Browse Publications Technical Papers 2012-32-0074
2012-10-23

Reactivity Controlled Compression Ignition (RCCI) in a Single-Cylinder Air-Cooled HSDI Diesel Engine 2012-32-0074

An experimental investigation of Reactivity Controlled Compression Ignition (RCCI) combustion was conducted in a small single-cylinder HSDI diesel generator engine and compared to standard Direct Injection (DI) diesel combustion to assess the validity of this combustion strategy for high efficiency operation and simultaneous NOx and soot emission reduction in cylinder for this type of engine. A Yanmar L70AE engine was modified from its unit injector mechanical fuel system to operate with a more flexible, electrically controlled common rail DI fuel system in order to achieve the high level of injection event control required for RCCI combustion.
RCCI combustion was realized using split, early DI diesel fuel and Port Fuel Injected (PFI) gasoline for 25%, 50% and 75% engine loads (~3, 4.3 and 5.5 bar IMEPn). The effects of intake air temperature, DI injection timing and combustion phasing on engine efficiency, emissions and combustion stability were explored.
The results indicated that RCCI combustion was effective at reducing NOx and soot emissions, but suffered from increased HC and CO emissions, and poor combustion efficiency at light loads, and higher levels of combustion variation compared to conventional diesel combustion. Thermal efficiency of RCCI combustion suffered at low loads due to poor combustion efficiency. At 75% load, RCCI attained nearly a 3% efficiency improvement over standard diesel combustion, indicating that there is significant opportunity to reduce light load fuel consumption with further optimization effort focused on combustion efficiency.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Ozone-Assisted Combustion: Experimental Assessment of the Influence of Ozone in a Single-Cylinder Diesel Engine

2015-01-0787

View Details

TECHNICAL PAPER

Effects of EGR and Intake Pressure on PPC of Conventional Diesel, Gasoline and Ethanol in a Heavy Duty Diesel Engine

2013-01-2702

View Details

TECHNICAL PAPER

Homogeneous Charge Combustion and Emissions of Ethanol Ignited by Pilot Diesel on Diesel Engines

2004-01-0094

View Details

X