Browse > Article
http://dx.doi.org/10.7842/kigas.2013.17.1.7

A Study on the Knocking Characteristics with Various Excess Air Ratio in a HCNG Engine  

Lim, Gihun (Dept. of Environment & Energy Mechanical Engineering, University of Science and Technology)
Park, Cheolwoong (Korea Institute of Machinery and Materials)
Lee, Sungwon (Korea Institute of Machinery and Materials)
Choi, Young (Korea Institute of Machinery and Materials)
Kim, Changgi (Korea Institute of Machinery and Materials)
Lee, Janghee (Korea Institute of Machinery and Materials)
Publication Information
Journal of the Korean Institute of Gas / v.17, no.1, 2013 , pp. 7-12 More about this Journal
Abstract
As emission regulation for vehicle has been reinforced, many researches carried out for HCNG(hydrogen-natural gas blends) fuel to the conventional compressed natural gas (CNG) engine. However, abnormal combustion such as backfire, pre-ignition or knocking can be caused due to high combustion speed of hydrogen and it can result in over heating of engine or reduction of thermal efficiency and power output. In the present study, improvement of combustion performance was observed with HCNG fuel since it can extend a flammability limit. Knocking characteristics for CNG and HCNG fuel were investigated. Feasibility of HCNG fuel was evaluated by checking the knock margin according to excess air ratio. The operation of engine with HCNG was stable at minimum advance for best torque(MBT) spark timing and knock phenomena were not detected. However, it is necessary to prepare higher knock tendency since possibility of knock is higher with HCNG fuel.
Keywords
CNG; HCNG; Knocking; Thermal efficiency; Excess air ratio; Lean combustion;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Heywood, J. B., Internal Combustion Engine Fundamentals, 2nd ed., McGRAW-HILL, The United States, (1988)
2 Konig, G. and Sheppard, C., "End Gas Autoignition and Knock in a Spark Ignition Engine", SAE Technical Paper 902135, (1990)
3 Nates, R. and Yates, A., "Knock Damage Mechanisms in Spark-Ignition Engines", SAE Technical Paper 942064, (1994)
4 König, G., Maly, R., Bradley, D., Lau, A. et al., "Role of Exothermic Centres on Knock Initiation and Knock Damage", SAE Technical Paper 902136, (1990)
5 Fitton, J. and Nates, R., "Knock Erosion in Spark- Ignition Engines," SAE Technical Paper 962102, (1996)
6 Valtadoros, T. H., Wong, V.W., and Heywood, J. B., "Engine Knock Characteristics at the Audible Level", SAE Technical Paper 910567, (1991)
7 Fanhua, M., Haiquan, L., Yu, W., Yong, L., Junjun, W., and Shuli, Z., "Combustion and emission characteristics of a port-injection HCNG engine under various ignition timings", Int. Journal of Hydrogen Energy, Vol. 33, pp. 816-822, (2008)   DOI   ScienceOn
8 Fanhua, M., Mingyue W., Long, J., Renzhe, Chen., Jiao, Deng., and Nashay, N., "Performance and emission characteristics of a turbocharged CNG engine fueled by hydrogen-enriched compressed natural gas with high hydrogen ratio", Int. Journal of Hydrogen Energy, Vol. 35, pp. 6438-6447, (2010)   DOI   ScienceOn
9 Nafiz, K., Bilge, C., S., O. A., and Kadir, A., "Investigation of combustion characteristics and emissions in a spark-ignition engine fuelled with natural gas-hydrogen blends", Int. Journal of Hydrogen Energy, Vol. 34, pp.1026- 1034, (2009)   DOI   ScienceOn