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The prior study for RI(radical ignition) method was carried out in the experimental ways using a CVC(constant volume combustor) and applying the basic results from the CVC to a real engine. The rapid combustion and the expansion of the combustible lean limit of RI method were realized by the 0.45% sub-chamber volume of the overall combustion chamber in the CVC. But the gasoline fueled RI engine showed the severe problem of high cycle variation due to the difficulty of the residual gas scavenge in the sub-chamber from the former cycle. To solve this problem, CNG fuel was directly supplied into the sub-chamber instead of the port fuel injection. A DI Diesel Engine with the same specifications used in a previous study was modified to a RI-CNG Engine, and injection pressure was constantly kept at 6㎫ by a regulator. This study was performed to investigate the effects of injection timings on the combustion and performances of the RI-CNG Engine. The excess air ratio was varied from 1.0 to the lean limit at the condition of 50% throttle open rate and 1700rpm. The combustion characteristics of the RI-CNG engine such as in-cylinder pressure, indicated thermal efficiency, cycle-by-cycle variation, combustion duration and emissions were investigated.

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2. 실험장치
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UCI(KEPA) : I410-ECN-0101-2010-556-001483278