Reactivity Controlled Compression Ignition (RCCI) in a Single-Cylinder Air-Cooled HSDI Diesel Engine UW-Madison

Format:

Conference/Event

Author/Creator:

Pohlkamp, Pohlkamp, author.

Contributor:

Reitz, Rolf D.

Conference Name:

2012 Small Engine Technology Conference & Exhibition (2012-10-16 : Madison, Wisconsin, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

An experimental investigation of Reactivity ControlledCompression Ignition (RCCI) combustion was conducted in a smallsingle-cylinder HSDI diesel generator engine and compared tostandard Direct Injection (DI) diesel combustion to assess thevalidity of this combustion strategy for high efficiency operationand simultaneous NOx and soot emission reduction in cylinder forthis type of engine. A Yanmar L70AE engine was modified from itsunit injector mechanical fuel system to operate with a moreflexible, electrically controlled common rail DI fuel system inorder to achieve the high level of injection event control requiredfor RCCI combustion.RCCI combustion was realized using split, early DI diesel fueland Port Fuel Injected (PFI) gasoline for 25%, 50% and 75% engineloads (~3, 4.3 and 5.5 bar IMEPn). The effects of intake airtemperature, DI injection timing and combustion phasing on engineefficiency, emissions and combustion stability were explored.The results indicated that RCCI combustion was effective atreducing NOx and soot emissions, but suffered from increased HC andCO emissions, and poor combustion efficiency at light loads, andhigher levels of combustion variation compared to conventionaldiesel combustion. Thermal efficiency of RCCI combustion sufferedat low loads due to poor combustion efficiency. At 75% load, RCCIattained nearly a 3% efficiency improvement over standard dieselcombustion, indicating that there is significant opportunity toreduce light load fuel consumption with further optimization effortfocused on combustion efficiency

Notes:

Vendor supplied data

Publisher Number:

2012-32-0074

Access Restriction:

Restricted for use by site license