The Effect of LPG Composition on Combustion and Performance in a DME-LPG Dual-fuel HCCI Engine Korea Advanced Inst. of Science and Tech

Format:

Conference/Event

Author/Creator:

Oh, Oh, author.

Contributor:

Bae, Choongsik

Jang, Jinyoung

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The effect of the composition of propane (C₃H₈) and butane(C₄H₁₀) in liquefied petroleum gas (LPG) was investigated in adual-fuel HCCI engine fueled with di-methyl ether (DME) and LPG.The composition of LPG affects DME-LPG dual fuel HCCI combustiondue to the difference in the physical properties of propane thatand butane such as octane number, auto-ignition temperature andheat of vaporization.DME was injected directly into the cylinder at various injectiontiming from 160 to 350 crank angle degrees (CAD). LPG was injectedat the intake port with a fixed injection timing at 20 CAD.It was found that power output was increased with propane ratio.This gain in power output resulted from increased expansion workdue to the better anti-knock properties of propane. However, higherpropane ratio made combustion efficiency decrease because of thesuppression in low temperature reaction of DME which determinesheat release amount of high temperature reaction.Carbon monoxide (CO) emission was reduced and nitrogen oxide(NOx) emission increased as the propane ratio increased. This wasbecause increased in-cylinder pressure and temperature, caused bythe prolonged ignition delay, induced oxidation of CO and formationof NOx. However, due to the chain termination steps that occurredwith the addition of LPG, hydrocarbon (HC) emission was increasedas the propane ratio increased even though the in-cylindertemperature was increased as well.Given these findings pure propane may be the best fuelcomposition for a DME-LPG HCCI engine when considering engineperformance. However, it should be noted that the use of purepropane is accompanied by slight increases in HC and NOxemissions

Notes:

Vendor supplied data

Publisher Number:

2010-01-0336

Access Restriction:

Restricted for use by site license