Investigation of characteristics of charge injection type of electrostatic ol filter

电荷注入式静电过滤器特性研究

• 批准号: 18560132
• 负责人: YANADA Hideki
• 金额: $ 2.44万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560132/
• 关键词: Electrostatic oil filter; Charge injection; Lubricating oil; Ion drag; Collector; Numerical simulation; Reuse; Contamination contro; 絶縁性液体; 直流電界

The filtration speed of charge injection type of electrostatic oil filter is increased with the increase in the number density of projections, the applied voltage, and in the oil temperature and with the decrease in the electrode spacing but the speed tends to be saturated at higher applied voltages and oil temperatures. In this investigation, in order to make clear those characteristics, the flow field is measured using a two-dimensional filter model. The flow and electric fields are simulated by numerical analysis and are compared between simulation and experiment. In addition, the effects of the shape and position of collectors, which are inserted between the electrodes to capture conductive contaminants like metallic wear debris, on the filtration speed are investigated. The following results are obtained:(1) Ion drag flow is generated from the projection tips of the emitter electrode towards the smooth electrode due to the action of Coulomb force exerted on the injected charges. T … More he magnitude of the flow is increased with increasing applied voltage, is decreased with decreasing electrode spacing, and is larger for negative charge injection than for positive charge injection.(2) More charges are apt to be injected and then faster ion drag flow is generated at higher oil temperatures.(3) When the layer of particles captured on the smooth electrode is relatively thick and the ion drag flow is relatively fast, part of the particles captured on the smooth electrode is detached by the action of the ion drag flow.(4) Taking the above results into account, the ion drag flow is-considered to be the principal cause of the saturation of the filtration speed at higher applied voltages and temperatures.(5)Numerical simulation results qualitatively agree with measured ones. It is expected that the flow and electric fields in a real three-dimensional electrostatic filter can be predicted by improving the simulation accuracy.(6)The filtration speed depends on the shape and position of the collectors inserted between the electrodes. It is useful to insert the collectors at the positions of the projection tips of the emitter electrode. Less

荷电式静电滤油器的过滤速度随着投影数密度、外加电压和油温的增加而增加，随着电极间距的减小而增加，但在较高的外加电压和油温下，过滤速度趋于饱和。在本研究中，为了弄清这些特性，采用了二维过滤模型对流场进行了测量。对流场和电场进行了数值模拟，并与实验结果进行了比较。此外，还研究了电极间的收集器形状和位置对过滤速度的影响，这些收集器用于捕获金属磨屑等导电污染物。结果表明：(1)由于注入电荷受到库仑力的作用，发射极电极的投影尖端向光滑电极的方向产生了离子拖曳流动。T…随着外加电压的增加，流动的大小增加，随着电极间距的减小，流动的幅度减小，并且负电荷注入比正电荷注入更大。(2)在较高的油温下，更容易注入更多的电荷，从而产生更快的离子拖曳流动。(3)当光滑电极上捕获的颗粒层相对较厚，离子拖曳流动相对较快时，在离子拖曳流动的作用下，在光滑电极上捕获的部分颗粒被分离。(4)考虑到上述结果，离子阻力流被认为是在较高电压和温度下过滤速度饱和的主要原因。(5)数值模拟结果与实测值定性吻合。通过提高模拟精度，可以对真实三维静电过滤器内的流场和电场进行预测。(6)过滤速度取决于电极间收集器的形状和位置。在发射极电极的凸起尖端的位置插入集电极是有用的。较少

项目成果

Experimental and numerical analyses of two-dimensional ion drag flow field (in Japanese)

二维离子拖曳流场的实验与数值分析（日文）

• 发表时间: 2008
• 作者: Yanada;H.;Tran;K;D. Kojima Y
• 通讯作者: D. Kojima Y

Fundamental investigation of charge injection type of electrostatic oil filter(effects of mechanical factors on filtration speed)

电荷注入式静电滤油机基础研究（机械因素对过滤速度的影响）

• 发表时间: 2007
• 作者: Tran K. D.;Tomizawa;M. and Yanada;H.
• 通讯作者: H.

電荷注入式静電フィルタ内の電場と流れ場の解析

电荷注入静电过滤器中的电场和流场分析

• 发表时间: 2007
• 作者: Yanada;H.;Tran;K;D.;Okamoto;T;赤上 陽一;加藤昌彦;柳田秀記・Tran Khanh Duong・小島 優
• 通讯作者: 柳田秀記・Tran Khanh Duong・小島 優

Fundamental investigation of charge injection type of electrostatic oil filter (effects of mechanical factors on filtration speed)

电荷注入式静电滤油机基础研究（机械因素对过滤速度的影响）

• 发表时间: 2007
• 作者: Tran;K. D.;Tomizawa;M.;Yanada;H
• 通讯作者: H

Fundamental investigation of charge-injection type of electrostatic oil filter (effects of configuration and material of electrode) (in Japanese)

电荷注入式静电滤油器的基础研究（电极结构和材料的影响）（日语）

• 发表时间: 2006
• 作者: Yanada;H.;Tran;K. D. Tomizawa;M
• 通讯作者: M