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The current study investigates Custard Apple Methyl Ester (CAME) B20 blend performance and emissions in an injection-based compression ignition (CI) engine at CR 15.5, 16.5, and 17.5. BTE, BSFC, EGT, CO, HC, NOx, and smoke opacity are investigated. CAME B20 has a BTE of 28.5% at full load and a typical CR of 16.5, which is 4.5% lower than diesel’s 31.4%. Lower compression ratios increase the CAME B20 BTE to 30.2% at CR 16.5 and 30.7% at CR 15.5. This is 3.6 and 5.6% better than the CR 17.5. As compression ratios and loads increase, CAME B20’s BSFC drops to 0.3 kg/kWh at CR 15.5 and 16.5, compared to 0.31 kg/kWh at CR 17.5 and 0.28 kg/kWh for diesel. The combustion study reveals that CAME B20 EGT peaks at 327 °C at CR 17.5, 345 °C at CR 16.5, and 360 °C at CR 15.5. Emission studies show that fully loaded CAME B20 CO emissions decrease with increasing CRs: 0.09% at CR 17.5, 0.08% at CR 16.5, and 0.07% at CR 15.5, all less than diesel’s 0.12%. Compared to diesel’s 48 ppm at CR 17.5, CAME B20 emits 36 ppm at CR 16.5 and 32 ppm at CR 15.5. Despite having reduced CO, HC, and smoke emissions, CAME B20 produces higher NOx than diesel. At full load, CAME B20 generates 976 ppm NOx at CR 17.5, 1015 at CR 16.5, and 1109 at CR 15.5, which exceeds diesel’s 900 ppm. As CR increases, smoke opacity drops from 46% at CR 17.5 to 37% at CR 16.5 and 31% at CR 15.5, compared to 52% for diesel at CR 17.5.

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Enhancing the Performance of Custard Apple Methyl Ester in Diesel Engines Through Compression Ratio Optimization

  • 会议论文

  • 发表日期：

    2026年

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  • K. Surendrababu,
  • Prakash Sekar,
  • T. Lohidharshan,
  • K. V. Vishnu Jith

摘要

The current study investigates Custard Apple Methyl Ester (CAME) B20 blend performance and emissions in an injection-based compression ignition (CI) engine at CR 15.5, 16.5, and 17.5. BTE, BSFC, EGT, CO, HC, NOx, and smoke opacity are investigated. CAME B20 has a BTE of 28.5% at full load and a typical CR of 16.5, which is 4.5% lower than diesel’s 31.4%. Lower compression ratios increase the CAME B20 BTE to 30.2% at CR 16.5 and 30.7% at CR 15.5. This is 3.6 and 5.6% better than the CR 17.5. As compression ratios and loads increase, CAME B20’s BSFC drops to 0.3 kg/kWh at CR 15.5 and 16.5, compared to 0.31 kg/kWh at CR 17.5 and 0.28 kg/kWh for diesel. The combustion study reveals that CAME B20 EGT peaks at 327 °C at CR 17.5, 345 °C at CR 16.5, and 360 °C at CR 15.5. Emission studies show that fully loaded CAME B20 CO emissions decrease with increasing CRs: 0.09% at CR 17.5, 0.08% at CR 16.5, and 0.07% at CR 15.5, all less than diesel’s 0.12%. Compared to diesel’s 48 ppm at CR 17.5, CAME B20 emits 36 ppm at CR 16.5 and 32 ppm at CR 15.5. Despite having reduced CO, HC, and smoke emissions, CAME B20 produces higher NOx than diesel. At full load, CAME B20 generates 976 ppm NOx at CR 17.5, 1015 at CR 16.5, and 1109 at CR 15.5, which exceeds diesel’s 900 ppm. As CR increases, smoke opacity drops from 46% at CR 17.5 to 37% at CR 16.5 and 31% at CR 15.5, compared to 52% for diesel at CR 17.5.