Gasoline-Diesel Dual Fuel: Effect of Injection Timing and Fuel Balance Eindhoven University of Technology

Format:

Other

Author/Creator:

Leermakers, Leermakers, author.

Contributor:

Albrecht, B.A.

de Goey, L.P.H.

Luijten, C.C.M.

Somers, L.M.T.

Van den Berge, B.

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

Recently, some studies have shown high efficiencies usingcontrolled auto-ignition by blending gasoline and diesel to adesired reactivity. This concept has been shown to give highefficiency and, because of the largely premixed charge, lowemission levels. The origin of this high efficiency, however, hasonly partly been explained. Part of it was attributed to a lowertemperature combustion, originating in lower heat losses. Anotherpart of the gain was attributed to a faster, more Otto-like (id estconstant volume) combustion.Since the concept was mainly demonstrated on one single testsetup so far, an experimental study has been performed to reproducethese results and gain more insight into their origin. Thereforeone cylinder of a heavy duty test engine has been equipped with anintake port gasoline injection system, primarily to investigate theeffects of the balance between the two fuels, and the timing of thediesel injection. Besides studying trends in the dual-fuel regime,this also allows to find best points to compare with conventionaldiesel combustion.Results show that compared to more conventional combustionregimes, this dual-fuel concept can escape from the commonNOx-smoke trade-off, reducing both to near-zero values.Although hydrocarbon emissions are somewhat increased, indicatedefficiencies are significantly improved. The absolute efficienciesare not as high as reported in other work, but the increase doesconfirm the potential of the concept. The increase in indicatedefficiency is shown to originate from a higher thermal efficiency,because short burn durations at high gasoline fractions enable forCA50 to be phased closer to TDC, without combustion occurring toomuch before TDC.Pressure rise rates are as low as with conventional dieselcombustion, when using the same Exhaust Gas Recirculation (EGR)percentage. Although the dual fuel concept has a much higher rateof heat release, this is phased better after TDC. A dedicated setof experiments has also shown that the late-cycle diesel injectionis dominant in combustion phasing and that control has to be foundin this diesel injections

Notes:

Vendor supplied data

Publisher Number:

2011-01-2437

Access Restriction:

Restricted for use by site license