介电常数法评定舰用汽轮机油分水性能研究

Investigation on water separation characteristics of ship turbine oils based on dielectric constant method

基于油水混合电介质的介电常数与水分离的变化规律,利用介电常数法评定主流舰用汽轮机油的分水性能,测定油样的破乳化时间和分水后油层的含水量,分析电容变化率与分水时间的关系,以及油层微观形貌,目的是研究介电常数法评定汽轮机油分水性的可靠性。研究发现,介电常数法能够判定舰用汽轮机油的破乳化时间,且具有较好的重复性;因某些汽轮机油组分的抗水洗性能差,油水混合后会在电介质中引入带电离子,致使电容器测量精度受到巨大影响。

Based on the physical relation between dielectric constant and electric capacity volume,and the oilwater mixture dielectric constant and water separation change law,the water separation characteristics of mainstream ship turbine oils were estimated by dielectric constant method.Oils’demulsification time and moisture content of oils layer after oil-water separation were estimated.They were analyzed that the relation between change rate of electric capacity volume and water separation time and SEM of oils layer after oilwater separation.The results shows that it is dielectric constant method that can determine the turbine oils’demulsification time,which has a good repeatability;because of the poor anti water scrubbing performance of a sort of constituent in some turbine oils,changed ions will be brought in the dielectric.