Experimental investigation of tetrahydrofuran combustion in homogeneous charge compression ignition (HCCI) engine: Effects of excess air coefficient,engine speed and inlet air temperature |
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| Affiliation: | 1. School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran 16844, Iran;1. Department of Mechanical Engineering, Faculty of Engineering, Tarsus University, Tarsus, Mersin, Turkey;2. Department of Mechanical & Aerospace Engineering, School of Engineering and Applied Science, Princeton University, Princeton, NJ, USA;3. Department of Mechanical Engineering, Krishna Institute of Engineering & Technology, Ghaziabad, Uttar Pradesh, India;1. Automotive Engineering Research Group, Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia;2. Automotive Engineering Centre, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia;1. Ondokuz May?s University, Ye?ilyurt Demir Çelik Vocational High School, Department of Automotive Technology, Samsun, Turkey;2. Sakarya University of Applied Science, Faculty of Technology, Department of Mechanical Engineering, Sakarya, Turkey;3. Gazi University, Technical Education Vocational High School, Department of Machine and Material Technology, Ankara, Turkey;4. Bandirma Onyedi Eylul University, Maritime Vocational High School, Department of Ship Construction, Bal?kesir, Turkey;1. Gazi University, Technical Sciences Vocational High School, Ankara, Turkey;2. Burdur Mehmet Akif Ersoy University, Technical Sciences Vocational High School, Burdur, Turkey;3. Gazi University, Faculty of Technology, Department of Automotive Engineering, Ankara, Turkey |
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| Abstract: | In this study, the effects of tetrahydrofuran (THF) which is nontoxic and generated from renewable environmentally friendly lignocelluloses, and n-heptane/THF blends on combustion, performance and emission characteristics were investigated at various lambda, engine speed and inlet air temperatures. Wide ranges of lambda value and engine speed were investigated and the results were presented in comparison to n-heptane as reference fuel. The combustion parameters such as cylinder pressure, heat release rate, in-cylinder gas temperature, CA10, CA50, thermal efficiency, ringing intensity, maximum pressure rise rate and imep, the performance parameters such as brake torque, power output, specific fuel consumption and HC and CO emissions were determined. Operating range of the HCCI engine was also determined. The results showed that, increasing the lambda value decreased both the in-cylinder pressure and the heat release rate for all test fuels. The addition of tetrahydrofuran led to retard combustion phasing. Thermal efficiency increased about 54% for F60N40 compared to n-heptane at 60 °C inlet air temperature, 1200 rpm engine speed and λ = 2.2. The results also showed that HC and CO emissions increased with the increase of tetrahydrofuran. Furthermore, tetrahydrofuran caused to expand HCCI operating range towards to knocking and misfiring boundaries. |
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| Keywords: | Tetrahydrofuran HCCI Combustion Performance Emission |
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