Abstract
In this study, the application effects of canola oil biodiesel/diesel blends in a common rail diesel engine was experimentally investigated. The test fuels were denoted as ULSD (ultra low sulfur diesel), BD20 (20% canola oil blended with 80% ULSD by volume), and PCO (pure canola oil), respectively. These three fuels were tested under an engine speed of 1500 rpm with various brake mean effective pressures (BMEPs). The results indicated that PCO can be used well in the diesel engine without engine modification, and that BD20 can be used as a good alternative fuel to reduce the exhaust pollution. In addition, at low engine loads (0.13 MPa and 0.26 MPa), the combustion pressure of PCO is the smallest, compared with BD20 and ULSD, because the lower calorific value of PCO is lower than that of ULSD. However, at high engine loads (0.39 MPa and 0.52 MPa), the rate of heat release (ROHR) of BD20 is the highest because the canola oil biodiesel is an oxygenated fuel that promotes combustion, shortening the ignition delay period. For exhaust emissions, by using canola oil biodiesel, the particulate matter (PM) and carbon monoxide (CO) emissions were considerably reduced with increased BMEP. The nitrogen oxide (NOx) emissions increased only slightly due to the inherent presence of oxygen in biodiesel.
Highlights
Due to their high thermal efficiency, large power output, reliability, durability, and high fuel economy compared with gasoline engines, diesel engines are widely used in various sectors, such as industrial transportation, passenger cars, and agricultural applications, despite their disadvantages of noise and vibration
A constant brake mean effective pressures (BMEPs) of 0.13 MPa, 0.26 MPa, 0.39 MPa, and 0.52 MPa was controlled from the engine dynamometer, and the pilot injection timing and main injection timing were fixed at top dead center (TDC) 0◦
Ignition delay period, combustionisdurations, variationgas in indicated general, the combustion characteristic analyzedcoefficient by usingofcylinder pressure,mean rate effective of heat pressure,ignition and brake specific fuel combustion consumption.durations, Figure 3 shows the effects of ultra low sulfur diesel (ULSD),inBD20, and pure canola oil (PCO)
Summary
Due to their high thermal efficiency, large power output, reliability, durability, and high fuel economy compared with gasoline engines, diesel engines are widely used in various sectors, such as industrial transportation, passenger cars, and agricultural applications, despite their disadvantages of noise and vibration. Biofuels are alternative fuels that can effectively reduce engine exhaust emissions, such as CO and PM emissions, due to the oxygen they contain, which can promote combustion in the combustion chamber. They have energy security, nontoxicity, local availability, and recyclability [18,19,20]. Reham et al [40] studied that with a method of injection in a common rail diesel engine fueled with ultra low sulfur diesel (ULSD) and biodiesel. We can provide a reference value of research on the development and application of canola biodiesel in a common rail diesel engine
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