Combustion characteristics of hydrotreated vegetable oil – diesel blend under EGR and supercharged conditions

This paper investigates the effects of Hydrotreated vegetable oil-diesel blend to combustion characteristics under various ambient oxygen concentrations and ambient pressure. Combustion characteristics were investigated using heat release rate analysis, two color method, soot concentration measureme...

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Bibliographic Details
Published in:International journal of automotive technology 2017-08, Vol.18 (4), p.643-652
Main Authors: Ewphun, Pop-Paul, Vo, Chau Tan, Srichai, Prathan, Charoenphonphanich, Chinda, Sato, Susumu, Kosaka, Hidenori
Format: Article
Language:English
Subjects:
Automotive Engineering
Combustion
Delay
Diesel engines
Diesel fuels
Engineering
Flame temperature
Heat
Heat release rate
Ignition
Natural gas
Oxygen
Pressure
Soot
Vegetable oils
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Summary:This paper investigates the effects of Hydrotreated vegetable oil-diesel blend to combustion characteristics under various ambient oxygen concentrations and ambient pressure. Combustion characteristics were investigated using heat release rate analysis, two color method, soot concentration measurement and NOx concentration measurement. The experiments were carried out on a rapid compression expansion machine to simulate the ambient condition of a CI engine at TDC. Synthetic gas with oxygen concentrations of 21 %, 15 % and 10 % were used to simulate EGR conditions. A single hole injector was used with five different fuels: commercial diesel, HVO-commercial diesel blends and HVO. The results showed that increasing HVO blending percentages decreased ignition delay, flame temperature, soot concentration and NOx concentration. Heat release at oxygen concentration of 10 % dramatically dropped due to a shortened ignition delay, which resulted in less combustion. A decreased oxygen concentration from applied EGR conditions not only increased ignition delay, heat release, flame temperature and NO x concentration, but also increased soot concentration. A combination of EGR and supercharged conditions by increasing ambient pressure and decreasing oxygen concentrations resulted in increased heat release, decreased flame temperature, ignition delay and soot concentration, compared to EGR conditions.
ISSN:1229-9138
1976-3832
DOI:10.1007/s12239-017-0064-y