Straight vegetable oils (SVO) are a promising alternative to diesel oil (DO) for diesel engines, due to having comparable properties to mineral diesel, being easy to produce compared to counterparts and offering smaller emissions footprints. Therefore, the experimental study aims to evaluate the potential and influence of Jatropha oil (JO) as diesel engine fuel. Endurance long term operation tests of 300 hours for JO and 100 hours for DO were conducted on a small single cylinder 6.5 kW diesel engine generator to investigate the durability, performance and emission characteristics of the engine with the two different fuelling conditions. The experimental results demonstrate that engine performance and emissions characteristics are not stable
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The foreseeable future highlights various alternative sources of energy with potential to reduce emissions and supplant heavy fuel oil (HFO) in two-stroke diesel engines. The possible alternatives are liquefied natural gas (LNG), hydrogen, biogas and biofuels such as straight vegetable oil and biodiesel. Straight vegetable oils are promising and an appropriate alternative due to being safe with a higher flash point than diesel, offering a smaller carbon footprint and do not require significant modifications to the engine. Also, SVOs are cheaper than their counterparts such as biodiesels, which have to go through a transesterification step, thus energy input required increasing the cost of …show more content…
The brake thermal efficiency of engine running on SVOs is found to be lower, whereas the brake specific fuel consumption is higher compared to diesel [1-3]. With regard to exhaust gas emissions, some studies reported that SVOs increase the production of CO, CO2 and unburned HC emissions, while NOx is found to be reduced compared with diesel [2, 4]. The higher viscosity and low volatility of SVOs are reported to be the cause of inferior performance, thus preheating the oil before injection showed an increase in performance and emissions reduction. It has been observed that preheating increases the brake thermal efficiency and reduces the emissions compared to unheated SVOs, whereas preheating improves the atomisation and spray characteristics bringing the properties of SVOs closer to diesel [5,
The foreseeable future highlights various alternative sources of energy with potential to reduce emissions and supplant heavy fuel oil (HFO) in two-stroke diesel engines. The possible alternatives are liquefied natural gas (LNG), hydrogen, biogas and biofuels such as straight vegetable oil and biodiesel. Straight vegetable oils are promising and an appropriate alternative due to being safe with a higher flash point than diesel, offering a smaller carbon footprint and do not require significant modifications to the engine. Also, SVOs are cheaper than their counterparts such as biodiesels, which have to go through a transesterification step, thus energy input required increasing the cost of …show more content…
The brake thermal efficiency of engine running on SVOs is found to be lower, whereas the brake specific fuel consumption is higher compared to diesel [1-3]. With regard to exhaust gas emissions, some studies reported that SVOs increase the production of CO, CO2 and unburned HC emissions, while NOx is found to be reduced compared with diesel [2, 4]. The higher viscosity and low volatility of SVOs are reported to be the cause of inferior performance, thus preheating the oil before injection showed an increase in performance and emissions reduction. It has been observed that preheating increases the brake thermal efficiency and reduces the emissions compared to unheated SVOs, whereas preheating improves the atomisation and spray characteristics bringing the properties of SVOs closer to diesel [5,