IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 2 Ver. III (Mar - Apr. 2015), PP 62-68 www.iosrjournals.org DOI: 10.9790/1684-12236268 www.iosrjournals.org 62 | Page Parametric optimization of C.I. Engine for Brake Thermal Efficiency using Diesel-sesame blend Milan D. Trivedi 1 , Pragna R. Patel 2 , Tushar M. Patel 3 ,Gaurav P. Rathod 4 1 (M.E. Scholar, Dept. of Mechanical Engineering, KSV University,Gujarat,India) 2 (Associate Professor, Dept. of Mechanical Engineering, KSV University,Gujarat,India) 3 (Associate Professor, Dept. of Mechanical Engineering, KSV University,Gujarat,India) 4 (Assistant Professor, Dept. of Mechanical Engineering, KSV University,Gujarat,India) Abstract:The present problem of depleting crude oil can be solved by finding such alternative biodiesel, which gives better efficiency and reduce emissions. In this paper sesame seed is identified as an alternative source of energy, but has a problem of high viscosity so it cannot be used directly. This Diesel along with the sesame blend is used in the Single cylinder C.I. Engine and performance are evaluated. Taguchi Method for parametric optimization is used in this experiment. An optimum condition of Injection pressure and the blend is identified for maximum brake thermal efficiency. The result of Taguchi Method identified that maximum brake thermal efficiency is obtained when Diesel is blended with sesame in 10 % and operated at an injection pressure of 160 bar at 10kg load. Keywords:C.I. Engine, Parametric optimization, Sesame oil, Specific fuel consumption,Taguchi method. I. Introduction The depletion of crude oil and its harmful effect on the environment is the major problem in today’s age. The use of biodiesel engines is necessary in the recent years for energy efficient and environmentally friendly environment. The world is facing the problem of depletion of natural resources of fossil fuel and lead to degradation of the environment. There is an urgent need to explore new alternatives which reduces dependency on the export of oil. Many alternative fuels are recently discovered which are having potential to be used in diesel engines. Experts believe that by the year 2070, the world will be exhausted of fossil fuels. So there is an urgent need of replacing these fossil fuels with alternative fuels. Basically the major part of energy consumed worldwide comes from the fossil fuels (Petroleum, Coal, Natural gas) which are not only nonrenewable but also a major cause of atmospheric pollution. Meanwhile, alternative fuels are renewable and also address many issues like global warming and air pollution. This report discusses in a general and comparative aspects such as fuel properties, performance environmental effects and exhaust emissions. To deal with this issue a lot of research is going on for development of alternate fuel, which is compatible with the present engine system and to get lower emission than traditional fuel. Now days, India is importing more than 80% of its fuel demand and its spending a huge amount of foreign currency on fuel.” Biofuels” are produced from biomass such as trees, grasses, food processing waste, forestry and animal residue and municipal solid waste. Biodiesel has become more attractive recently because of its environmental benefits. II. Literature Review Shailaja et al did research on Performance Evaluation of a Diesel Engine with Sesame Oil Biodiesel and its Blends with Diesel. Blends used are B10, B20, B25, B30, B40 and the resultsshow that brake thermal efficiency and mechanical efficiency increase with increase in load, B25 and B60 give maximum brake thermal efficiency and mechanical efficiency respectively. Highest indicated thermal efficiency is obtained for B100 [1].ProfBhave et al in his paper entitled performance and emission of sesame oil methyl ester in compression ignition engine shown the result of his experiment performed by using sesame methyl ester prepared by transesterification process. Various blends of different proportions of Sesame Oil Methyl Ester (SOME) and diesel ranging from 20% to 100% were used to run this single cylinder engine. BSFC is found to decrease with increase in load. The specific fuel consumption of ester was generally higher than diesel, mainly due to low volatility and high fuel flow rates due to the high density of SOME [2]. Şehmus et al presented study of the comparison of engine performance and exhaust emission characteristics of sesame oil–diesel fuel mixture with diesel fuel in direct injection diesel engine which shows that the engine power and torque of the mixture of sesame oil–diesel fuel are close to the values obtained from diesel fuel and the amounts of exhaust emissions are lower than those of diesel fuel [3]. Banapurmath et al in his article performance and emission characteristics of a DI compression ignition engine operated on Honge, Jatrpoha and sesame oil methyl esters showed resultsthat Engine performance in terms of higher brake thermal efficiency and lower emissions (HC, CO, NO X ) with