報告題目：Blue Flame Combustion with Diesel Injection System
- Modulating Spray Liquid Length and Flame Lift Off -
報告人：Keiya NISHIDA 教授（廣島大學）
報告時間：2022年6月17日（周五） 15:30-17:00； 騰訊會議 909-919-399
報告摘要：Latest design of a Diesel engine combustion system adopts very high injection pressure (200MPa or higher) and very small nozzle hole diameter (0.1mm or smaller) to reduce the soot emission, since the exhaust gas recirculation (EGR) is mandatory to decrease NOx though EGR causes the soot formation. To clarify the reason why such an injection condition reduces the soot formation in the spray flame, the spray and flame experiments were conducted using the constant volume chamber with optical access, the high-speed video camera and the spray/combustion diagnostics. Measurement was made of Liquid Length (LL), the length of the liquid phase from the nozzle hole exit, of the evaporating spray and Lift-Off-Length (LOL), the length from the nozzle hole exit to the ignition location of the spray flame. Increasing the injection pressure and decreasing the nozzle hole diameter avoid the interference between LL and LOL, inhibit the soot formation, and create the blue flame.
報告人簡介：Dr. Keiya Nishida is a Professor (Special Appointment) in the Department of Mechanical Engineering, Graduate School of of Advanced Science and Engineering, University of Hiroshima, Japan. He received his B.S. in Mechanical Engineering in 1978, M.S. in Engineering of Transportation Phenomena in 1980, and Ph.D. in 1989, all from University of Hiroshima. From 1980 to 1982, he was a research and development engineer in the internal combustion engine department of Kubota Ltd, Osaka, Japan. He joined University of Hiroshima as a Research Associate in 1982, and has been involved in experimental and computational studies on the fuel spray and combustion in internal combustion engines. He became an Associate Professor in 1990 and a Professor in 2011. He spent one year from 1995 to 1996 at Department of Mechanical Engineering and Applied Mechanics, University of Michigan, USA, as a visiting scholar. He got the awards such as the prize for the best paper in the field Diesel engines presented at 20th CIMAC Congress in 1993, SAE Horning Memorial Award in 1994, JSME best paper award in 1995, Best Paper Award of 17th Small Engine Technology Conference in 2011, and Lloyd’s Register Manson Prize from Japan Institute of Marine Engineering in 2012, etc.