回转表面间油雾流动的仿真及实验研究

发布时间：2018-02-04 01:38

本文关键词： 油雾间隙回转速度粒径速度分布　出处：《东北大学》2012年硕士论文　论文类型：学位论文

【摘要】：研究回转表面的不同工作参数对流经其间油雾粒径的影响,对于降低甚至消除油雾润滑现场残余油雾对空气及人员的危害将产生很大的积极推动作用。本文结合工业应用现场,通过仿真与实验相结合的方式,研究了不同相对回转速度下,油雾颗粒流经两回转表面构成的间隙后粒径变化及速度分布情况。通过改变影响粒径变化的另外两个主要影响因素——不同进气流量和间隙尺寸条件,进一步研究相对回转速度对粒径变化的影响,尤其是高速回转对油雾粒径的影响。仿真和实验是建立在对油雾颗粒在壁面间的运动分析和相关数值仿真模型及仿真计算方法研究的基础上。通过理论分析明确相对回转速度、进气流量及间隙尺寸条件对油雾粒径变化的主要影响作用,并据此建立了Fluent仿真模型并搭建了实验台与仿真研究对比进行。通过对仿真及实验数据进行分析可知,随着间隙表面相对回转速度的增加,间隙出口处的油雾粒径越来越大,在进气流量为3m3/h情况下,当回转速度达到4900r/min时,现有颗粒粒度测量仪就已经检测不到5μm以下油雾颗粒的存在。并且油雾颗粒在流经回转表面构成的间隙后会发生明显沉降,出口周围散逸的油雾颗粒也越来越少。其他条件都相同时,随着进气流量的增加,环形间隙入口和出口处的油雾粒径都在减小,油雾流经环形间隙前后的粒径变化也不断减小,相对回转速度对粒径变化的影响也越来越小。间隙尺寸对油雾粒径的影响根据转速的不同而发生变化,在相对回转速度为0时,间隙长度增大,流经间隙后的油雾粒径变大；间隙高度减小,流经间隙后的油雾粒径变大。随着转速的增加,虽然还是产生同样规律变化,但间隙尺寸对油雾粒径的影响程度变得越来越小,当转速达到6800r/min及以上时,这种影响几乎可以忽略不计,这时主要是相对回转速度对粒径变化产生影响。
[Abstract]:The influence of different working parameters on the particle size of oil mist was studied. In order to reduce or even eliminate the harm of residual oil mist to air and personnel, this paper combines the industrial application field with simulation and experiment. The relative rotation velocities are studied. The particle size change and velocity distribution after the oil mist particles flow through the clearance formed by the two rotating surfaces. By changing the other two main influencing factors-different inlet air flow rate and clearance size conditions. The influence of relative velocity of rotation on particle size change, especially the influence of high speed rotation on the particle size of oil mist was further studied. The simulation and experiment are based on the analysis of the motion of the oil mist particles between the walls and the related numerical simulation model and the simulation calculation method. The relative velocity of rotation is determined by theoretical analysis. The influence of inlet air flow rate and clearance size on the variation of oil mist particle size is studied. Based on this, the Fluent simulation model is established and the experimental bench is built and compared with the simulation research. Through the analysis of the simulation and experimental data, it can be seen that with the increase of the relative rotational velocity of the clearance surface, the particle size of the oil mist at the clearance exit becomes larger and larger, under the condition of the inlet air flow rate of 3 m3 / h. When the speed of rotation reaches 4900r / min. The existing particle size measurement instrument can not detect the existence of oil mist particles below 5 渭 m, and the oil mist particles will settle obviously after flowing through the gap formed by the rotating surface. There are fewer and fewer particles of oil mist around the exit. When other conditions are the same, with the increase of inlet air flow rate, the diameter of oil mist at the inlet and outlet of annular clearance is decreasing, and the change of particle size of oil mist before and after flowing through annular clearance is also decreasing. The effect of the clearance size on the particle size of the oil mist varies according to the rotational speed, and the gap length increases when the relative rotation speed is 0:00. The particle size of the oil mist becomes larger after flowing through the gap. With the increase of rotational speed, the effect of clearance size on the particle size of oil mist becomes smaller and smaller. When the rotational speed reaches 6800r / min and above, this effect is almost negligible, and it is mainly the relative speed of rotation that has an effect on the change of particle size.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH11;TP391.9

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