This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Achievement of Diesel Low Temperature Combustion through Higher Boost and EGR Control Coupled with Miller Cycle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
Annotation ability available
Diesel engines generally tend to produce a very low level of NOx and soot through the application of Miller Cycle, which is mainly due to the low temperature combustion (LTC) atmosphere resulting from the Miller Cycle utilization. A CFD model was established and calibrated against the experimental data for a part load operation at 3000 r/min. A designed set of Miller-LTC combustion modes were analyzed. It is found that a higher boost pressure coupled with EGR can further tap the potential of Miller-LTC cycle, improving and expanding the Miller-LTC operation condition. The simulated results indicated that the variation of Miller timings can decrease the regions of high temperatures and then improve the levels and trade-off relationship of NOx and soot. The in-cylinder peak pressure and NOx emissions were increased dramatically though the problem of insufficient intake charge was resolved by the enhanced intake pressure that is equivalent to dual-stage turbo-charging. In addition, the positive effect of EGR can overwhelm the side effect of a high intake pressure on the in-cylinder peak pressures and NOx emissions, mitigating the mechanical load of diesel engines and improving the emission levels. Therefore the operation range of Miller-LTC cycle diesel engines was expanded to high load conditions, and the adaptability to variable operating conditions was enhanced through the optimization of Miller timings, high intake pressures and EGR ratios. However, the amount of BSFC in these cases couldn't be involved in this paper.
CitationZhao, C., Yu, G., Yang, J., Bai, M. et al., "Achievement of Diesel Low Temperature Combustion through Higher Boost and EGR Control Coupled with Miller Cycle," SAE Technical Paper 2015-01-0383, 2015, https://doi.org/10.4271/2015-01-0383.
- Wang Yaodong, Lin Lin, Roskilly A P, Zeng Shengchuo, et al., “An analytic study of applying Miller cycle to reduce NOx emission from petrol engine,” Applied Thermal Engineering, 2007, doi:10.1016/j.applthermaleng.2007.01.013
- Wang Yaodong, Lin Lin, Zeng Shengchuo, Huang Jincheng, et al., “Application of the Miller cycle to reduce NOx emissions from petrol engines,” Applied Energy, 2008, doi:10.1016/j.apenergy.2007.10.009.
- Rinaldini, C. A., Mattarelli, E., Golovitchev, V., I., “Potential of the Miller cycle on a HSDI diesel automotive engine,” Applied Energy, 2013, 10.1016/j.apenergy.2013.05.056.
- Mattarelli, E., Rinaldini, C., Mazza, A., and Oliva, M., “Development of a 2-Stage Supercharging System for a HSDI Diesel Engine,” SAE Technical Paper 2009-01-2757, 2009, doi:10.4271/2009-01-2757.
- Millo, F., Mallamo, F., and Mego, G., “The Potential of Dual Stage Turbocharging and Miller Cycle for HD Diesel Engines,” SAE Technical Paper 2005-01-0221, 2005, doi:10.4271/2005-01-0221.
- Kang, J., Lee, J., Song, H., and Lee, D., “Enhancing Power Density with Two-Stage Turbochargers,” SAE Technical Paper 2012-01-0709, 2012, doi:10.4271/2012-01-0709.
- Aghav, Y., Kumar, M., Latey, A., Gandhi, N. et al., “Development of Two Stage Turbo-Charging for Medium Duty Diesel Engine of Power Generation Application,” SAE Technical Paper 2012-28-0007, 2012, doi:10.4271/2012-28-0007.
- Jayashankara, B. and Ganesan, V., “Effect of fuel injection timing and intake pressure on the performance of a DI diesel engine - A parametric study using CFD,” Energy Conversion and Management 2010, doi:10.1016/j.enconman.2009.11.006.
- Hountalas, D., T., Mavropoulos, G., C., and Binder, K., B., “Effect of exhaust gas recirculation (EGR) temperature for various EGR rates on heavy duty DI diesel engine performance and emissions,” Energy, 2008, doi:10.1016/j.energy.2007.07.002.
- zhao Changpu, Li Xiaozhan, Zhang Jun, Yang Junwei, et al., “Influences of Thermal and Dilution Effects of EGR on Combustion and Emissions of Diesel Engine,” Journal of Combustion Science and Technology, 2014, doi:10.11715/rskxjs.R201306004.
- Yuan Wenhua, He Shuang, Tian Jiangping, Yi Ping, et al., “Numerical simulation on NOx emission characteristics of high-power medium-speed diesel engine with Miller cycle,” Journal of central south university (Natural Science Edition), 2014, 45(1):84-90.