古农业大学机电工程学院;泰山学院机械与工程学院;
【基金】：国家自然科学基金项目(41361058、41161045)
【分类号】：S237;S157.1

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