Huang Zhuoyong,Hu Tiegang,Zhou Longbao,Liu Shenghua,Dong Hongyi
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:The mutual solubility characteristics of dimethyl ether£¨DME£© and different kinds and proportions of lubricity improvers were investigated.The improvement of the lubricating characteristics and the wear of the precision pairs of fuel system also was studied.At the same time,the change of the emission characteristics of engine operating on DME mixed with different lubricity improvers was analyzed.These three aspects are basic and critical for selecting the lubricity improver for DME powered compression ignition engine.It is found that vegetable oils are good improvers for improving the DME lubricity.In our experimental study,the curves of the critical mutual solubility temperatures between DME and three kinds of lubricity improvers were obtained.Thus,the different lubricity improvers with appropriate proportion at different ambient temperatures and seasons,in which the lubricity improver can absolutely dissolve into DME,can be selected for DME engine.The experiment result also shows that the emission characteristics of the engine are not worsened after adding small proportion lubricity improvers into DME£®
Keywords:dimethyl ether;mutual solubility;wear;lubricity improver