Knock and Emission Characteristics of Heavy-Duty HCNG Engine with Modified Compression Ratios University of Science and Technology

Format:

Conference/Event

Author/Creator:

Lim, Lim, author.

Contributor:

Choi, Young

Kim, Changgi

Lee, Sungwon

Park, Cheolwoong

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:

Reduction of carbon dioxide (CO₂) emission, which causes globalwarming, is an important guideline for vehicle engine development.There are two types of methods for reducing the CO₂ emission of avehicle engine. The first involves improving engine efficiency. Thesecond involves the use of a low-carbon fuel, id est, fuel with highhydrogen to carbon ratio. Hydrogen-compressed natural gas blend(HCNG) has been researched as a low-carbon fuel. Given that thermalefficiency of an engine cycle increases with its compression ratio(CR), an HCNG engine with high compression ratio not only has highefficiency but also low CO₂ emission. However, unexpectedcombustion such as knock could occur owing to the increased CR.In this study, we investigated the knock and emissioncharacteristics of an 11-L heavy-duty HCNG engine with a modifiedCR. A conventional CNG engine was fuelled with HCNG30 (CNG 70 vol%and hydrogen 30 vol%). The engine was operated at 1,260 rpm, underthe wide open throttle condition, and with CRs of 10.5 and 11.5.The results showed that under a CR of 11.5, the engine's knockmargin decreased because of higher in-cylinder pressure andtemperature. Thermal efficiency improved with the increased CR,which caused a significant decrease in CO₂ emission. However,NOx emission increased slightly at a certain excessair-ratio condition

Notes:

Vendor supplied data

Publisher Number:

2013-01-0845

Access Restriction:

Restricted for use by site license