Abstract
In the present study investigates the effect of bio-ethanol on the performance and emissions of a biodiesel blend fueled compression ignition engine. The experiments are conducted using pongamia biodiesel blend B20 (20% pongamia biodiesel +80% diesel) with 5, 7.5 and 10% (v/v) of bio-ethanol on a four stroke single cylinder diesel engine. The tests are conducted at different load conditions. Performance and emissions characteristics are investigated for different bio-ethanol compositions. The results show that the brake thermal efficiency is maximum for B20E7.5 blend with a minimum brake specific fuel consumption. Carbon monoxide emission is minimum for B20E7.5 blend and NOx emission decreases as the bio-ethanol percentage is increased from 5 to 7.5%. The study reveals that 7.5% bio-ethanol with B20 pongamia biodiesel blend results better performance and emission characteristics.
Highlights
Diesel engines produce higher torque at low speeds, which is the key requirement of internal combustion engines
Fuel modification method is the tuning of the fuel properties to achieve complete combustion [7]
Researchers reported that the B20 blend of biodiesel of various vegetable oils contribute acceptable performance and emission levels results without any engine modifications [11, 12]
Summary
Diesel engines produce higher torque at low speeds, which is the key requirement of internal combustion engines. Researchers reported that the B20 blend of biodiesel of various vegetable oils contribute acceptable performance and emission levels results without any engine modifications [11, 12]. Due to its higher latent heat of evaporation, lower residual gas temperature is achieved, resulting in lower NOx emission He et al [16] reported lower NOx when the ethanol was blended with diesel. Use of alcohol as an additive to the fuel blend drastically reduces CO, HC, smoke and NOx emission. This method is used in biodiesel fuel operated CI engines. Zhu et al [18] studied the effect of ethanol-biodiesel fuel on the CI engine emissions They observed lower NOx and smoke emissions for alcohol blended biodiesel blends.
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