Abstract
Abstract This paper presents effect of nozzle hole number on atomization characteristic of DME fuel spray using three different typeof injector having the hole number of 6, 7 and 8. For this study, PDPA(phase Doppler particle analyzer) experiment was per-formed in terms of T ASOE under various injection pressure. To compare general trend of atomization characteristic, the lawdata were ensemble averaged based on T eng of 0.2 ms. Results showed that the droplet diameter in terms of SMD(SauterMean Diameter) was reduced as increase in injection pressure. Increasing the number of hole lead to reduce in droplet diam-eter, but no significant reduction in diameter was observed between hole number of 7 and that of 8. In addition, increasingthe number of hole resulted in decrease in droplet velocity which is considered as the effect of reduction in spray momentumdue to decreasing of fuel quantity per each hole. 기호설명 SMD : 사우트 평균 입경P inj : 연료 분사 압력P amb : 분위기 압력T eng : 통전시간T ASOE : 분사 후 통전 시간 1. 서론
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