Abstract
Engine deposits in exhaust gas passages cause the increase of the pumping loss and the failing of the valve action. Deposits also affect EGR gas temperature in cooled EGR system because their thermal conductivity is low. Therefore, it is necessary to reduce engine deposits in order to improve engine performance. In this study, the influences of the inner surfaces of pipe on deposit formation are investigated by comparing the deposition on SUS304 and two kinds of fluorocarbon polymer, PTFE(polytetrafluoroethylene) and PFA(copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether). Deposits are experimentally formed by smoke produced when diesel fuel is burning in an alcohol lamp or actual exhaust gas emitted from a gasoline engine. The results indicate that different surfaces make difference to the amount and shape of deposits. In addition, it is suggested that small Van der waals force and non-wettability contribute to deposit reduction.
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