Effects of injection rate on combustion and emissions of a pilot ignited direct injection natural gas engine
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Effects of Injection rates on combustion process and emissions of engines operating with directly injected natural gas and pilot diesel were numerically investigated. Injection rates of natural gas and diesel were investigated separately utilizing five types of injection rates. An impact factor was defined to present the effects of the initial and terminal injection rates of diesel and natural gas on the combustion and emissions more intuitionally. Based on the simulation results, cylinder pressure and temperature were more sensitive to terminal injection rates of pilot diesel than initial injection rates, and lower terminal injection rates of pilot diesel can achieve lower NO and Soot emission level. However, there is a trade-off between NO and Soot emissions affected by different natural gas injection rates. The impact factors of pilot diesel injection rates on pressure show a double-peak trend. However, the impact factors of natural gas injection rates on pressure show a single-peak trend.
KeywordsInjection rate Natural gas engine Combustion Emission Simulation
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- Keskinen et al., Mixture formation in a direct injection gas engine: Numerical study on nozzle type, injection pressure and injection timing effects, Energy, 94 (2016) 542–556.Google Scholar
- McTaggart-Cowan et al., The influence of fuel composition on a heavy-duty, natural-gas direct-injection engine, Fuel, 89 (3) (2010) 752–759.Google Scholar
- Mctaggart-Cowan et al., Hydrogen-methane blend fuelling of a heavy-duty, direct-injection engine, ASME 2007 International Mechanical Engineering Congress and Exposition, Seattle, Washington, USA (2007) 521–530.Google Scholar
- S. K. Aggarwal and D. E. Longman, A computational study on the effects of pre-ignition processes on diesel engine combustion and emissions, ASME/JSME 2011 Thermal Engineering Joint Conference, Honolulu, Hawaii, USA (2011) 181–186.Google Scholar
- Bae et al., The influence of breakup time constant and cavitation modeling on numerical simulation of highpressure diesel sprays, Symposium (ILASS-Japan) on Atomization, 9 (2000) 29–34.Google Scholar
- T. R. White, Simultaneous diesel and natural gas injection for dual-fuelling compression-engines, University of New South Wales, Australia (2006).Google Scholar
- C. R. Larson, Injection study of a diesel engine fueled with pilot-ignited, directly-injected natural gas, University of British Columbia, Canada (2003).Google Scholar
- B. Jafari and D. Domiri Ganji, Numerical investigation in the effect of number of nozzle hole on performance and emission in dual fuel engine, International J. of Automotive Engineering, 3 (2) (2013) 412–423.Google Scholar