Research on the Wear Characteristics of Injection Pump in Di-Engine Fueled with Dimethyl Ether

Abstract:

Fuel injection pumps of Diesel engine are lubricated primarily by the fuel itself, so the fuel should have lubricity. It has been proved that diesel engine has some extraordinary virtues when fueled with dimethyl ether (DME), but the precision pairs (plunger and needle valve pairs) of the fuel system will wear badly when pure DME is used. As well known, some vegetable oil contains fatty acid, which possess polar-headed and long straight chain in molecular, so vegetable oils should be good boundary lubrication additives. In this paper, the lubricity of pure DME and DME added with castor oil and rap oil as lubrication additive were detected. The endurance test for each kind of fuel was carried out for 160 hours. The results show that, By adding 2% castor oil or 6% rap oil into DME, the surface of plunger is no obvious wear,the maximum supply pressure of pump declines less than 6 MPa and 3MPa correspondingly, the decompression time of delivery valve decrease less than 10 seconds and 5 seconds respectively. The results demonstrate that the lubrication performance of dimethyl ether will be improved greatly by adding right amount of certain vegetable oil.

• Periodical: Advanced Materials Research (Volumes 724-725)
• Pages: 1249-1253
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.724-725.1249
• Online since: August 2013
• Authors: Wei Li, Fan Bin Li, Wen Wang
• Keywords: Additive, DME, Lubrication, Precision Pairs, Wear

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