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The present study utilized ethanol as a renewable oxygenated fuel, which was blended with gasoline at varying ratios of 10% (G90E10), 15% (G85E15), and 20% (G80E20) by volume. The experimental investigation was carried out on a single-cylinder spark-ignition (SI) engine with variable compression ratio (VCR) and air-cooling system. To evaluate the engine's performance and emissions characteristics, pure gasoline (G100) was used as the reference fuel. The compression ratios (CRs) of 6:1, 8:1, and 10:1, were examined in this investigation at a speed of 2800 rpm. At the CR of 10:1, the maximum brake thermal efficiency (BTE) of 19.53% and 17.88% was found for G80E20 and G100, respectively. The brake-specific energy consumptions (BSECs) were observed to decrease with an increasing quantity of ethanol in the mixture but slightly enhanced at higher compression ratios (CRs). At a CR of 10:1, the maximum reduction of 65.27% in carbon monoxide (CO) emissions was noted for G80E20 blends compared to G100. In contrast, it was observed that the oxides of nitrogen (NOx) and carbon dioxide (CO2) increased with an increase in the ethanol quantity in the mixture as well as the compression ratio (CR).

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Ethanol–Gasoline Blends and Compression Ratios: An Experimental Investigation in a Small VCR SI Engine

  • 会议论文

  • 发表日期：

    2025年

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  • Achinta Sarkar,
  • Siba Prasad Behera,
  • Shivji Kumar,
  • Vivek Kumar Dubey

摘要

The present study utilized ethanol as a renewable oxygenated fuel, which was blended with gasoline at varying ratios of 10% (G90E10), 15% (G85E15), and 20% (G80E20) by volume. The experimental investigation was carried out on a single-cylinder spark-ignition (SI) engine with variable compression ratio (VCR) and air-cooling system. To evaluate the engine's performance and emissions characteristics, pure gasoline (G100) was used as the reference fuel. The compression ratios (CRs) of 6:1, 8:1, and 10:1, were examined in this investigation at a speed of 2800 rpm. At the CR of 10:1, the maximum brake thermal efficiency (BTE) of 19.53% and 17.88% was found for G80E20 and G100, respectively. The brake-specific energy consumptions (BSECs) were observed to decrease with an increasing quantity of ethanol in the mixture but slightly enhanced at higher compression ratios (CRs). At a CR of 10:1, the maximum reduction of 65.27% in carbon monoxide (CO) emissions was noted for G80E20 blends compared to G100. In contrast, it was observed that the oxides of nitrogen (NOx) and carbon dioxide (CO2) increased with an increase in the ethanol quantity in the mixture as well as the compression ratio (CR).