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ORIGINAL RESEARCH article

Front. Energy Res.
Sec. Advanced Clean Fuel Technologies
Volume 12 - 2024 | doi: 10.3389/fenrg.2024.1503787

Investigation of the interaction of the MILD regime with HiTAC and no-combustion regimes in combustion region diagrams

Provisionally accepted
Muddada Srinivasarao Muddada Srinivasarao 1Giancarlo Sorrentino Giancarlo Sorrentino 2*Vanteru Mahendra Reddy Vanteru Mahendra Reddy 1*
  • 1 Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India
  • 2 Istituto di Scienze e Tecnologie per l'Energia e la Mobilità Sostenibili (STEMS) - CNR, Napoli, Italy

The final, formatted version of the article will be published soon.

    Moderate or intense low-oxygen dilution combustion is vital for reducing emissions. Recent advancements have introduced regime diagrams for various reactant mixtures, highlighting nocombustion, Moderate or intense low-oxygen dilution, and high-temperature air combustion regions to analyze the overall operating range. However, studies on these diagrams are limited and often lack detailed analysis. This study focuses on the interaction of the Moderate or intense low-oxygen dilution regime with other regimes, particularly examining ignition delay time. Initially, ignition delay times are analyzed using regime diagrams for methane, propane, and syngas fuel mixtures. Calculations reveal a consistent ignition delay time range at the boundary between Moderate or intense low-oxygen dilution and no-combustion, varying with fuel type. To investigate further, combustion regime diagrams for methane and methane-hydrogen mixtures are developed, considering dilution levels and preheating effects with N2, CO2, H2O, and exhaust gas recirculation. These diagrams examine the spread of the Moderate or intense low-oxygen dilution regime and the ignition delay times at the boundaries. The upper and lower limits of the moderate or intense low-oxygen dilution regime are noted based on obtained ignition delay times. An emission-based analysis within these regimes is conducted to assess the effectiveness of techniques in achieving moderate or intense low-oxygen dilution combustion. Proposed ignition delay time range for the considered mixtures aims to maintain mixture within the moderate or intense low-oxygen dilution regime, ensuring lower emissions. This is also further proved with the numerical simulations. The study also explores the sensitivity of dilution level, mixture temperature, N2, CO2, H2O, and EGR on the Moderate or intense low-oxygen dilution regime.

    Keywords: Combustion regime diagrams, MILD combustion, Ignition delay time, Emissions, CHEMKIN

    Received: 29 Sep 2024; Accepted: 31 Oct 2024.

    Copyright: © 2024 Srinivasarao, Sorrentino and Mahendra Reddy. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Giancarlo Sorrentino, Istituto di Scienze e Tecnologie per l'Energia e la Mobilità Sostenibili (STEMS) - CNR, Napoli, Italy
    Vanteru Mahendra Reddy, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India

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