Influence of ethanol on the performance, combustion and emission characteristics of a stationary diesel engine run on di
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Ó Indian Academy of Sciences
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Influence of ethanol on the performance, combustion and emission characteristics of a stationary diesel engine run on diesel–Mesua ferrea linn oil blend MARYOM DABI and UJJWAL K SAHA* Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India e-mail: [email protected]; [email protected] MS received 21 December 2019; revised 8 October 2020; accepted 12 October 2020 Abstract. The addition of ethanol to a blend of vegetable oil (VO) and diesel, in general, has been found to improve the compression ignition diesel engine performance. In the present investigation, the influence of ethanol on Mesua ferrea Linn oil–diesel blend has been studied. Mesua ferrea Linn trees, abundant in the north eastern states of India, have the potential to supplement the fossil diesel. The blend studied is composed of 30% Mesua ferrea Linn oil and 70% diesel by volume (VO30). Ethanol is added 5 and 10% by volume to VO30 binary blend to form two ternary blend VO30E05 (5% ethanol and 95% VO30) and VO30E10 (10% ethanol and 90% VO30). Experiments have been carried out in a four-stroke, single cylinder, water cooled, stationary diesel engine at various engine loads. The addition of ethanol results in an increase of brake thermal efficiency up to 1.5% as compared to neat VO30. The brake specific fuel consumption of the engine increases on an average by 1.8 and 3% with the use of 5 and 10% ethanol, respectively. The use of ethanol results an increase of CO and HC emissions while a decrease of NOX emission. Keywords.
Mesua ferrea Linn oil; diesel engines; ethanol; performance; combustion; emission.
1. Introduction In the current energy scenario, there is an urgent need to redress the gap in demand and supply of fossil fuel along with the conservation of environment at the same time. In view of this, fuels derived from the renewable sources have now been emphasized either for replacing or supplementing the fossil fuel. The oil derived from the seeds of vegetables could serve as an alternative to supplement the huge demand of fossil diesel both in transport and power sectors. This vegetable oil (VO) is renewable, reliable, and can be derived from thousands of vegetation species such as cotton, deccan hemp, jatropha, karanja, poon, rice bran, sunflower and others. However, the direct use of VOs in diesel engines results in the reduction of brake thermal efficiency (BTE), increase in brake specific fuel consumption (BSFC), and increase in the emissions of CO, unburned hydrocarbon (HC) and smoke due to their high viscosity and density as compared to diesel [1–7]. The simplest way to overcome this problem is to blend VO with diesel. The blending not only improves the BTE, but also reduces the BSFC and the emissions of CO, HC and smoke [5, 8–11]. It has also been reported that the blending of VO by 10% to diesel gives lower metallic debris in the lubricating oil in comparison to *For correspondence
neat diesel [12]. Blendin
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