International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 05 | May 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2767 Performance and Emission Characteristics of Eucalyptus Oil and Gasoline Blend in Four Stroke Multi Cylinder SI Engine Adil Wazeer 1 , Upendra Singh Yadav 2 , Gaurav Singh 3, Vishwas Nagrath 4 1,3 School of Mechanical Engineering, Galgotias University, Greater Noida, India 2 Dept. of Mechanical Engineering, Lovely Professional University, Punjab, India 4 Dept. of Mechanical Engineering, Allenhouse Institute of Technology, Kanpur, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Numerous alternative fuel blends have been introduced in past and they gave really satisfying results. In this article eucalyptus oil which is a high octane biomass derived fuel is blended with petrol 15% by volume Eu15 and is used as fuel in four stroke multi cylinder petrol engine. The performance and emission characteristics of the engine were studied. The results demonstrates the reduction in consumption of fuel as the brake specific fuel consumption was found to decrease. The improvement in brake thermal efficiency is also witnessed. While the emission parameters were also improved, both HC and CO emissions significantly reduces as the load kept increasing. Key Words: Gasoline, Emission characteristics, Alternative fuel, SI Engine, BSFC, Brake Thermal Efficiency. 1. INTRODUCTION Many studies are going on for the enhancement of fuel economy of engines. There is an essential need of alternate fuels and improvement in its properties. Today intensive search for the alternative fuels for both spark ignition (SI) and compression ignition (CI) engines are carried out and it has been observed that the biomass derived fuels are suited for the application in alternate fuels. In spark ignition engines fuels like eucalyptus oil and orange oil are the suitable substituents for the petrol. They can be blended with petrol over a wide range of percentage according to the requirement. Another reason for the need of alternate fuels for IC engines is the emission problems. Combined with other air polluting factors, the large number of automobiles is a major contributor to the air quality problems of the world. As these fuels cannot be run directly in the engines therefore these are blended with gasoline at various percentage. One of the main reasons for selecting these fuels is the similarity in the properties of these with gasoline and they are miscible with gasoline without any phase separation. The engines used for these blending or for alternate fuels are modified engines which were originally designed for gasoline fuelling. The eucalyptus oil can be used in spark-ignition engines with very little engine modification as a blend with gasoline. Since the octane number of eucalyptus oil is more than gasoline, so it enhances the octane value of the fuel when it is blended with low octane gasoline. At the same time the compression ratio (CR) which is dependent on knock can be increased when these fuels are blended with gasoline. M. Senthil Kumar et al. [1], carried out experiment on the use of vegetables directly in compression ignition engines. Along with that small quantities of orange oil were inducted along with air and ignited after compression. Methyl ester of Jatropha oil and diesel were also used as fuels for comparing the results with that of the vegetable oil. Purushothaman K.et al. [2], studied about the performance, emission and combustion characteristics of a single cylinder, constant speed, direct injection diesel engine using orange oil as an alternate fuel and the results are compared with the standard diesel fuel operation. The results shows that the brake thermal efficiency is higher than that of diesel operation throughout the load variation. Poola R.B. et al. [3] carried out an experiment with 20% by volume of orange oil and eucalyptus oil were separately blended with gasoline brake thermal efficiency, exhaust emissions and combustion parameters were obtained. The experiment was conducted on small capacity 145.45 cc displacement volume, 4.3 KW at 5200 rpm, loop scavenged, air cooled, single cylinder, two stroke -ignition engines with a compression ratio of 7.4. It was found out that the performance of fuel blends was better than gasoline fuel. Experiment was performed on two compression ratios viz. 7.4 & 9 and improvement of 20.5% in brake thermal efficiency was obtained at 2 KW, 3000 rpm, over the normal gasoline engine. Along with this hydrocarbon and carbon monoxide emission were reduced. While comparing the two fuel blends eucalyptus oil blend provides the best results for brake thermal efficiency with low exhaust emissions. Devan P K. et al. [4], they worked on to find out the performance, emission and combustion characteristics of a DI diesel engine using poon oil-based fuels and poon oil and poon oil methyl ester are tested in blended forms They prepared the blend with 20% poon oil and 40% poon oil methyl ester separately with standard diesel. Results obtained showed the reduction of CO and HC emissions. 2. EXPERIMENTAL SETUP A Four stroke multi cylinder petrol engine is used for executing the performance and emission characteristics tests using Eu15 blend as fuel. The engine was coupled to an eddy current dynamometer (Vibrometer) for torque and speed measurements. A gas analyzer is used for measuring the emission parameters in the engine exhaust. Speed is kept to