RCCI Engine Operation Towards 60% Thermal Efficiency Univ of Wisconsin

Format:

Conference/Event

Author/Creator:

Splitter, Splitter, author.

Contributor:

DelVescovo, Dan

Reitz, Rolf D.

Wissink, Martin

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

The present experimental study explored methods to obtain themaximum practical cycle efficiency with Reactivity ControlledCompression Ignition (RCCI). The study used both zero-dimensionalcomputational cycle simulations and engine experiments. Theexperiments were conducted using a single-cylinder heavy-dutyresearch diesel engine adapted for dual fuel operation, with andwithout piston oil gallery cooling. In previous studies, RCCIcombustion with in-cylinder fuel blending using port-fuel-injectionof a low reactivity fuel and optimized direct-injections of higherreactivity fuels was demonstrated to permit near-zero levels of NOxand PM emissions in-cylinder, while simultaneously realizing grossindicated thermal efficiencies in excess of 56%.The present study considered RCCI operation at a fixed loadcondition of 6.5 bar IMEP an engine speed of 1,300 [r/min]. Theexperiments used a piston with a flat profile with 18.7:1compression ratio. The results demonstrated that the indicatedgross thermal efficiency could be increased by not cooling thepiston, by using high dilution, and by optimizing in-cylinder fuelstratification with two fuels of large reactivity differences. Thebest results achieved gross indicated thermal efficiencies near60%. By further analyzing the results with zero-dimensional enginecycle simulations, the limits of cycle efficiency wereinvestigated. The simulations demonstrated that the RCCI operationwithout piston oil cooling rejected less heat, and that ~94% of themaximum cycle efficiency could be achieved while simultaneouslyobtaining ultra-low NOx and PM emissions

Notes:

Vendor supplied data

Publisher Number:

2013-01-0279

Access Restriction:

Restricted for use by site license