• Title/Summary/Keyword: 라디칼 유도분사

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A Study on the Combustion Characteristics of Lean Mixture by Radicals Induced Injection in a Constant Volume Combustor (2) (정적연소기에서 라디칼 유도분사를 이용한 희박혼합기의 연소특성에 관한 연구 (2))

  • 박종상;강병무;이명준;하종률;정성식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.3
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    • pp.19-26
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    • 2004
  • A prior fundamental study was executed using a constant volume chamber to improve the burning properties of lean pre-mixture by the injection of active radicals generated in the sub-chamber. In consequence, RI method shows remarkable progress in the aspects of burning velocity and combustible lean limit compared with SI method. In this study, the necessary additional works have been performed to be based on the former results. We changed parameters as the initial temperature and the initial pressure of mixture. And the effects of residual gas at issue in a real engine were investigated. As a result, the effects of initial temperature were significant, but on the other hand, those of initial pressure were slight. The correlation of passage hole number between overall passage hole area was grasped. And the more detailed analysis is required on residual gas.

A Study on the Combustion Characteristics of Lean Mixture by Radicals Induced Injection in a Constant Volume Combustor (1) (정적연소기에서 라디칼 유도분사를 이용한 희박혼합기의 연소특성에 관한 연구 (1))

  • 박종상;이태원;하종률;정성식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.2
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    • pp.45-53
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    • 2004
  • An experimental study was carried out to obtain the fundamental data about the effects of radicals induced injection on premixture combustion. A constant volume combustor divided to the sub-chamber and the main chamber was used. The volume of the sub-chamber is set up to occupy less than 1.5% of that of whole combustion chamber. Radial twelve narrow passage holes are arranged between the main chamber and the sub-chamber. The products including radicals generated by spark ignition in the sub-chamber will derive the simultaneous multi-point ignition in the main chamber. While the equivalence ratio of pre-mixture in the main chamber and the sub-chamber is uniform. We have examined the effects of the sub-chamber volume, the diameter of passage hole, and the equivalence ratio on the combustion characteristics by means of burning pressure measurement and flame visualization. In the case of radical ignition method(RI), the overall turning time including the ignition delay became very short and the maximum burning pressure was slightly increased in comparison with those of the conventional spark ignition method(SI), that is, single chamber combustion without the sub-chamber. The combustible lean limit by RI method is extended to more ER=0.25 than that by SI method. Therefore the decrease of every emission including NOx and the improvement of fuel consumption is anticipated due to lean burn.