분사조건에 따른 가솔린 직접분사용 다공 분사기에서의 LPG 분무특성 = LPG Spray Characteristics in a Multi-hole Injector for Gasoline Direct Injection

다국어 초록 (Multilingual Abstract)

Liquefied petroleum gas (LPG) is regarded as an alternative fuel for spark ignition engine due to similar or even higheroctane number. In addition, LPG has better fuel characteristics including high vaporization characteristic and low carbon/hydrogen ratio leading to a reduction in carbon dioxide emission. Recently, development of LPG direct injection systemstarted to improve performance of vehicles fuelled with LPG. However, spray characteristics of LPG were not well understood,which is should be known to develop injector for LPG direct injection engines. In this study, effects of operation conditionincluding ambient pressure, temperature, and injection pressure on spray properties of n-butane were evaluated andcompared to gasoline in a multi-hole injector. As general characteristics of both fuels, spray penetration becomes smaller withan increase of ambient pressure as well as a reduction in the injection pressure. However, it is found that evaporation of nbutanewas faster compared to gasoline under all experimental condition. As a result, spray penetration of n-butane wasshorter than that of gasoline. This result was due to higher vapor pressure and lower boiling point of n-butane. On the otherhand, spray angle of both fuels do not vary much except under high ambient temperature conditions. Furthermore, sprayshape of n-butane spray becomes completely different from that of gasoline at high ambient temperature conditions due toflash boiling of n-butane.

참고문헌 (Reference)

1 Jinyoung Jung, "희박성층연소조건의 분무유도식 DISI 엔진에서 LPG연료의 연소 특성" 59-64, 2012

2 김성수, "정적챔버에서 GDI용 연료분사기의 가솔린, M85, E85 및 LPG 분무 계측" 한국동력기계공학회 16 (16): 5-10, 2012

3 Eran Sher, "Flash-boiling atomization" 34 (34): 417-439, 2008

4 Cha-Lee Myung, "Comparative study of engine control strategies for particulate emissions from direct injection light-duty vehicle fueled with gasoline and liquid phase liquefied petroleum gas (LPG)" 94 : 348-355, 2012

5 Wei Zeng, "Atomization and vaporization for flash-boiling multi-hole sprays with alcohol fuels" 95 : 287-297, 2012

6 Lefebvre, Arthur H., "Atomization and sprays" CRC press 1989

7 Kim, Y. H., "A study on the characteristics of spray in a LPG direct injection engine" KSAE