Using Reformer Gas to Enhance HCCI Combustion of CNG in a CFR Engine Mechanical Engineering Department, University of Alberta

Format:

Conference/Event

Author/Creator:

Hosseini, Vahid, author.

Conference Name:

Powertrain & Fluid Systems Conference and Exhibition (2006-10-16 : Toronto, Canada)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2006

Summary:

This paper describes use of reformer gas (RG) to alter and control combustion in a CNG-fueled HCCI engine. Experimental work used a mixture of simulated RG (75% H2 and 25% CO) to supplement base CNG fueling in a CFR engine upgraded to achieve high compression ratios. RG was used to improve the engine's operating performance and to control combustion onset in experiments conducted at three different compression ratios. A combination of high compression ratio (18.5) and high intake temperature (140°C) was observed to be appropriate to run the CNG-fueled CFR engine in HCCI mode. RG replacement of CNG altered combustion characteristics and expanded the operating range on the lean side. Use of RG decreased knock severity and reduced NOx emission. At constant relative air/fuel ratio (λ) it advanced combustion timing, moving the maximum cylinder pressure earlier in the cycle and increasing maximum pressure. Overall, the combustion efficiency increased slightly though there was also an increase in indicated specific CO, possibly because of the CO content in any unburnt fuel

Notes:

Vendor supplied data

Publisher Number:

2006-01-3247

Access Restriction:

Restricted for use by site license