Abstract
This experimental study was carried out to obtain fundamental data on a radical engine operation using a radical induced injection method to expect both low emission and high efficiency due to rapid bulk combustion. Two kinds of experiment were conducted for the purpose. First of all, the basic experiments were conducted to confirm rapid bulk combustion by using a radical induced injection method in a constant volume chamber. In this experiment, the higher combustion velocity is better realized than in a conventional method. Next, the fundamental data were applied to an actual engine so as to obtain fundamental data on a radical engine operation by radical induced injection. A subchamber-type diesel engine was reconstructed to a SPI type engine controlled by the injection duration and spark timing and finally converted to a radical engine. In this study, operation characteristics of the radical engine were examined with the function of the subchamber's specification as the volume, orifice diameter and the number.
From these experimental results, the radical engine was successfully operated and was affected by the ratio of the orifice area to the subchamber volume.