1. 제 목 : Partially Premixed Combustion (PPC) – the next step after HCCI

2. 연 사 : Prof. Bengt Johansson (Lund University)

3. 일 시 : 2012년 10월 12일 (금) 오후 3:30-4:30

4. 장 소 : 301동 117호

5. 내 용 :
  A large fraction of the fuel burned in the world is used in internal combustion engines. The IC engine is used in almost 100% of all cars, busses, trucks and ships around the world. The problem with IC engines is that combustion generate unwanted emissions of harmful components like NOx, HC and particulates. Emission regulations have during the last 40 years pushed down the levels of all the local emissions to less than 1% of the unregulated levels, for some of the components even more. However, all fuels containing carbon will generate CO2 in the combustion process and thus contribute to the green house effect. Traditionally there has been a trade-off between the locally harmful components and CO2 but some fifteen years ago, IC engine combustion had a breakthrough with the usage of low temperature combustion, often called HCCI. For the first time it was possible to combine the high efficiency combustion from the diesel engine with ultra low emission of NOx and PM without catalytic after treatment. The presentation will start by showing some results with HCCI and discuss why HCCI should be applied and what the limitations of HCCI are.
  Since HCCI have some severe limitations in practical operation, variations of the low temperature concept is studied. One such is Partially Premixed Combustion, PPC. With PPC, the cylinder charge should not be fully homogeneous at the start of combustion but rather have a suitable stratification. This gives a spread in reactivity and hence a moderated burn rate. It will be shown that PPC can be generated with two injections in a more or less standard diesel engine geometry. With more fuel in the first, early, injection the charge is more homogeneous and the burn rate will be higher. With more fuel in the second injection, close to TDC, the combustion resembles a classical diffusion controlled process with a long slow post oxidation giving poor fuel efficiency. With the correct moderation between the two injections, an ideal burn rate profile can be generated, resulting in very high efficiency, up to 57%. In order to get the correct stratification at combustion start, the fuel reactivity and injection process must be matched. It will be shown that the best results are generated with a fuel having properties close to regular gasoline.   

6. 연사약력 :
  Bengt Johansson is Professor in Internal Combustion Engines at Lund University since 2001 and head of the combustion engine group since 2004. He is also director of the Centre of Competence Combustion Processes with a number of international industry partners since 2003. His group is among the leaders in low temperature combustion research.
  Bengt Johansson is 2011-2015 part time professor at TU Eindhoven, the Netherlands and was Springer Professor at University of California at Berkeley 2006-2007. 
  He has been main organizer for the HCCI sessions for the last 20 or more SAE conferences and also the two HCCI symposia in Lund 2005 and 2007. He is chairman of the Combustion and Fuels Committee at the Land and Sea group within SAE 2012-2014. He is since 2006 chair for the HCCI fuels collaborative task within the Combustion Agreement at International Energy Agency, IEA. Within this duty he organized the annual IEA task leaders meeting in Lund 2011.
  He received the Horning Memorial Award 2000 for best SAE paper 1999, the Arch T. Colwell Merit Award 2000 and Forest R. McFarland Award in 2005, all three from SAE. He was promoted to SAE fellow in 2005. He got the “Gunnar Engströms ABB-Stiftelse” award 1998 and “Volvo Håkan Frisinger” award 2011.
  He has by October 2012 more than 240 publications, with 3700 citations. He has given more than 40 invited talks and keynotes on high efficiency and low emission combustion concepts, mainly HCCI and PPC.
 
7. 문 의 : 기계항공공학부 민경덕 교수 (880-1661), 송한호 교수 (880-1651)