Effect of speed and load on exergy recovery in a water-cooled two stroke gasoline-ethanol engine for bsfc reduction purposes

• Published in: Scientia Iranica. Transaction B, Mechanical Engineering Vol. 21; no. 1; p. 171
• Main Authors: Ghazikhani, M, Hatami, M, Safari, B
• Format: Journal Article
• Language: English
• Published: 2014
• Subjects: Combustion; Engines; Ethanol; Ethyl alcohol; Exergy; Fuels; Law; Reduction
• ISSN: 1026-3098

The most important part of the second law of thermodynamics is described as determining the value and source of wasted exergy in processes, and suggests concepts for reducing those losses in order to enhance efficiency. The main purpose of this paper is to study the effect of alcoholic additives, load and engine speed on combustion irreversibilities and second law efficiency. The mentioned alcoholic fuel is ethanol, which is combined with gasoline in different percentages of 5%, 10% and 15%. The experiments have been done for 2,500, 3,000, 3,500 and 4,500 rpm, and 25%, 50% and 75% full load. The results show that, mostly, when alcoholic fuel is used, the combustion internal irreversibility increases and second law efficiency decreases, which is due to the increase in temperature difference between burned combustion products and unburned mixtures, but, an increase in load and engine speeds increases second law efficiency. Another important outcome of the present study is in demonstrating brake specific fuel consumption reduction, due to using recovered exergy from water, whose average value is 14.1%.