年間 8 号発行
ISSN 印刷: 2150-3621
ISSN オンライン: 2150-363X
Indexed in
THE EFFECT OF FUEL PROPERTIES ON THE START OF INJECTION AND ENERGY RELEASE OF A COMPRESSION IGNITION ENGINE FUELED ON DIMETHYL ETHER
要約
The research reported here is concerned with the replacement of diesel oil with dimethyl ether (DME) as a fuel for an unmodified compression ignition engine. The different physical properties of these fuels were found to impact on the fuel injection process and on combustion. A standard, naturally aspirated four-stroke compression ignition engine was fueled on diesel oil and then on DME. All testing was performed at the injection timing and injector opening pressure as recom-mended for diesel fueling. Constant load tests at increasing engine speeds were performed on diesel and then on dimethyl ether. Analysis of the results shows that as a result of the lower bulk modulus of DME, the rate of pressure rise of DME in the fuel line and the maximum pressure prior to injection were lower than those attained with diesel fueling. It was also found that the start of injection with DME fueling occurred later than with diesel fueling, with the result that less energy was released before top dead center.