An Experimental Study on the Performance of a Multifuel Engine : Part 5, Effect of Exhaust Throttling

概要

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In order to improve the multifuel capability o the diesel engine, we operated it by means of the exhaust throttling. By this technique, it was found out that the pressure of the residual gas was increased, and this made it possible to reduce that ignition delay because of a decrease in the quantity of the intake air and the rising temperature in the working gas at the end of compression. According to the experiment, utilizing a low cetane number fuel as automotive gasoline, the same combustibility as we could obtain with utilising gas oil was obtained, because the residual gas pressure was rose to about 3.0 ata. But, with a throttling of the exhaust has, fuel consumption was increased especially in a heavier load range. And yet, the smoke limited output was decreased and the engine noise became louder, because the pumping loss during the suction and exhaust stroke was increased and the charging efficiency was decreased. However, in getting such a combustibility, these are not considerably important. Because, the difficulties in running with a low cetane number fuel occure mainly at the lighter load range.
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