INJECTION AND COMBUSTION OF RME WITH WATER EMULSIONS IN DIESEL ENGINE
This paper presents possibilities of using fully digitised triggerable video system AVL VideoScope 513D for analysis of injection and combustion inside diesel engine cylinder fuelled by RME with water emulsions. As a research objects were used: standard diesel fuel, rapeseed methyl ester (RME) and RME-water emulsions. With the aid of helical flow reactor stable emulsions with water fraction up to 30％ in weight were obtained, using an additive to prevent the water from separating out of the emulsion. The effect of emulsions on the exhaust gases emissions (NOx, CO and HC), particulate matters emission PM, smoke and fuel consumption of a one cylinder HD diesel engine with direct injection was investigated. Additionally the maximum rise of cylinder pressure was calculated from the indicator diagram. The test engine was operated at constant speed of 1600 rpm and 4 bar BMEP load conditions. A fuel injection and combustion processes were observed and analysed with endoscopes and digital camera. The temperature distribution in combustion chamber was analysed quantitatively with the two-colour method. The injection and combustion phenomena were described and compared. Possibility of reduction of NOX formation in the combustion chamber of diesel engine by addition of water in the combustion zone was presented. Evaporating water efficiently lowers peak flame temperature and temperature in post-flame zone. For diesel engines there is an exponential relationship between NOx emissions and peak combustion temperatures. The energy needed to vaporize the water results in lower peak temperatures of the combusted gases, with a consequent reduction in nitrogen oxide formation. Experimental results show up to 50％ NOX emission reduction with use of 30％ water in RME emulsion at unchanged engine performance.
diesel engine RME - water emulsions injection combustion visualization
CISEK Jerzy
Cracow University of Technology, Institute of Automobiles and Internal Combustion Engines,Division of Diesel Engines 31-864 Kraków, al. Jana Pawla Ⅱ 37, Poland
国际会议
北京
英文
1262-1278
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）