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Effect of compression ratio on engine knock, performance, combustion and emission characteristics of a bi-fuel CNG engine

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  • Sahoo, Sridhar
  • Srivastava, Dhananjay Kumar

Abstract

Compressed natural gas (CNG) is considered one of the most promising alternative fuel used in the transport sector. CNG has high octane number, wide flammability limit, and high H/C ratio, brings in important aspects regarding its feasibility as a fuel for internal combustion engines. It is necessary to have a dedicated engine rather than retrofitted, bi-fuels or dual-fuel ones to exploit the full potential of CNG properties. Most vehicles use the CNG in bi-fuel mode, where the fuel system is modified to operate either on gasoline or CNG. Therefore, the engine's compression ratio (CR) needs to be determined according to gasoline fuel requirement. However, CNG can be used at a higher CR, and the performance of the engine can be improved. The aim of this study is to investigate the effect of CR on knock intensity, performance, combustion, and emissions of a spark ignition (SI) engine fuelled with gasoline and CNG. Gasoline and CNG engine's performance were compared at different CRs and stoichiometric air-fuel ratio. The results show that the knock intensity was high at CR 12 and 7 bar indicated mean effective pressure (IMEP) for the gasoline-fueled engine. The maximum CR was limited to 12 for the gasoline engine. However, Knock was not observed even at CR 16 for the CNG engine. The engine was successfully operated at CR 16 with CNG. The performance and emission of the engine were also compared and presented. Fuel consumption and thermal efficiency were improved for CNG at higher CR compared to the gasoline engine.

Suggested Citation

  • Sahoo, Sridhar & Srivastava, Dhananjay Kumar, 2021. "Effect of compression ratio on engine knock, performance, combustion and emission characteristics of a bi-fuel CNG engine," Energy, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:energy:v:233:y:2021:i:c:s036054422101392x
    DOI: 10.1016/j.energy.2021.121144
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    References listed on IDEAS

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    2. Zareei, Javad & Ghadamkheir, Kourosh & Farkhondeh, Seyed Alireza & Abed, Azher M. & Catalan Opulencia, Maria Jade & Nuñez Alvarez, José Ricardo, 2022. "Numerical investigation of hydrogen enriched natural gas effects on different characteristics of a SI engine with modified injection mechanism from port to direct injection," Energy, Elsevier, vol. 255(C).
    3. Hosseini, M. & Chitsaz, I., 2023. "Knock probability determination employing convolutional neural network and IGTD algorithm," Energy, Elsevier, vol. 284(C).
    4. Sahoo, Sridhar & Srivastava, Dhananjay Kumar, 2023. "Numerical analysis of performance, combustion, and emission characteristics of PFI gasoline, PFI CNG, and DI CNG engine," Energy, Elsevier, vol. 278(C).
    5. Ireneusz Pielecha & Filip Szwajca, 2023. "Two- and Three-Stage Natural Gas Combustion System—Experimental Comparative Analysis," Energies, MDPI, vol. 16(9), pages 1-15, April.
    6. Pandey, Jayashish Kumar & Kumar, G.N., 2022. "Effects of hydrogen assisted combustion of EBNOL IN SI engines under variable compression ratio and ignition timing," Energy, Elsevier, vol. 246(C).
    7. Hammam Aljabri & Mickael Silva & Moez Ben Houidi & Xinlei Liu & Moaz Allehaibi & Fahad Almatrafi & Abdullah S. AlRamadan & Balaji Mohan & Emre Cenker & Hong G. Im, 2022. "Comparative Study of Spark-Ignited and Pre-Chamber Hydrogen-Fueled Engine: A Computational Approach," Energies, MDPI, vol. 15(23), pages 1-21, November.

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