Automotive Science and Engineering
Iran University of Science & Technology
Thu, Jun 26, 2025
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Volume 15, Issue 2 (6-2025)
ASE 2025, 15(2): 4704-4738 |
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Nazemian M, Nazemian M. A Holistic Approach to Reactivity-Controlled Compression Ignition Engine Performance: 4E Analysis (Evaporation, Energy, Emissions, Exergy) and Multidimensional Efficiency Metrics under Varying Engine Speed. ASE 2025; 15 (2) :4704-4738
URL: http://ijae.iust.ac.ir/article-1-700-en.html
URL: http://ijae.iust.ac.ir/article-1-700-en.html
Vahdat institute of Higher Education, Torbat-e Jam
Abstract: (67 Views)
This study investigates the performance of Reactivity-Controlled Compression Ignition (RCCI) engines under varying engine speeds using a 4E approach (Evaporation, Energy, Emissions, Exergy) and introduces innovative multidimensional efficiency indices. A 1.9-liter TDI Volkswagen engine was modeled in CONVERGE CFD software to analyze spray dynamics, combustion processes, and emissions across different engine speeds. New indices, including Evaporation-Energy Performance Index (EvEPI), Emission-Energy Synergy Index (EmESI), and Exergy-Emission Balance Index (ExEmBI), were developed to evaluate engine performance comprehensively. Results reveal that optimal performance occurs within 1600–2200 RPM, where fuel evaporation, combustion efficiency, and exergy utilization are maximized while emissions are minimized. For instance, at 3100 RPM, EvEPI increases sharply to 9857.17 mg/ms, reflecting enhanced evaporation but also highlighting risks of non-uniform fuel-air mixing at high speeds. Conversely, EmESI for HC rises from 33.04 gr/kW.h at 1000 RPM to 284.90 gr/kW.h at 3100 RPM, indicating increased unburned hydrocarbons due to incomplete combustion. NOx emissions decrease from 11.51 gr/kW.h at 1600 RPM to 2.28 gr/kW.h at 3100 RPM, aligning with reduced combustion temperatures. Higher speeds lead to elevated HC and CO emissions due to shorter mixing times, while lower speeds increase NOx due to prolonged combustion durations. Exergy analysis shows total and second-law efficiencies peak at lower speeds, emphasizing the importance of optimizing operational parameters. These findings provide valuable insights for designing efficient, low-emission RCCI engines.
Keywords: RCCI Engine, Engine Speed, Multidimensional Efficiency Indices, Exergy Analysis, Emissions
Type of Study: Research |
Subject:
Internal Combustion Engines (ICE, ...)
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