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Optimization of RCCI engine characteristics using RSM with CNG-Isobutanol under variable EGR and injection timings

Author

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  • Alli, Anil Kumar
  • Kotha, Madhu Murthy
  • Alur, Veeresh Babu

Abstract

This research introduces an innovative optimization framework for reactivity-controlled compression ignition (RCCI) engines utilizing compressed natural gas (CNG) and isobutanol, addressing the urgent need for sustainable alternatives to conventional diesel engines. By concentrating on three pivotal operating parameters—CNG injection timing, exhaust gas recirculation (EGR), and engine load—the research offers a comprehensive analysis of their interactive effects and combined impact on engine performance and emissions. The integration of response surface methodology (RSM) with design of experiments (DoE) distinguishes this study from previous research, providing a more holistic approach to understanding and optimizing RCCI engine operation. The experimental design and validation process employed in this study ensure statistical reliability and consistency, thereby enhancing the credibility of the findings. The findings indicate substantial enhancements in engine efficiency and emissions relative to standard diesel operation. Under optimized conditions, defined by an injection timing of 6.513 ms, 5 % exhaust gas recirculation (EGR), and an engine load of 9.494 kg, the RCCI engine achieved a brake thermal efficiency of 30.8 %, marking a 5.3 % improvement over conventional diesel operation. Brake-specific fuel consumption decreased by 29.4 %, while nitrogen oxides (NOx) emissions were reduced by 38 %. However, hydrocarbon (HC) and carbon monoxide (CO) emissions increased by 2.2 % and 2.6 %, respectively. These findings contribute to developing cleaner engine technologies and provide insights for future research in low-carbon engine technologies.

Suggested Citation

  • Alli, Anil Kumar & Kotha, Madhu Murthy & Alur, Veeresh Babu, 2025. "Optimization of RCCI engine characteristics using RSM with CNG-Isobutanol under variable EGR and injection timings," Energy, Elsevier, vol. 341(C).
    • Handle: RePEc:eee:energy:v:341:y:2025:i:c:s0360544225050480
    DOI: 10.1016/j.energy.2025.139406
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