7.CONCLUSION
The results of experiments and calculations bring about the following conclusions.
(1) The ignition timing control by the multiple sparks from a single source and/or the multi-flame ignition from dual sources can successfully be applied to the practical use. The experimental results indicate a possibility to reduce NOx emission without appreciable sacrifice of fuel economy. The cycle simulation also supports the trend.
(2) A multi-zone model for the burnt gas predicts a considerable difference in the maximum temperature distribution in the burnt space. This evidence indicates that the multi-zone model should be taken into consideration for a precise estimation of NOx emission in the cycle.
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