Experimental Study on an Si Engine Fuelled by LPG/Acetylene Mixtures
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ght © 2020 KSAE/ 11725 pISSN 12299138/ eISSN 19763832
EXPERIMENTAL STUDY ON AN SI ENGINE FUELLED BY LPG/ACETYLENE MIXTURES Gursel Cinar1), Abdelrahman Eldamanhory1), Selahaddin Orhan Akansu1)*, Huseyin Enes Fil1) and Mehmet Ilhan Ilhak2) Department of Mechanical Engineering, Erciyes University, Melikgazi, Kayseri 38039, Turkey General Directorate of Highways 6th Regional Directorate, Mechanical and Supply Chief Engineering, Osman Kavuncu Neighborhood, Firat Street, No. 2, Melikgazi, Kayseri 38060, Turkey 1)
2)
(Received 27 February 2019; Revised 8 October 2019; Accepted 18 December 2019) ABSTRACTIn the current time, sustainability and development of internal combustion engines is subjected to two kinds of threats which are fossil fuel depletion and environmental pollution. So, considerable efforts in the world have been exerted to develop and introduce alternative gaseous fuels to replace conventional fuel by partial or total replacement. In this study, the effect of adding acetylene to LPG-fuelled SI engine has been examined. This addition was with flow rates of 500, 750 and 1000 g/h for 25 % load and 1000 g/h for 50 % load, respectively. An experimental investigation has been carried out on 4 stroke, 4- cylinder, water-cooled spark ignition (SI) engine at constant speed (1500 rpm). Also, performance and emissions parameters have been tested at different excess air coefficients (λ = 0.8, 1, 1.2 and 1.7). As a result, it has been found optimum conditions which are the addition of 750 g/h acetylene for 25 % load (almost 41 % of the LPG-acetylene mixture at λ = 1.2) and 1000 g/h for 50 % load (almost 36 % of the LPG-acetylene mixture at λ = 1.5). In addition, hydrocarbon (HC) and carbon monoxide (CO) emissions decreased, while NO emissions increased when compared to that of baseline LPG operation. KEY WORDS : LPG, acetylene, SI engine
NOMENCLATURE
The transportation sector is at present highly dependent on fossil fuels. Oil that accounts for nearly 100 % of fuel use in the sector has been cheap and plentiful in the past. However, economic and environmental risks are associated with the sector’s reliance on petroleum resources. Furthermore, the supply of crude oil is expected to be exhausted in the course of this century. Also, an increase in carbon emissions, equivalent to the emissions of 170 million additional cars, was the result of robust global economic growth of 3.7 %, lower fossil-fuel prices and weaker energy efficiency efforts. These three factors contributed to pushing up the global energy demand. An option for reducing the petroleum dependence problem of the transportation sector is a change to alternative fuels (Shivaprasad et al., 2014). An alternative to the presently used fuels, which should be pollution free, energy efficient and compatible with today’s automobiles. The suggested alternative fuels are alcohol, biodiesel, and gaseous fuels like CNG, LPG, hydrogen, and acetylene. Among the suggested fuels, gaseous fuels have shown excellent performance and lower emission than other fuels. Series
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