Using Engine Experiments to Isolate Fuel Equivalence Ratio Effects on Heat Release in HCCI Combustion Saudi Aramco

Format:

Conference/Event

Author/Creator:

Babiker, Babiker, author.

Contributor:

Amer, Amer

Ghauri, Ahmar

Mathieu, Oliver

Viollet, Yoann

Conference Name:

SAE 2010 Powertrains Fuels & Lubricants Meeting (2010-10-25 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Detailed combustion studies have historically been conducted insimplified reacting systems, such as shock-tubes and rapidcompression machines. The reciprocating internal combustion enginepresents many challenges when used to isolate the effects of fuelchemistry from thermodynamics. On the other hand, the conditions insuch engines are the most representative in terms of pressure andtemperature histories. This paper describes the use of asingle-cylinder research engine as an advanced reactor to betterdetermine fuel effects experimentally. In particular, asingle-cylinder engine was operated in a manner that allowed theeffects of changes in charge composition and temperatures to beisolated from changes in equivalence ratio. An example study ispresented where the relative effects of low-temperature andhigh-temperature chemistry, and their effects on combustionphasing, are isolated and examined. A single-zone homogeneous modelbased on Chemkin code with detailed chemistry was interrogatedto better understand some of the trends identified.The engine was operated in HCCI mode under both steady-stateconditions and in an alternate-fired mode. The technique allows theeffect of fuel/air equivalence ratio to be isolated from otherparameters such as trapped residual content and wall temperatures.The Chemkin model was run with a 5-component mechanism from theReaction Design Model Fuels Consortium and was calibrated usingdata from the steady-state engine tests. Results showed goodcorrelation with combustion start and phasing for both the low- andhigh-temperature zones. The model was then used to explain therelationship between energy released and equivalence ratio in boththe low- and high-temperature regimes

Notes:

Vendor supplied data

Publisher Number:

2010-01-2189

Access Restriction:

Restricted for use by site license