Controlling the Heat Release in HCCI Combustion of DME with Methanol and EGR Technical Univ. of Denmark

Format:

Conference/Event

Author/Creator:

Pedersen, Pedersen, author.

Contributor:

Satō, Yoshio

Schramm, Jesper

Yanai, Tadanori

Conference Name:

International Powertrains, Fuels & Lubricants Meeting (2010-05-05 : Rio De Janeiro, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The effects of methanol and EGR on HCCI combustion of dimethyl ether have been tested separately in a diesel engine. The engine was equipped with a common rail injection system which allowed for random injection of DME. The engine could therefore be operated either as a normal DI CI engine or, by advancing the injection timing 360 CAD, as an HCCI engine. The compression ratio of the engine was reduced to 14.5 by enlarging the piston bowls.The engine was operated in HCCI mode with DME at an equivalence ratio of 0.25. To retard the combustion timing, methanol was port fuel injected and the optimum quantity required was determined. The added methanol increased the BMEP by increasing the total heat release and retarding the combustion to after TDC. Engine knock was reduced with increasing quantities of methanol. The highest BMEP was achieved when the equivalence ratio of methanol was around 0.12 at 1000 RPM, and around 0.76 at 1800 RPM.EGR was also used to retarding the timing. With a moderate amount of EGR the effect on the combustion was not notable, but as the equivalence ratio approached unity the combustion was increasingly delayed and the rate of reaction reduced. Engine knock seized entirely as the EGR ratio was increased above 60 %. The BMEP gain was however moderate, since lower cylinder pressures at higher EGR quantities counteracted the positive effects of combustion timing

Notes:

Vendor supplied data

Publisher Number:

2010-01-1489

Access Restriction:

Restricted for use by site license