Browse > Article
http://dx.doi.org/10.5762/KAIS.2021.22.6.75

Numerical Study on the Effect of Diesel Injection Parameters on Combustion and Emission Characteristics in RCCI Engine  

Ham, Yun-Young (Department of Mechanical & Automotive Engineering, Woosuk University)
Min, Sunki (Division of Automotive Engineering, Ajou Motor College)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.6, 2021 , pp. 75-82 More about this Journal
Abstract
Low-temperature combustion (LTC) strategies, such as HCCI (Homogeneous Charge Compression Ignition), PCCI (Premixed Charge Compression Ignition), and RCCI (Reactivity Controlled Compression Ignition), have been developed to effectively reduce NOx and PM while increasing the thermal efficiency of diesel engines. Through numerical analysis, this study examined the effects of the injection timing and two-stage injection ratio of diesel fuel, a highly reactive fuel, on the performance and exhaust gas of RCCI engines using gasoline as the low reactive fuel and diesel as the highly reactive fuel. In the case of two-stage injection, combustion slows down if the first injection timing is too advanced. The combustion temperature decreases, resulting in lower combustion performance and an increase in HC and CO. The injection timing of approximately -60°ATDC is considered the optimal injection timing considering the combustion performance, exhaust gas, and maximum pressure rise rate. When the second injection timing was changed during the two-stage injection, considering the combustion performance, exhaust gas, and the maximum pressure increase rate, it was judged to be optimal around -30°ATDC. In the case of two-stage injection, the optimal result was obtained when the first injection amount was set to approximately 60%. Finally, a two-stage injection rather than a single injection was considered more effective on the combustion performance and exhaust gas.
Keywords
Injection Timing; Low Temperature Combustion; Reactivity Controlled Compression Ignition; Single Injection; Two-Stage Injection;
Citations & Related Records
연도 인용수 순위
  • Reference
1 A. Joshi, "Review of vehicle engine efficiency and emissions", SAE Technical Paper 2020-01-0352, 2020.
2 K. Epping, S. Aceves, R. Bechtold, J. Dec, "The potential of HCCI combustion for high efficiency and low emissions", SAE Technical Paper 2002-01-1923, 2002.
3 R. M. Hanson, S. L. Kokjohn, D. A. Splitter, R. D. Reitz, "An experimental investigation of fuel reactivity controlled PCCI combustion in a heavy-duty engine", SAE Technical Paper 2010-01-0864, 2010.
4 P. N. S. Ram, A. Krishnasamy, "Experimental investigations on the effects of multiple injections in reactivity-controlled compression ignition in a light-duty engine operated with gasoline/diesel", SAE Technical Paper 2020-01-5072, 2020.
5 E. Ansari, K. Poorghasemi, B. K. Irdmousa, M. Shahbakhti, J. Naber, "Efficiency and emissions of a light duty diesel-natual gas engine operating in conventional diesel and RCCI modes", SAE Technical Paper 2016-01-2309, 2016.
6 K. V. Puduppakkam, L. Liang, C. V. Naik, E. Meeks, S. L. Kokjohn, R. D. Reitz, "Use of detailed kinetics and advanced chemistry solution techniques in CFD to investigate dual-fuel ngine concepts", SAE Technical Paper 2011-01-0895, 2011.
7 M. Dahodwala, S. Joshi, E. Koehler, M. Franke, D. Tomazic, "Investigation of diesel-CNG RCCI combustion at multiple engine operating conditions", SAE Technical Paper 2020-01-0801, 2020.
8 S. K. Gupta, A. Krishnasamy, "Experimental investigations to extend the load range of premixed charge compression ignited light duty diesel engine through fuel modifications", SAE Technical Paper 2019-01-0953, 2019.
9 S. L. Kokjohn, R. M. Hanson, D. A. Splitter, R. D. Reitz, "Experiments and modeling of dual-fuel HCCI and PCCI combustion using in-cylinder fuel blending", SAE Technical Paper 2009-01-2647, 2009.
10 R. D. Reitz, G. Duraisamy, "Review of high efficiency and clean reactivity controlled compression ignition(RCCI) combustion in internal combustion engines", Progress in Energy and Combustion Science 46, pp.12-71, 2015.   DOI
11 M. R. Saxena, R. K. Maurya, "Effect of diesel injection timing on peak pressure rise rate and combustion stability in RCCI engine", SAE Technical Paper 2018-01-1731, 2018.