Abstract
To find a basic principle of residual fuel combustion, tests were conducted on heavy fuels of 34.4 cSt and 75.9 cSt at 50°C (200 and 500 sec RW No. 1 at 100°F) using small-sized, high speed diesel engines with a cylinder bore of 110 mm, a stroke of 125 mm and speeds of 2500 and 2600 rpm. Using a natural-aspirated engine, the effects of individual factors on engine performance were confirmed by changing the fuel injection mode, the cooling water temperature, the suction air flow quantity and the temperature respectively. Then using a turbocharged engine, the optimum combustion method was established by chiefly improving the fuel injection mode. Fuel combustion was evaluated by means of accurate indicator diagrams obtained by the CB-366 combustion analyzer. The reliability and durability of the engines were confirmed through thermal load analysis based on temperature measurements of the combustion chamber walls.
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