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<p>To address the trade-off between NO<i>x</i> and soot emissions in methanol/diesel dual-fuel engines, this study employs a coupling approach of computational fluid dynamics (CFD) and chemical kinetics mechanisms. The effects of five key parameters: methanol substitution ratio (<i>MSR</i>), initial temperature (<i>IT</i>), initial pressure (<i>IP</i>), swirl ratio (<i>SR</i>), and diesel injection timing (<i>DIT</i>) on NO<i>x</i> and soot emissions are systematically analyzed. The results showed that appropriately increasing the <i>MSR</i> and delaying the <i>DIT</i> helps to reduce NO<i>x</i> emissions. Meanwhile, raising the <i>IT</i>, <i>IP</i>, and <i>SR</i> significantly suppresses soot formation and enhances its oxidation rate. Based on the sensitivity optimization design (SOD), it is observed that the <i>IT</i> exhibits the highest sensitivity to both NO<i>x</i> and soot emissions, with sensitivity values of 2.9353 and 2.2839 respectively, and a wide range of variation. When the <i>IT</i> is 390&#xa0;K and the <i>IP</i> is 0.26&#xa0;MPa, soot emissions reach their minimum value of 0.0264&#xa0;mg, while NO<i>x</i> emissions are 0.217&#xa0;mg. Compared to the original case, NO<i>x</i> emissions have been reduced by 13.9%, and soot emissions have decreased by 10.3%. The optimization scheme (Case 2) demonstrates significant potential in synergistically suppressing both NO<i>x</i> and soot, confirming that reasonable parameter optimization can effectively address the trade-off between NO<i>x</i> and soot. This provides both theoretical foundation and practical reference for the emission optimization design of methanol-diesel dual-fuel engines.</p>

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Study of emission characteristics of methanol/diesel dual-fuel engine based on sensitivity optimization design

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Guangyuan Bao,
  • Chao He,
  • Yapeng Liu,
  • Yu Dai,
  • Jiaqiang Li

摘要

To address the trade-off between NOx and soot emissions in methanol/diesel dual-fuel engines, this study employs a coupling approach of computational fluid dynamics (CFD) and chemical kinetics mechanisms. The effects of five key parameters: methanol substitution ratio (MSR), initial temperature (IT), initial pressure (IP), swirl ratio (SR), and diesel injection timing (DIT) on NOx and soot emissions are systematically analyzed. The results showed that appropriately increasing the MSR and delaying the DIT helps to reduce NOx emissions. Meanwhile, raising the IT, IP, and SR significantly suppresses soot formation and enhances its oxidation rate. Based on the sensitivity optimization design (SOD), it is observed that the IT exhibits the highest sensitivity to both NOx and soot emissions, with sensitivity values of 2.9353 and 2.2839 respectively, and a wide range of variation. When the IT is 390 K and the IP is 0.26 MPa, soot emissions reach their minimum value of 0.0264 mg, while NOx emissions are 0.217 mg. Compared to the original case, NOx emissions have been reduced by 13.9%, and soot emissions have decreased by 10.3%. The optimization scheme (Case 2) demonstrates significant potential in synergistically suppressing both NOx and soot, confirming that reasonable parameter optimization can effectively address the trade-off between NOx and soot. This provides both theoretical foundation and practical reference for the emission optimization design of methanol-diesel dual-fuel engines.