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This experimental study was executed to obtain basic data for actual engine operation using radical induced ignition method (RI) which can achieve emission reduction and high efficiency due to the rapid bulk combustion. In this study, a direct injection diesel engine was converted into SI type engine with a sparkplug. The modified SI type engine can be divided into two classes. One is the SI engine with a sparkplug only at the cylinder head, and the other is the SI engine with the sparkplug which is enveloped in a sub-chamber. Also, a basic experimental was conducted in order to investigate combustion mechanism of radical induced injection before the experiment execution for actual engine using the modified SI engine. The bulk combustion phenomenon of radical induced ignition method was analyzed from the basic experiment by using a constant volume chamber. Volume value of sub-chamber used in this experiment is approximately 0.2% of one of the main combustion chamber. In this paper, combustion characteristics using radical induced injection method was compared with that of using spark ignition method according to change in the engine speed and equivalence ratio. As a result, in the case of the radical induced injection engine, the combustion duration and cycle variation were respectively reduced ranged from Φ (equivalence ratio)=0.8 (lean mixture ratio) to Φ =1.0 (stoichiometric ratio).

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ABSTRACT

1. INTRODUCTION

2. EXPERIMENTAL APPARATUS AND PROCEDURE

3. RESULTS AND DISCUSSION

4. CONCLUSIONS

ACKNOWLEDGEMENT

REFERENCES

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UCI(KEPA) : I410-ECN-0101-2009-556-015192443