Abstract
In this paper, test results used water-emulsified fuel are reported. We used a high-speed diesel engine with 250mm-cylinder bore, 250mm-piston stroke. Tests were carried out varying the water-content of emulsion (0-110%) with MDO (Marine Diesel Oil) and MFO (Marine Fuel Oil), in order to confirm engine performance, fuel injection characteristics, exhaust gas characteristics and thermal load characteristics.The followings have been found.(1) At about 30% water-content, fuel consumption with MDO was improved, but fuel consumption with MFO was not improved.(2) The engine performance with MFO deteriorates rapidly once the water-content exceed 90%.(3) In the characteristics of fuel injection, there is a large difference between MDO and MFO.(4) In MFO, NOx emission is more than MDO, but the reduction rates of NOx emission achieved by water addition are the same for both fuel oil.(5) Cylinder liner temperatures are the same level for MDO and MFO burning.
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