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Energies 2018, 11(4), 738; https://doi.org/10.3390/en11040738

Performance and Combustion Characteristics Analysis of Multi-Cylinder CI Engine Using Essential Oil Blends

1
Biofuel Engine Research Facility, Queensland University of Technology (QUT), 2 George St, Brisbane City, QLD 4000, Australia
2
School of Engineering and Technology, Central Queensland University, Perth, WA 6000, Australia
3
Department of Marine Engineering, Vietnam Maritime University, 484 Lach Tray St, Hai Phong City 180000, Vietnam
4
Environmental Fluid Mechanics Group, Queensland University of Technology (QUT), 2 George St, Brisbane City, QLD 4000, Australia
5
International Laboratory for Air Quality and Health, Queensland University of Technology (QUT), 2 George St, Brisbane City, QLD 4000, Australia
6
Southern Cross Plant Science, Southern Cross University, P.O. Box 157, Lismore, NSW 2480, Australia
7
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523, USA
*
Author to whom correspondence should be addressed.
Received: 4 March 2018 / Revised: 20 March 2018 / Accepted: 22 March 2018 / Published: 24 March 2018
(This article belongs to the Collection Bioenergy and Biofuel)
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Abstract

Essential oils are derived from not-fatty parts of plants and are mostly used in aromatherapy, as well as cosmetics and perfume production. The essential oils market is growing rapidly due to their claimed health benefits. However, because only therapeutic grade oil is required in the medicinal sector, there is a substantial low-value waste stream of essential oils that can be used in the transportation and agricultural sectors. This study investigated the influence of orange, eucalyptus, and tea tree oil on engine performance and combustion characteristics of a multi-cylinder compression ignition engine. Orange, eucalyptus, and tea tree oil were blended with diesel at 10% by volume. For benchmarking, neat diesel and 10% waste cooking biodiesel-diesel blend were also tested. The selected fuels were used to conduct engine test runs with a constant engine speed (1500 RPM (revolutions per minute)) at four loads. As the load increased, frictional power losses decreased for all of the fuel samples and thus mechanical efficiency increased. At higher loads (75% and 100%), only orange oil-diesel blends produced comparable power to diesel and waste cooking biodiesel-diesel blends. Fuel consumption (brake and indicated) for the essential oil-diesel blends was higher when compared to base diesel and waste cooking biodiesel-diesel blends. Thermal efficiency for the essential oil-diesel blends was comparable to base diesel and waste cooking biodiesel-diesel blends. At higher loads, blow-by was lower for essential oil blends as compared to base diesel and waste cooking biodiesel-diesel blends. At 50% and 100% load, peak pressure was lower for all of the essential oil-diesel blends when compared to base diesel and waste cooking biodiesel-diesel blends. From the heat release rate curve, the essential oil-diesel blends ignition delay times were longer because the oils have lower cetane values. Overall, the low-value streams of these essential oils were found to be suitable for use in diesel engines at 10% blends by agricultural producers of these oils. View Full-Text
Keywords: essential oil; engine performance; combustion characteristics; compression ignition engine essential oil; engine performance; combustion characteristics; compression ignition engine
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rahman, S.M.A.; Nabi, M.N.; Van, T.C.; Suara, K.; Jafari, M.; Dowell, A.; Islam, M.A.; Marchese, A.J.; Tryner, J.; Hossain, M.F.; Rainey, T.J.; Ristovski, Z.D.; Brown, R.J. Performance and Combustion Characteristics Analysis of Multi-Cylinder CI Engine Using Essential Oil Blends. Energies 2018, 11, 738.

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